diff --git a/exercises/acronym/canonical-data.json b/exercises/acronym/canonical-data.json
index b71c50c743..28cf5f58a0 100644
--- a/exercises/acronym/canonical-data.json
+++ b/exercises/acronym/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "Abbreviate a phrase",
       "cases": [
         {
+          "uuid": "1e22cceb-c5e4-4562-9afe-aef07ad1eaf4",
           "description": "basic",
           "property": "abbreviate",
           "input": {
@@ -14,6 +15,7 @@
           "expected": "PNG"
         },
         {
+          "uuid": "79ae3889-a5c0-4b01-baf0-232d31180c08",
           "description": "lowercase words",
           "property": "abbreviate",
           "input": {
@@ -22,6 +24,7 @@
           "expected": "ROR"
         },
         {
+          "uuid": "ec7000a7-3931-4a17-890e-33ca2073a548",
           "description": "punctuation",
           "property": "abbreviate",
           "input": {
@@ -30,6 +33,7 @@
           "expected": "FIFO"
         },
         {
+          "uuid": "32dd261c-0c92-469a-9c5c-b192e94a63b0",
           "description": "all caps word",
           "property": "abbreviate",
           "input": {
@@ -38,6 +42,7 @@
           "expected": "GIMP"
         },
         {
+          "uuid": "ae2ac9fa-a606-4d05-8244-3bcc4659c1d4",
           "description": "punctuation without whitespace",
           "property": "abbreviate",
           "input": {
@@ -46,6 +51,7 @@
           "expected": "CMOS"
         },
         {
+          "uuid": "0e4b1e7c-1a6d-48fb-81a7-bf65eb9e69f9",
           "description": "very long abbreviation",
           "property": "abbreviate",
           "input": {
@@ -54,6 +60,7 @@
           "expected": "ROTFLSHTMDCOALM"
         },
         {
+          "uuid": "6a078f49-c68d-4b7b-89af-33a1a98c28cc",
           "description": "consecutive delimiters",
           "property": "abbreviate",
           "input": {
@@ -62,6 +69,7 @@
           "expected": "SIMUFTA"
         },
         {
+          "uuid": "5118b4b1-4572-434c-8d57-5b762e57973e",
           "description": "apostrophes",
           "property": "abbreviate",
           "input": {
@@ -70,6 +78,7 @@
           "expected": "HC"
         },
         {
+          "uuid": "adc12eab-ec2d-414f-b48c-66a4fc06cdef",
           "description": "underscore emphasis",
           "property": "abbreviate",
           "input": {
diff --git a/exercises/affine-cipher/canonical-data.json b/exercises/affine-cipher/canonical-data.json
index 0c17044d98..b6e2ade464 100644
--- a/exercises/affine-cipher/canonical-data.json
+++ b/exercises/affine-cipher/canonical-data.json
@@ -12,6 +12,7 @@
       "comments": [ "Test encoding from English to ciphertext with keys" ],
       "cases": [
         {
+          "uuid": "2ee1d9af-1c43-416c-b41b-cefd7d4d2b2a",
           "description": "encode yes",
           "property": "encode",
           "input": {
@@ -24,6 +25,7 @@
           "expected": "xbt"
         },
         {
+          "uuid": "785bade9-e98b-4d4f-a5b0-087ba3d7de4b",
           "description": "encode no",
           "property": "encode",
           "input": {
@@ -36,6 +38,7 @@
           "expected": "fu"
         },
         {
+          "uuid": "2854851c-48fb-40d8-9bf6-8f192ed25054",
           "description": "encode OMG",
           "property": "encode",
           "input": {
@@ -48,6 +51,7 @@
           "expected": "lvz"
         },
         {
+          "uuid": "bc0c1244-b544-49dd-9777-13a770be1bad",
           "description": "encode O M G",
           "property": "encode",
           "input": {
@@ -60,6 +64,7 @@
           "expected": "hjp"
         },
         {
+          "uuid": "381a1a20-b74a-46ce-9277-3778625c9e27",
           "description": "encode mindblowingly",
           "property": "encode",
           "input": {
@@ -72,6 +77,7 @@
           "expected": "rzcwa gnxzc dgt"
         },
         {
+          "uuid": "6686f4e2-753b-47d4-9715-876fdc59029d",
           "description": "encode numbers",
           "property": "encode",
           "input": {
@@ -84,6 +90,7 @@
           "expected": "jqgjc rw123 jqgjc rw"
         },
         {
+          "uuid": "ae23d5bd-30a8-44b6-afbe-23c8c0c7faa3",
           "description": "encode deep thought",
           "property": "encode",
           "input": {
@@ -96,6 +103,7 @@
           "expected": "iynia fdqfb ifje"
         },
         {
+          "uuid": "c93a8a4d-426c-42ef-9610-76ded6f7ef57",
           "description": "encode all the letters",
           "property": "encode",
           "input": {
@@ -108,6 +116,7 @@
           "expected": "swxtj npvyk lruol iejdc blaxk swxmh qzglf"
         },
         {
+          "uuid": "0673638a-4375-40bd-871c-fb6a2c28effb",
           "description": "encode with a not coprime to m",
           "property": "encode",
           "input": {
@@ -126,6 +135,7 @@
       "comments": [ "Test decoding from ciphertext to English with keys" ],
       "cases": [
         {
+          "uuid": "3f0ac7e2-ec0e-4a79-949e-95e414953438",
           "description": "decode exercism",
           "property": "decode",
           "input": {
@@ -138,6 +148,7 @@
           "expected": "exercism"
         },
         {
+          "uuid": "241ee64d-5a47-4092-a5d7-7939d259e077",
           "description": "decode a sentence",
           "property": "decode",
           "input": {
@@ -150,6 +161,7 @@
           "expected": "anobstacleisoftenasteppingstone"
         },
         {
+          "uuid": "33fb16a1-765a-496f-907f-12e644837f5e",
           "description": "decode numbers",
           "property": "decode",
           "input": {
@@ -162,6 +174,7 @@
           "expected": "testing123testing"
         },
         {
+          "uuid": "20bc9dce-c5ec-4db6-a3f1-845c776bcbf7",
           "description": "decode all the letters",
           "property": "decode",
           "input": {
@@ -174,6 +187,7 @@
           "expected": "thequickbrownfoxjumpsoverthelazydog"
         },
         {
+          "uuid": "623e78c0-922d-49c5-8702-227a3e8eaf81",
           "description": "decode with no spaces in input",
           "property": "decode",
           "input": {
@@ -186,6 +200,7 @@
           "expected": "thequickbrownfoxjumpsoverthelazydog"
         },
         {
+          "uuid": "58fd5c2a-1fd9-4563-a80a-71cff200f26f",
           "description": "decode with too many spaces",
           "property": "decode",
           "input": {
@@ -198,6 +213,7 @@
           "expected": "jollygreengiant"
         },
         {
+          "uuid": "b004626f-c186-4af9-a3f4-58f74cdb86d5",
           "description": "decode with a not coprime to m",
           "property": "decode",
           "input": {
diff --git a/exercises/all-your-base/canonical-data.json b/exercises/all-your-base/canonical-data.json
index b998618d35..86249d02fa 100644
--- a/exercises/all-your-base/canonical-data.json
+++ b/exercises/all-your-base/canonical-data.json
@@ -14,6 +14,7 @@
   ],
   "cases": [
     {
+      "uuid": "5ce422f9-7a4b-4f44-ad29-49c67cb32d2c",
       "description": "single bit one to decimal",
       "property": "rebase",
       "input": {
@@ -24,6 +25,7 @@
       "expected": [1]
     },
     {
+      "uuid": "0cc3fea8-bb79-46ac-a2ab-5a2c93051033",
       "description": "binary to single decimal",
       "property": "rebase",
       "input": {
@@ -34,6 +36,7 @@
       "expected": [5]
     },
     {
+      "uuid": "f12db0f9-0d3d-42c2-b3ba-e38cb375a2b8",
       "description": "single decimal to binary",
       "property": "rebase",
       "input": {
@@ -44,6 +47,7 @@
       "expected": [1, 0, 1]
     },
     {
+      "uuid": "2c45cf54-6da3-4748-9733-5a3c765d925b",
       "description": "binary to multiple decimal",
       "property": "rebase",
       "input": {
@@ -54,6 +58,7 @@
       "expected": [4, 2]
     },
     {
+      "uuid": "65ddb8b4-8899-4fcc-8618-181b2cf0002d",
       "description": "decimal to binary",
       "property": "rebase",
       "input": {
@@ -64,6 +69,7 @@
       "expected": [1, 0, 1, 0, 1, 0]
     },
     {
+      "uuid": "8d418419-02a7-4824-8b7a-352d33c6987e",
       "description": "trinary to hexadecimal",
       "property": "rebase",
       "input": {
@@ -74,6 +80,7 @@
       "expected": [2, 10]
     },
     {
+      "uuid": "d3901c80-8190-41b9-bd86-38d988efa956",
       "description": "hexadecimal to trinary",
       "property": "rebase",
       "input": {
@@ -84,6 +91,7 @@
       "expected": [1, 1, 2, 0]
     },
     {
+      "uuid": "5d42f85e-21ad-41bd-b9be-a3e8e4258bbf",
       "description": "15-bit integer",
       "property": "rebase",
       "input": {
@@ -94,6 +102,7 @@
       "expected": [6, 10, 45]
     },
     {
+      "uuid": "d68788f7-66dd-43f8-a543-f15b6d233f83",
       "description": "empty list",
       "property": "rebase",
       "input": {
@@ -104,6 +113,7 @@
       "expected": [0]
     },
     {
+      "uuid": "5e27e8da-5862-4c5f-b2a9-26c0382b6be7",
       "description": "single zero",
       "property": "rebase",
       "input": {
@@ -114,6 +124,7 @@
       "expected": [0]
     },
     {
+      "uuid": "2e1c2573-77e4-4b9c-8517-6c56c5bcfdf2",
       "description": "multiple zeros",
       "property": "rebase",
       "input": {
@@ -124,6 +135,7 @@
       "expected": [0]
     },
     {
+      "uuid": "3530cd9f-8d6d-43f5-bc6e-b30b1db9629b",
       "description": "leading zeros",
       "property": "rebase",
       "input": {
@@ -134,6 +146,7 @@
       "expected": [4, 2]
     },
     {
+      "uuid": "a6b476a1-1901-4f2a-92c4-4d91917ae023",
       "description": "input base is one",
       "property": "rebase",
       "input": {
@@ -144,6 +157,7 @@
       "expected": {"error": "input base must be >= 2"}
     },
     {
+      "uuid": "e21a693a-7a69-450b-b393-27415c26a016",
       "description": "input base is zero",
       "property": "rebase",
       "input": {
@@ -154,6 +168,7 @@
       "expected": {"error": "input base must be >= 2"}
     },
     {
+      "uuid": "54a23be5-d99e-41cc-88e0-a650ffe5fcc2",
       "description": "input base is negative",
       "property": "rebase",
       "input": {
@@ -164,6 +179,7 @@
       "expected": {"error": "input base must be >= 2"}
     },
     {
+      "uuid": "9eccf60c-dcc9-407b-95d8-c37b8be56bb6",
       "description": "negative digit",
       "property": "rebase",
       "input": {
@@ -174,6 +190,7 @@
       "expected": {"error": "all digits must satisfy 0 <= d < input base"}
     },
     {
+      "uuid": "232fa4a5-e761-4939-ba0c-ed046cd0676a",
       "description": "invalid positive digit",
       "property": "rebase",
       "input": {
@@ -184,6 +201,7 @@
       "expected": {"error": "all digits must satisfy 0 <= d < input base"}
     },
     {
+      "uuid": "14238f95-45da-41dc-95ce-18f860b30ad3",
       "description": "output base is one",
       "property": "rebase",
       "input": {
@@ -194,6 +212,7 @@
       "expected": {"error": "output base must be >= 2"}
     },
     {
+      "uuid": "73dac367-da5c-4a37-95fe-c87fad0a4047",
       "description": "output base is zero",
       "property": "rebase",
       "input": {
@@ -204,6 +223,7 @@
       "expected": {"error": "output base must be >= 2"}
     },
     {
+      "uuid": "13f81f42-ff53-4e24-89d9-37603a48ebd9",
       "description": "output base is negative",
       "property": "rebase",
       "input": {
@@ -214,6 +234,7 @@
       "expected": {"error": "output base must be >= 2"}
     },
     {
+      "uuid": "0e6c895d-8a5d-4868-a345-309d094cfe8d",
       "description": "both bases are negative",
       "property": "rebase",
       "input": {
diff --git a/exercises/allergies/canonical-data.json b/exercises/allergies/canonical-data.json
index 16e600b483..465052136e 100644
--- a/exercises/allergies/canonical-data.json
+++ b/exercises/allergies/canonical-data.json
@@ -10,6 +10,7 @@
       "description": "testing for eggs allergy",
       "cases": [
         {
+          "uuid": "17fc7296-2440-4ac4-ad7b-d07c321bc5a0",
           "description": "not allergic to anything",
           "property": "allergicTo",
           "input": {
@@ -19,6 +20,7 @@
           "expected": false
         },
         {
+          "uuid": "07ced27b-1da5-4c2e-8ae2-cb2791437546",
           "description": "allergic only to eggs",
           "property": "allergicTo",
           "input": {
@@ -28,6 +30,7 @@
           "expected": true
         },
         {
+          "uuid": "5035b954-b6fa-4b9b-a487-dae69d8c5f96",
           "description": "allergic to eggs and something else",
           "property": "allergicTo",
           "input": {
@@ -37,6 +40,7 @@
           "expected": true
         },
         {
+          "uuid": "64a6a83a-5723-4b5b-a896-663307403310",
           "description": "allergic to something, but not eggs",
           "property": "allergicTo",
           "input": {
@@ -46,6 +50,7 @@
           "expected": false
         },
         {
+          "uuid": "90c8f484-456b-41c4-82ba-2d08d93231c6",
           "description": "allergic to everything",
           "property": "allergicTo",
           "input": {
@@ -60,6 +65,7 @@
       "description": "testing for peanuts allergy",
       "cases": [
         {
+          "uuid": "d266a59a-fccc-413b-ac53-d57cb1f0db9d",
           "description": "not allergic to anything",
           "property": "allergicTo",
           "input": {
@@ -69,6 +75,7 @@
           "expected": false
         },
         {
+          "uuid": "ea210a98-860d-46b2-a5bf-50d8995b3f2a",
           "description": "allergic only to peanuts",
           "property": "allergicTo",
           "input": {
@@ -78,6 +85,7 @@
           "expected": true
         },
         {
+          "uuid": "eac69ae9-8d14-4291-ac4b-7fd2c73d3a5b",
           "description": "allergic to peanuts and something else",
           "property": "allergicTo",
           "input": {
@@ -87,6 +95,7 @@
           "expected": true
         },
         {
+          "uuid": "9152058c-ce39-4b16-9b1d-283ec6d25085",
           "description": "allergic to something, but not peanuts",
           "property": "allergicTo",
           "input": {
@@ -96,6 +105,7 @@
           "expected": false
         },
         {
+          "uuid": "d2d71fd8-63d5-40f9-a627-fbdaf88caeab",
           "description": "allergic to everything",
           "property": "allergicTo",
           "input": {
@@ -110,6 +120,7 @@
       "description": "testing for shellfish allergy",
       "cases": [
         {
+          "uuid": "b948b0a1-cbf7-4b28-a244-73ff56687c80",
           "description": "not allergic to anything",
           "property": "allergicTo",
           "input": {
@@ -119,6 +130,7 @@
           "expected": false
         },
         {
+          "uuid": "9ce9a6f3-53e9-4923-85e0-73019047c567",
           "description": "allergic only to shellfish",
           "property": "allergicTo",
           "input": {
@@ -128,6 +140,7 @@
           "expected": true
         },
         {
+          "uuid": "b272fca5-57ba-4b00-bd0c-43a737ab2131",
           "description": "allergic to shellfish and something else",
           "property": "allergicTo",
           "input": {
@@ -137,6 +150,7 @@
           "expected": true
         },
         {
+          "uuid": "21ef8e17-c227-494e-8e78-470a1c59c3d8",
           "description": "allergic to something, but not shellfish",
           "property": "allergicTo",
           "input": {
@@ -146,6 +160,7 @@
           "expected": false
         },
         {
+          "uuid": "cc789c19-2b5e-4c67-b146-625dc8cfa34e",
           "description": "allergic to everything",
           "property": "allergicTo",
           "input": {
@@ -160,6 +175,7 @@
       "description": "testing for strawberries allergy",
       "cases": [
         {
+          "uuid": "651bde0a-2a74-46c4-ab55-02a0906ca2f5",
           "description": "not allergic to anything",
           "property": "allergicTo",
           "input": {
@@ -169,6 +185,7 @@
           "expected": false
         },
         {
+          "uuid": "b649a750-9703-4f5f-b7f7-91da2c160ece",
           "description": "allergic only to strawberries",
           "property": "allergicTo",
           "input": {
@@ -178,6 +195,7 @@
           "expected": true
         },
         {
+          "uuid": "50f5f8f3-3bac-47e6-8dba-2d94470a4bc6",
           "description": "allergic to strawberries and something else",
           "property": "allergicTo",
           "input": {
@@ -187,6 +205,7 @@
           "expected": true
         },
         {
+          "uuid": "23dd6952-88c9-48d7-a7d5-5d0343deb18d",
           "description": "allergic to something, but not strawberries",
           "property": "allergicTo",
           "input": {
@@ -196,6 +215,7 @@
           "expected": false
         },
         {
+          "uuid": "74afaae2-13b6-43a2-837a-286cd42e7d7e",
           "description": "allergic to everything",
           "property": "allergicTo",
           "input": {
@@ -210,6 +230,7 @@
       "description": "testing for tomatoes allergy",
       "cases": [
         {
+          "uuid": "c49a91ef-6252-415e-907e-a9d26ef61723",
           "description": "not allergic to anything",
           "property": "allergicTo",
           "input": {
@@ -219,6 +240,7 @@
           "expected": false
         },
         {
+          "uuid": "b69c5131-b7d0-41ad-a32c-e1b2cc632df8",
           "description": "allergic only to tomatoes",
           "property": "allergicTo",
           "input": {
@@ -228,6 +250,7 @@
           "expected": true
         },
         {
+          "uuid": "1ca50eb1-f042-4ccf-9050-341521b929ec",
           "description": "allergic to tomatoes and something else",
           "property": "allergicTo",
           "input": {
@@ -237,6 +260,7 @@
           "expected": true
         },
         {
+          "uuid": "e9846baa-456b-4eff-8025-034b9f77bd8e",
           "description": "allergic to something, but not tomatoes",
           "property": "allergicTo",
           "input": {
@@ -246,6 +270,7 @@
           "expected": false
         },
         {
+          "uuid": "b2414f01-f3ad-4965-8391-e65f54dad35f",
           "description": "allergic to everything",
           "property": "allergicTo",
           "input": {
@@ -260,6 +285,7 @@
       "description": "testing for chocolate allergy",
       "cases": [
         {
+          "uuid": "978467ab-bda4-49f7-b004-1d011ead947c",
           "description": "not allergic to anything",
           "property": "allergicTo",
           "input": {
@@ -269,6 +295,7 @@
           "expected": false
         },
         {
+          "uuid": "59cf4e49-06ea-4139-a2c1-d7aad28f8cbc",
           "description": "allergic only to chocolate",
           "property": "allergicTo",
           "input": {
@@ -278,6 +305,7 @@
           "expected": true
         },
         {
+          "uuid": "b0a7c07b-2db7-4f73-a180-565e07040ef1",
           "description": "allergic to chocolate and something else",
           "property": "allergicTo",
           "input": {
@@ -287,6 +315,7 @@
           "expected": true
         },
         {
+          "uuid": "f5506893-f1ae-482a-b516-7532ba5ca9d2",
           "description": "allergic to something, but not chocolate",
           "property": "allergicTo",
           "input": {
@@ -296,6 +325,7 @@
           "expected": false
         },
         {
+          "uuid": "02debb3d-d7e2-4376-a26b-3c974b6595c6",
           "description": "allergic to everything",
           "property": "allergicTo",
           "input": {
@@ -310,6 +340,7 @@
       "description": "testing for pollen allergy",
       "cases": [
         {
+          "uuid": "17f4a42b-c91e-41b8-8a76-4797886c2d96",
           "description": "not allergic to anything",
           "property": "allergicTo",
           "input": {
@@ -319,6 +350,7 @@
           "expected": false
         },
         {
+          "uuid": "7696eba7-1837-4488-882a-14b7b4e3e399",
           "description": "allergic only to pollen",
           "property": "allergicTo",
           "input": {
@@ -328,6 +360,7 @@
           "expected": true
         },
         {
+          "uuid": "9a49aec5-fa1f-405d-889e-4dfc420db2b6",
           "description": "allergic to pollen and something else",
           "property": "allergicTo",
           "input": {
@@ -337,6 +370,7 @@
           "expected": true
         },
         {
+          "uuid": "3cb8e79f-d108-4712-b620-aa146b1954a9",
           "description": "allergic to something, but not pollen",
           "property": "allergicTo",
           "input": {
@@ -346,6 +380,7 @@
           "expected": false
         },
         {
+          "uuid": "1dc3fe57-7c68-4043-9d51-5457128744b2",
           "description": "allergic to everything",
           "property": "allergicTo",
           "input": {
@@ -360,6 +395,7 @@
       "description": "testing for cats allergy",
       "cases": [
         {
+          "uuid": "d3f523d6-3d50-419b-a222-d4dfd62ce314",
           "description": "not allergic to anything",
           "property": "allergicTo",
           "input": {
@@ -369,6 +405,7 @@
           "expected": false
         },
         {
+          "uuid": "eba541c3-c886-42d3-baef-c048cb7fcd8f",
           "description": "allergic only to cats",
           "property": "allergicTo",
           "input": {
@@ -378,6 +415,7 @@
           "expected": true
         },
         {
+          "uuid": "ba718376-26e0-40b7-bbbe-060287637ea5",
           "description": "allergic to cats and something else",
           "property": "allergicTo",
           "input": {
@@ -387,6 +425,7 @@
           "expected": true
         },
         {
+          "uuid": "3c6dbf4a-5277-436f-8b88-15a206f2d6c4",
           "description": "allergic to something, but not cats",
           "property": "allergicTo",
           "input": {
@@ -396,6 +435,7 @@
           "expected": false
         },
         {
+          "uuid": "1faabb05-2b98-4995-9046-d83e4a48a7c1",
           "description": "allergic to everything",
           "property": "allergicTo",
           "input": {
@@ -413,6 +453,7 @@
       ],
       "cases": [
         {
+          "uuid": "f9c1b8e7-7dc5-4887-aa93-cebdcc29dd8f",
           "description": "no allergies",
           "property": "list",
           "input": {
@@ -421,6 +462,7 @@
           "expected": []
         },
         {
+          "uuid": "9e1a4364-09a6-4d94-990f-541a94a4c1e8",
           "description": "just eggs",
           "property": "list",
           "input": {
@@ -431,6 +473,7 @@
           ]
         },
         {
+          "uuid": "8851c973-805e-4283-9e01-d0c0da0e4695",
           "description": "just peanuts",
           "property": "list",
           "input": {
@@ -441,6 +484,7 @@
           ]
         },
         {
+          "uuid": "2c8943cb-005e-435f-ae11-3e8fb558ea98",
           "description": "just strawberries",
           "property": "list",
           "input": {
@@ -451,6 +495,7 @@
           ]
         },
         {
+          "uuid": "6fa95d26-044c-48a9-8a7b-9ee46ec32c5c",
           "description": "eggs and peanuts",
           "property": "list",
           "input": {
@@ -462,6 +507,7 @@
           ]
         },
         {
+          "uuid": "19890e22-f63f-4c5c-a9fb-fb6eacddfe8e",
           "description": "more than eggs but not peanuts",
           "property": "list",
           "input": {
@@ -473,6 +519,7 @@
           ]
         },
         {
+          "uuid": "4b68f470-067c-44e4-889f-c9fe28917d2f",
           "description": "lots of stuff",
           "property": "list",
           "input": {
@@ -487,6 +534,7 @@
           ]
         },
         {
+          "uuid": "0881b7c5-9efa-4530-91bd-68370d054bc7",
           "description": "everything",
           "property": "list",
           "input": {
@@ -504,6 +552,7 @@
           ]
         },
         {
+          "uuid": "12ce86de-b347-42a0-ab7c-2e0570f0c65b",
           "description": "no allergen score parts",
           "property": "list",
           "input": {
diff --git a/exercises/alphametics/canonical-data.json b/exercises/alphametics/canonical-data.json
index 4ccff5cf4b..ddf122eec4 100644
--- a/exercises/alphametics/canonical-data.json
+++ b/exercises/alphametics/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "Solve the alphametics puzzle",
       "cases": [
         {
+          "uuid": "e0c08b07-9028-4d5f-91e1-d178fead8e1a",
           "description": "puzzle with three letters",
           "property": "solve",
           "input": {
@@ -18,6 +19,7 @@
           }
         },
         {
+          "uuid": "a504ee41-cb92-4ec2-9f11-c37e95ab3f25",
           "description": "solution must have unique value for each letter",
           "property": "solve",
           "input": {
@@ -26,6 +28,7 @@
           "expected": null
         },
         {
+          "uuid": "4e3b81d2-be7b-4c5c-9a80-cd72bc6d465a",
           "description": "leading zero solution is invalid",
           "property": "solve",
           "input": {
@@ -34,6 +37,7 @@
           "expected": null
         },
         {
+          "uuid": "8a3e3168-d1ee-4df7-94c7-b9c54845ac3a",
           "description": "puzzle with two digits final carry",
           "property": "solve",
           "input": {
@@ -46,6 +50,7 @@
           }
         },
         {
+          "uuid": "a9630645-15bd-48b6-a61e-d85c4021cc09",
           "description": "puzzle with four letters",
           "property": "solve",
           "input": {
@@ -59,6 +64,7 @@
           }
         },
         {
+          "uuid": "3d905a86-5a52-4e4e-bf80-8951535791bd",
           "description": "puzzle with six letters",
           "property": "solve",
           "input": {
@@ -74,6 +80,7 @@
           }
         },
         {
+          "uuid": "4febca56-e7b7-4789-97b9-530d09ba95f0",
           "description": "puzzle with seven letters",
           "property": "solve",
           "input": {
@@ -90,6 +97,7 @@
           }
         },
         {
+          "uuid": "12125a75-7284-4f9a-a5fa-191471e0d44f",
           "description": "puzzle with eight letters",
           "property": "solve",
           "input": {
@@ -107,6 +115,7 @@
           }
         },
         {
+          "uuid": "fb05955f-38dc-477a-a0b6-5ef78969fffa",
           "description": "puzzle with ten letters",
           "property": "solve",
           "input": {
@@ -126,6 +135,7 @@
           }
         },
         {
+          "uuid": "9a101e81-9216-472b-b458-b513a7adacf7",
           "description": "puzzle with ten letters and 199 addends",
           "property": "solve",
           "input": {
diff --git a/exercises/anagram/canonical-data.json b/exercises/anagram/canonical-data.json
index 829daf9298..e4ee08dc77 100644
--- a/exercises/anagram/canonical-data.json
+++ b/exercises/anagram/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.5.0",
   "cases": [
     {
+      "uuid": "dd40c4d2-3c8b-44e5-992a-f42b393ec373",
       "description": "no matches",
       "property": "findAnagrams",
       "input": {
@@ -12,6 +13,7 @@
       "expected": []
     },
     {
+      "uuid": "b3cca662-f50a-489e-ae10-ab8290a09bdc",
       "description": "detects two anagrams",
       "property": "findAnagrams",
       "input": {
@@ -21,6 +23,7 @@
       "expected": ["stream", "maters"]
     },
     {
+      "uuid": "a27558ee-9ba0-4552-96b1-ecf665b06556",
       "description": "does not detect anagram subsets",
       "property": "findAnagrams",
       "input": {
@@ -30,6 +33,7 @@
       "expected": []
     },
     {
+      "uuid": "64cd4584-fc15-4781-b633-3d814c4941a4",
       "description": "detects anagram",
       "property": "findAnagrams",
       "input": {
@@ -39,6 +43,7 @@
       "expected": ["inlets"]
     },
     {
+      "uuid": "99c91beb-838f-4ccd-b123-935139917283",
       "description": "detects three anagrams",
       "property": "findAnagrams",
       "input": {
@@ -55,6 +60,7 @@
       "expected": ["gallery", "regally", "largely"]
     },
     {
+      "uuid": "78487770-e258-4e1f-a646-8ece10950d90",
       "description": "detects multiple anagrams with different case",
       "property": "findAnagrams",
       "input": {
@@ -64,6 +70,7 @@
       "expected": ["Eons", "ONES"]
     },
     {
+      "uuid": "1d0ab8aa-362f-49b7-9902-3d0c668d557b",
       "description": "does not detect non-anagrams with identical checksum",
       "property": "findAnagrams",
       "input": {
@@ -73,6 +80,7 @@
       "expected": []
     },
     {
+      "uuid": "9e632c0b-c0b1-4804-8cc1-e295dea6d8a8",
       "description": "detects anagrams case-insensitively",
       "property": "findAnagrams",
       "input": {
@@ -82,6 +90,7 @@
       "expected": ["Carthorse"]
     },
     {
+      "uuid": "b248e49f-0905-48d2-9c8d-bd02d8c3e392",
       "description": "detects anagrams using case-insensitive subject",
       "property": "findAnagrams",
       "input": {
@@ -91,6 +100,7 @@
       "expected": ["carthorse"]
     },
     {
+      "uuid": "f367325c-78ec-411c-be76-e79047f4bd54",
       "description": "detects anagrams using case-insensitive possible matches",
       "property": "findAnagrams",
       "input": {
@@ -100,6 +110,7 @@
       "expected": ["Carthorse"]
     },
     {
+      "uuid": "7cc195ad-e3c7-44ee-9fd2-d3c344806a2c",
       "description": "does not detect an anagram if the original word is repeated",
       "property": "findAnagrams",
       "input": {
@@ -109,6 +120,7 @@
       "expected": []
     },
     {
+      "uuid": "9878a1c9-d6ea-4235-ae51-3ea2befd6842",
       "description": "anagrams must use all letters exactly once",
       "property": "findAnagrams",
       "input": {
@@ -118,6 +130,7 @@
       "expected": []
     },
     {
+      "uuid": "85757361-4535-45fd-ac0e-3810d40debc1",
       "description": "words are not anagrams of themselves (case-insensitive)",
       "property": "findAnagrams",
       "input": {
@@ -127,6 +140,7 @@
       "expected": []
     },
     {
+      "uuid": "a0705568-628c-4b55-9798-82e4acde51ca",
       "description": "words other than themselves can be anagrams",
       "property": "findAnagrams",
       "input": {
diff --git a/exercises/armstrong-numbers/canonical-data.json b/exercises/armstrong-numbers/canonical-data.json
index ef8df7f46c..2d3d325de3 100644
--- a/exercises/armstrong-numbers/canonical-data.json
+++ b/exercises/armstrong-numbers/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "c1ed103c-258d-45b2-be73-d8c6d9580c7b",
       "description": "Zero is an Armstrong number",
       "property": "isArmstrongNumber",
       "input": {
@@ -11,6 +12,7 @@
       "expected": true
     },
     {
+      "uuid": "579e8f03-9659-4b85-a1a2-d64350f6b17a",
       "description": "Single digit numbers are Armstrong numbers",
       "property": "isArmstrongNumber",
       "input": {
@@ -19,6 +21,7 @@
       "expected": true
     },
     {
+      "uuid": "2d6db9dc-5bf8-4976-a90b-b2c2b9feba60",
       "description": "There are no 2 digit Armstrong numbers",
       "property": "isArmstrongNumber",
       "input": {
@@ -27,6 +30,7 @@
       "expected": false
     },
     {
+      "uuid": "509c087f-e327-4113-a7d2-26a4e9d18283",
       "description": "Three digit number that is an Armstrong number",
       "property": "isArmstrongNumber",
       "input": {
@@ -35,6 +39,7 @@
       "expected": true
     },
     {
+      "uuid": "7154547d-c2ce-468d-b214-4cb953b870cf",
       "description": "Three digit number that is not an Armstrong number",
       "property": "isArmstrongNumber",
       "input": {
@@ -43,6 +48,7 @@
       "expected": false
     },
     {
+      "uuid": "6bac5b7b-42e9-4ecb-a8b0-4832229aa103",
       "description": "Four digit number that is an Armstrong number",
       "property": "isArmstrongNumber",
       "input": {
@@ -51,6 +57,7 @@
       "expected": true
     },
     {
+      "uuid": "eed4b331-af80-45b5-a80b-19c9ea444b2e",
       "description": "Four digit number that is not an Armstrong number",
       "property": "isArmstrongNumber",
       "input": {
@@ -59,6 +66,7 @@
       "expected": false
     },
     {
+      "uuid": "f971ced7-8d68-4758-aea1-d4194900b864",
       "description": "Seven digit number that is an Armstrong number",
       "property": "isArmstrongNumber",
       "input": {
@@ -67,6 +75,7 @@
       "expected": true
     },
     {
+      "uuid": "7ee45d52-5d35-4fbd-b6f1-5c8cd8a67f18",
       "description": "Seven digit number that is not an Armstrong number",
       "property": "isArmstrongNumber",
       "input": {
diff --git a/exercises/atbash-cipher/canonical-data.json b/exercises/atbash-cipher/canonical-data.json
index 399956c8d3..e0b55b3c44 100644
--- a/exercises/atbash-cipher/canonical-data.json
+++ b/exercises/atbash-cipher/canonical-data.json
@@ -12,6 +12,7 @@
       "comments": [ "Test encoding from English to atbash" ],
       "cases": [
         {
+          "uuid": "2f47ebe1-eab9-4d6b-b3c6-627562a31c77",
           "description": "encode yes",
           "property": "encode",
           "input": {
@@ -20,6 +21,7 @@
           "expected": "bvh"
         },
         {
+          "uuid": "b4ffe781-ea81-4b74-b268-cc58ba21c739",
           "description": "encode no",
           "property": "encode",
           "input": {
@@ -28,6 +30,7 @@
           "expected": "ml"
         },
         {
+          "uuid": "10e48927-24ab-4c4d-9d3f-3067724ace00",
           "description": "encode OMG",
           "property": "encode",
           "input": {
@@ -36,6 +39,7 @@
           "expected": "lnt"
         },
         {
+          "uuid": "d59b8bc3-509a-4a9a-834c-6f501b98750b",
           "description": "encode spaces",
           "property": "encode",
           "input": {
@@ -44,6 +48,7 @@
           "expected": "lnt"
         },
         {
+          "uuid": "31d44b11-81b7-4a94-8b43-4af6a2449429",
           "description": "encode mindblowingly",
           "property": "encode",
           "input": {
@@ -52,6 +57,7 @@
           "expected": "nrmwy oldrm tob"
         },
         {
+          "uuid": "d503361a-1433-48c0-aae0-d41b5baa33ff",
           "description": "encode numbers",
           "property": "encode",
           "input": {
@@ -60,6 +66,7 @@
           "expected": "gvhgr mt123 gvhgr mt"
         },
         {
+          "uuid": "79c8a2d5-0772-42d4-b41b-531d0b5da926",
           "description": "encode deep thought",
           "property": "encode",
           "input": {
@@ -68,6 +75,7 @@
           "expected": "gifgs rhurx grlm"
         },
         {
+          "uuid": "9ca13d23-d32a-4967-a1fd-6100b8742bab",
           "description": "encode all the letters",
           "property": "encode",
           "input": {
@@ -82,6 +90,7 @@
       "comments": [ "Test decoding from atbash to English" ],
       "cases": [
         {
+          "uuid": "bb50e087-7fdf-48e7-9223-284fe7e69851",
           "description": "decode exercism",
           "property": "decode",
           "input": {
@@ -90,6 +99,7 @@
           "expected": "exercism"
         },
         {
+          "uuid": "ac021097-cd5d-4717-8907-b0814b9e292c",
           "description": "decode a sentence",
           "property": "decode",
           "input": {
@@ -98,6 +108,7 @@
           "expected": "anobstacleisoftenasteppingstone"
         },
         {
+          "uuid": "18729de3-de74-49b8-b68c-025eaf77f851",
           "description": "decode numbers",
           "property": "decode",
           "input": {
@@ -106,6 +117,7 @@
           "expected": "testing123testing"
         },
         {
+          "uuid": "0f30325f-f53b-415d-ad3e-a7a4f63de034",
           "description": "decode all the letters",
           "property": "decode",
           "input": {
@@ -114,6 +126,7 @@
           "expected": "thequickbrownfoxjumpsoverthelazydog"
         },
         {
+          "uuid": "39640287-30c6-4c8c-9bac-9d613d1a5674",
           "description": "decode with too many spaces",
           "property": "decode",
           "input": {
@@ -122,6 +135,7 @@
           "expected": "exercism"
         },
         {
+          "uuid": "b34edf13-34c0-49b5-aa21-0768928000d5",
           "description": "decode with no spaces",
           "property": "decode",
           "input": {
diff --git a/exercises/beer-song/canonical-data.json b/exercises/beer-song/canonical-data.json
index ded745ed19..563d8cfeb7 100644
--- a/exercises/beer-song/canonical-data.json
+++ b/exercises/beer-song/canonical-data.json
@@ -9,6 +9,7 @@
           "description": "single verse",
           "cases": [
             {
+              "uuid": "5a02fd08-d336-4607-8006-246fe6fa9fb0",
               "description": "first generic verse",
               "property": "recite",
               "input": {
@@ -21,6 +22,7 @@
               ]
             },
             {
+              "uuid": "77299ca6-545e-4217-a9cc-606b342e0187",
               "description": "last generic verse",
               "property": "recite",
               "input": {
@@ -33,6 +35,7 @@
               ]
             },
             {
+              "uuid": "102cbca0-b197-40fd-b548-e99609b06428",
               "description": "verse with 2 bottles",
               "property": "recite",
               "input": {
@@ -45,6 +48,7 @@
               ]
             },
             {
+              "uuid": "b8ef9fce-960e-4d85-a0c9-980a04ec1972",
               "description": "verse with 1 bottle",
               "property": "recite",
               "input": {
@@ -57,6 +61,7 @@
               ]
             },
             {
+              "uuid": "c59d4076-f671-4ee3-baaa-d4966801f90d",
               "description": "verse with 0 bottles",
               "property": "recite",
               "input": {
@@ -79,6 +84,7 @@
           "description": "multiple verses",
           "cases": [
             {
+              "uuid": "7e17c794-402d-4ca6-8f96-4d8f6ee1ec7e",
               "description": "first two verses",
               "property": "recite",
               "input": {
@@ -94,6 +100,7 @@
               ]
             },
             {
+              "uuid": "949868e7-67e8-43d3-9bb4-69277fe020fb",
               "description": "last three verses",
               "property": "recite",
               "input": {
@@ -112,6 +119,7 @@
               ]
             },
             {
+              "uuid": "bc220626-126c-4e72-8df4-fddfc0c3e458",
               "description": "all verses",
               "property": "recite",
               "input": {
diff --git a/exercises/binary-search-tree/canonical-data.json b/exercises/binary-search-tree/canonical-data.json
index 52756c0a96..675957630e 100644
--- a/exercises/binary-search-tree/canonical-data.json
+++ b/exercises/binary-search-tree/canonical-data.json
@@ -30,6 +30,7 @@
         "}"
     ],
     "cases": [{
+            "uuid": "e9c93a78-c536-4750-a336-94583d23fafa",
             "description": "data is retained",
             "property": "data",
             "input": {
@@ -44,6 +45,7 @@
         {
             "description": "insert data at proper node",
             "cases": [{
+                    "uuid": "7a95c9e8-69f6-476a-b0c4-4170cb3f7c91",
                     "description": "smaller number at left node",
                     "property": "data",
                     "input": {
@@ -60,6 +62,7 @@
                     }
                 },
                 {
+                    "uuid": "22b89499-9805-4703-a159-1a6e434c1585",
                     "description": "same number at left node",
                     "property": "data",
                     "input": {
@@ -76,6 +79,7 @@
                     }
                 },
                 {
+                    "uuid": "2e85fdde-77b1-41ed-b6ac-26ce6b663e34",
                     "description": "greater number at right node",
                     "property": "data",
                     "input": {
@@ -94,6 +98,7 @@
             ]
         },
         {
+            "uuid": "dd898658-40ab-41d0-965e-7f145bf66e0b",
             "description": "can create complex tree",
             "property": "data",
             "input": {
@@ -132,6 +137,7 @@
         {
             "description": "can sort data",
             "cases": [{
+                    "uuid": "9e0c06ef-aeca-4202-b8e4-97f1ed057d56",
                     "description": "can sort single number",
                     "property": "sortedData",
                     "input": {
@@ -140,6 +146,7 @@
                     "expected": ["2"]
                 },
                 {
+                    "uuid": "425e6d07-fceb-4681-a4f4-e46920e380bb",
                     "description": "can sort if second number is smaller than first",
                     "property": "sortedData",
                     "input": {
@@ -148,6 +155,7 @@
                     "expected": ["1", "2"]
                 },
                 {
+                    "uuid": "bd7532cc-6988-4259-bac8-1d50140079ab",
                     "description": "can sort if second number is same as first",
                     "property": "sortedData",
                     "input": {
@@ -156,6 +164,7 @@
                     "expected": ["2", "2"]
                 },
                 {
+                    "uuid": "b6d1b3a5-9d79-44fd-9013-c83ca92ddd36",
                     "description": "can sort if second number is greater than first",
                     "property": "sortedData",
                     "input": {
@@ -164,6 +173,7 @@
                     "expected": ["2", "3"]
                 },
                 {
+                    "uuid": "d00ec9bd-1288-4171-b968-d44d0808c1c8",
                     "description": "can sort complex tree",
                     "property": "sortedData",
                     "input": {
@@ -174,4 +184,4 @@
             ]
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/exercises/binary-search/canonical-data.json b/exercises/binary-search/canonical-data.json
index 54c6e8a11e..9000d408a1 100644
--- a/exercises/binary-search/canonical-data.json
+++ b/exercises/binary-search/canonical-data.json
@@ -17,6 +17,7 @@
   ],
   "cases": [
     {
+      "uuid": "b55c24a9-a98d-4379-a08c-2adcf8ebeee8",
       "description": "finds a value in an array with one element",
       "property": "find",
       "input": {
@@ -26,6 +27,7 @@
       "expected": 0
     },
     {
+      "uuid": "73469346-b0a0-4011-89bf-989e443d503d",
       "description": "finds a value in the middle of an array",
       "property": "find",
       "input": {
@@ -35,6 +37,7 @@
       "expected": 3
     },
     {
+      "uuid": "327bc482-ab85-424e-a724-fb4658e66ddb",
       "description": "finds a value at the beginning of an array",
       "property": "find",
       "input": {
@@ -44,6 +47,7 @@
       "expected": 0
     },
     {
+      "uuid": "f9f94b16-fe5e-472c-85ea-c513804c7d59",
       "description": "finds a value at the end of an array",
       "property": "find",
       "input": {
@@ -53,6 +57,7 @@
       "expected": 6
     },
     {
+      "uuid": "f0068905-26e3-4342-856d-ad153cadb338",
       "description": "finds a value in an array of odd length",
       "property": "find",
       "input": {
@@ -62,6 +67,7 @@
       "expected": 9
     },
     {
+      "uuid": "fc316b12-c8b3-4f5e-9e89-532b3389de8c",
       "description": "finds a value in an array of even length",
       "property": "find",
       "input": {
@@ -71,6 +77,7 @@
       "expected": 5
     },
     {
+      "uuid": "da7db20a-354f-49f7-a6a1-650a54998aa6",
       "description": "identifies that a value is not included in the array",
       "property": "find",
       "input": {
@@ -80,6 +87,7 @@
       "expected": {"error": "value not in array"}
     },
     {
+      "uuid": "95d869ff-3daf-4c79-b622-6e805c675f97",
       "description": "a value smaller than the array's smallest value is not found",
       "property": "find",
       "input": {
@@ -89,6 +97,7 @@
       "expected": {"error": "value not in array"}
     },
     {
+      "uuid": "8b24ef45-6e51-4a94-9eac-c2bf38fdb0ba",
       "description": "a value larger than the array's largest value is not found",
       "property": "find",
       "input": {
@@ -98,6 +107,7 @@
       "expected": {"error": "value not in array"}
     },
     {
+      "uuid": "f439a0fa-cf42-4262-8ad1-64bf41ce566a",
       "description": "nothing is found in an empty array",
       "property": "find",
       "input": {
@@ -107,6 +117,7 @@
       "expected": {"error": "value not in array"}
     },
     {
+      "uuid": "2c353967-b56d-40b8-acff-ce43115eed64",
       "description": "nothing is found when the left and right bounds cross",
       "property": "find",
       "input": {
diff --git a/exercises/binary/canonical-data.json b/exercises/binary/canonical-data.json
index 8b51d34383..0cc634cb58 100644
--- a/exercises/binary/canonical-data.json
+++ b/exercises/binary/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "567fc71e-1013-4915-9285-bca0648c0844",
       "description": "binary 0 is decimal 0",
       "property": "decimal",
       "input": {
@@ -11,6 +12,7 @@
       "expected": 0
     },
     {
+      "uuid": "c0824fb1-6a0a-4e9a-a262-c6c00af99fa8",
       "description": "binary 1 is decimal 1",
       "property": "decimal",
       "input": {
@@ -19,6 +21,7 @@
       "expected": 1
     },
     {
+      "uuid": "4d2834fb-3cc3-4159-a8fd-da1098def8ed",
       "description": "binary 10 is decimal 2",
       "property": "decimal",
       "input": {
@@ -27,6 +30,7 @@
       "expected": 2
     },
     {
+      "uuid": "b7b2b649-4a7c-4808-9eb9-caf00529bac6",
       "description": "binary 11 is decimal 3",
       "property": "decimal",
       "input": {
@@ -35,6 +39,7 @@
       "expected": 3
     },
     {
+      "uuid": "de761aff-73cd-43c1-9e1f-0417f07b1e4a",
       "description": "binary 100 is decimal 4",
       "property": "decimal",
       "input": {
@@ -43,6 +48,7 @@
       "expected": 4
     },
     {
+      "uuid": "7849a8f7-f4a1-4966-963e-503282d6814c",
       "description": "binary 1001 is decimal 9",
       "property": "decimal",
       "input": {
@@ -51,6 +57,7 @@
       "expected": 9
     },
     {
+      "uuid": "836a101c-aecb-473b-ba78-962408dcda98",
       "description": "binary 11010 is decimal 26",
       "property": "decimal",
       "input": {
@@ -59,6 +66,7 @@
       "expected": 26
     },
     {
+      "uuid": "1c6822a4-8584-438b-8dd4-40f0f0b66371",
       "description": "binary 10001101000 is decimal 1128",
       "property": "decimal",
       "input": {
@@ -67,6 +75,7 @@
       "expected": 1128
     },
     {
+      "uuid": "91ffe632-8374-4016-b1d1-d8400d9f940d",
       "description": "binary ignores leading zeros",
       "property": "decimal",
       "input": {
@@ -75,6 +84,7 @@
       "expected": 31
     },
     {
+      "uuid": "44f7d8b1-ddc3-4751-8be3-700a538b421c",
       "description": "2 is not a valid binary digit",
       "property": "decimal",
       "input": {
@@ -83,6 +93,7 @@
       "expected": null
     },
     {
+      "uuid": "c263a24d-6870-420f-b783-628feefd7b6e",
       "description": "a number containing a non-binary digit is invalid",
       "property": "decimal",
       "input": {
@@ -91,6 +102,7 @@
       "expected": null
     },
     {
+      "uuid": "8d81305b-0502-4a07-bfba-051c5526d7f2",
       "description": "a number with trailing non-binary characters is invalid",
       "property": "decimal",
       "input": {
@@ -99,6 +111,7 @@
       "expected": null
     },
     {
+      "uuid": "a7f79b6b-039a-4d42-99b4-fcee56679f03",
       "description": "a number with leading non-binary characters is invalid",
       "property": "decimal",
       "input": {
@@ -107,6 +120,7 @@
       "expected": null
     },
     {
+      "uuid": "9e0ece9d-b8aa-46a0-a22b-3bed2e3f741e",
       "description": "a number with internal non-binary characters is invalid",
       "property": "decimal",
       "input": {
@@ -115,6 +129,7 @@
       "expected": null
     },
     {
+      "uuid": "46c8dd65-0c32-4273-bb0d-f2b111bccfbd",
       "description": "a number and a word whitespace separated is invalid",
       "property": "decimal",
       "input": {
diff --git a/exercises/bob/canonical-data.json b/exercises/bob/canonical-data.json
index 5497a301dc..6426127057 100644
--- a/exercises/bob/canonical-data.json
+++ b/exercises/bob/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.6.0",
   "cases": [
     {
+      "uuid": "e162fead-606f-437a-a166-d051915cea8e",
       "description": "stating something",
       "property": "response",
       "input": {
@@ -11,6 +12,7 @@
       "expected": "Whatever."
     },
     {
+      "uuid": "73a966dc-8017-47d6-bb32-cf07d1a5fcd9",
       "description": "shouting",
       "property": "response",
       "input": {
@@ -19,6 +21,7 @@
       "expected": "Whoa, chill out!"
     },
     {
+      "uuid": "d6c98afd-df35-4806-b55e-2c457c3ab748",
       "description": "shouting gibberish",
       "property": "response",
       "input": {
@@ -27,6 +30,7 @@
       "expected": "Whoa, chill out!"
     },
     {
+      "uuid": "8a2e771d-d6f1-4e3f-b6c6-b41495556e37",
       "description": "asking a question",
       "property": "response",
       "input": {
@@ -35,6 +39,7 @@
       "expected": "Sure."
     },
     {
+      "uuid": "81080c62-4e4d-4066-b30a-48d8d76920d9",
       "description": "asking a numeric question",
       "property": "response",
       "input": {
@@ -43,6 +48,7 @@
       "expected": "Sure."
     },
     {
+      "uuid": "2a02716d-685b-4e2e-a804-2adaf281c01e",
       "description": "asking gibberish",
       "property": "response",
       "input": {
@@ -51,6 +57,7 @@
       "expected": "Sure."
     },
     {
+      "uuid": "c02f9179-ab16-4aa7-a8dc-940145c385f7",
       "description": "talking forcefully",
       "property": "response",
       "input": {
@@ -59,6 +66,7 @@
       "expected": "Whatever."
     },
     {
+      "uuid": "153c0e25-9bb5-4ec5-966e-598463658bcd",
       "description": "using acronyms in regular speech",
       "property": "response",
       "input": {
@@ -67,6 +75,7 @@
       "expected": "Whatever."
     },
     {
+      "uuid": "a5193c61-4a92-4f68-93e2-f554eb385ec6",
       "description": "forceful question",
       "property": "response",
       "input": {
@@ -75,6 +84,7 @@
       "expected": "Calm down, I know what I'm doing!"
     },
     {
+      "uuid": "a20e0c54-2224-4dde-8b10-bd2cdd4f61bc",
       "description": "shouting numbers",
       "property": "response",
       "input": {
@@ -83,6 +93,7 @@
       "expected": "Whoa, chill out!"
     },
     {
+      "uuid": "f7bc4b92-bdff-421e-a238-ae97f230ccac",
       "description": "no letters",
       "property": "response",
       "input": {
@@ -91,6 +102,7 @@
       "expected": "Whatever."
     },
     {
+      "uuid": "bb0011c5-cd52-4a5b-8bfb-a87b6283b0e2",
       "description": "question with no letters",
       "property": "response",
       "input": {
@@ -99,6 +111,7 @@
       "expected": "Sure."
     },
     {
+      "uuid": "496143c8-1c31-4c01-8a08-88427af85c66",
       "description": "shouting with special characters",
       "property": "response",
       "input": {
@@ -107,6 +120,7 @@
       "expected": "Whoa, chill out!"
     },
     {
+      "uuid": "e6793c1c-43bd-4b8d-bc11-499aea73925f",
       "description": "shouting with no exclamation mark",
       "property": "response",
       "input": {
@@ -115,6 +129,7 @@
       "expected": "Whoa, chill out!"
     },
     {
+      "uuid": "aa8097cc-c548-4951-8856-14a404dd236a",
       "description": "statement containing question mark",
       "property": "response",
       "input": {
@@ -123,6 +138,7 @@
       "expected": "Whatever."
     },
     {
+      "uuid": "9bfc677d-ea3a-45f2-be44-35bc8fa3753e",
       "description": "non-letters with question",
       "property": "response",
       "input": {
@@ -131,6 +147,7 @@
       "expected": "Sure."
     },
     {
+      "uuid": "8608c508-f7de-4b17-985b-811878b3cf45",
       "description": "prattling on",
       "property": "response",
       "input": {
@@ -139,6 +156,7 @@
       "expected": "Sure."
     },
     {
+      "uuid": "bc39f7c6-f543-41be-9a43-fd1c2f753fc0",
       "description": "silence",
       "property": "response",
       "input": {
@@ -147,6 +165,7 @@
       "expected": "Fine. Be that way!"
     },
     {
+      "uuid": "d6c47565-372b-4b09-b1dd-c40552b8378b",
       "description": "prolonged silence",
       "property": "response",
       "input": {
@@ -155,6 +174,7 @@
       "expected": "Fine. Be that way!"
     },
     {
+      "uuid": "4428f28d-4100-4d85-a902-e5a78cb0ecd3",
       "description": "alternate silence",
       "property": "response",
       "input": {
@@ -163,6 +183,7 @@
       "expected": "Fine. Be that way!"
     },
     {
+      "uuid": "66953780-165b-4e7e-8ce3-4bcb80b6385a",
       "description": "multiple line question",
       "property": "response",
       "input": {
@@ -171,6 +192,7 @@
       "expected": "Whatever."
     },
     {
+      "uuid": "5371ef75-d9ea-4103-bcfa-2da973ddec1b",
       "description": "starting with whitespace",
       "property": "response",
       "input": {
@@ -179,6 +201,7 @@
       "expected": "Whatever."
     },
     {
+      "uuid": "05b304d6-f83b-46e7-81e0-4cd3ca647900",
       "description": "ending with whitespace",
       "property": "response",
       "input": {
@@ -187,6 +210,7 @@
       "expected": "Sure."
     },
     {
+      "uuid": "72bd5ad3-9b2f-4931-a988-dce1f5771de2",
       "description": "other whitespace",
       "property": "response",
       "input": {
@@ -195,6 +219,7 @@
       "expected": "Fine. Be that way!"
     },
     {
+      "uuid": "12983553-8601-46a8-92fa-fcaa3bc4a2a0",
       "description": "non-question ending with whitespace",
       "property": "response",
       "input": {
diff --git a/exercises/book-store/canonical-data.json b/exercises/book-store/canonical-data.json
index 72dd54b26a..c0d8049721 100644
--- a/exercises/book-store/canonical-data.json
+++ b/exercises/book-store/canonical-data.json
@@ -14,6 +14,7 @@
       ],
       "cases": [
         {
+         "uuid": "17146bd5-2e80-4557-ab4c-05632b6b0d01",
          "property": "total",
          "description": "Only a single book",
          "comments": ["Suggested grouping, [[1]]."],
@@ -23,6 +24,7 @@
          "expected": 800
         },
         {
+         "uuid": "cc2de9ac-ff2a-4efd-b7c7-bfe0f43271ce",
          "property": "total",
          "description": "Two of the same book",
          "comments": ["Suggested grouping, [[2],[2]]."],
@@ -32,6 +34,7 @@
          "expected": 1600
         },
         {
+         "uuid": "5a86eac0-45d2-46aa-bbf0-266b94393a1a",
          "property": "total",
          "description": "Empty basket",
          "comments": ["Suggested grouping, []."],
@@ -41,6 +44,7 @@
          "expected": 0
         },
         {
+         "uuid": "158bd19a-3db4-4468-ae85-e0638a688990",
          "property": "total",
          "description": "Two different books",
          "comments": ["Suggested grouping, [[1,2]]."],
@@ -50,6 +54,7 @@
          "expected": 1520
         },
         {
+         "uuid": "f3833f6b-9332-4a1f-ad98-6c3f8e30e163",
          "property": "total",
          "description": "Three different books",
          "comments": ["Suggested grouping, [[1,2,3]]."],
@@ -59,6 +64,7 @@
          "expected": 2160
         },
         {
+         "uuid": "1951a1db-2fb6-4cd1-a69a-f691b6dd30a2",
          "property": "total",
          "description": "Four different books",
          "comments": ["Suggested grouping, [[1,2,3,4]]."],
@@ -68,6 +74,7 @@
          "expected": 2560
         },
         {
+         "uuid": "d70f6682-3019-4c3f-aede-83c6a8c647a3",
          "property": "total",
          "description": "Five different books",
          "comments": ["Suggested grouping, [[1,2,3,4,5]]."],
@@ -77,6 +84,7 @@
          "expected": 3000
         },
         {
+         "uuid": "78cacb57-911a-45f1-be52-2a5bd428c634",
          "property": "total",
          "description": "Two groups of four is cheaper than group of five plus group of three",
          "comments": ["Suggested grouping, [[1,2,3,4],[1,2,3,5]]."],
@@ -86,6 +94,7 @@
          "expected": 5120
         },
         {
+         "uuid": "f808b5a4-e01f-4c0d-881f-f7b90d9739da",
          "property": "total",
          "description": "Two groups of four is cheaper than groups of five and three",
          "comments": ["Suggested grouping, [[1,2,4,5],[1,3,4,5]]. This differs from the other 'two groups of four' test in that it will fail for solutions that add books to groups in the order in which they appear in the list."],
@@ -95,6 +104,7 @@
          "expected": 5120
         },
         {
+         "uuid": "fe96401c-5268-4be2-9d9e-19b76478007c",
          "property": "total",
          "description": "Group of four plus group of two is cheaper than two groups of three",
          "comments": ["Suggested grouping, [[1,2,3,4],[1,2]]."],
@@ -104,6 +114,7 @@
          "expected": 4080
         },
         {
+         "uuid": "68ea9b78-10ad-420e-a766-836a501d3633",
          "property": "total",
          "description": "Two each of first 4 books and 1 copy each of rest",
          "comments": ["Suggested grouping, [[1,2,3,4,5],[1,2,3,4]]."],
@@ -113,6 +124,7 @@
          "expected": 5560
         },
         {
+         "uuid": "c0a779d5-a40c-47ae-9828-a340e936b866",
          "property": "total",
          "description": "Two copies of each book",
          "comments": ["Suggested grouping, [[1,2,3,4,5],[1,2,3,4,5]]."],
@@ -122,6 +134,7 @@
          "expected": 6000
         },
         {
+         "uuid": "18fd86fe-08f1-4b68-969b-392b8af20513",
          "property": "total",
          "description": "Three copies of first book and 2 each of remaining",
          "comments": ["Suggested grouping, [[1,2,3,4,5],[1,2,3,4,5],[1]]."],
@@ -131,6 +144,7 @@
          "expected": 6800
         },
         {
+         "uuid": "0b19a24d-e4cf-4ec8-9db2-8899a41af0da",
          "property": "total",
          "description": "Three each of first 2 books and 2 each of remaining books",
          "comments": ["Suggested grouping, [[1,2,3,4,5],[1,2,3,4,5],[1,2]]."],
@@ -140,6 +154,7 @@
          "expected": 7520
         },
         {
+         "uuid": "bb376344-4fb2-49ab-ab85-e38d8354a58d",
          "property": "total",
          "description": "Four groups of four are cheaper than two groups each of five and three",
          "comments": ["Suggested grouping, [[1,2,3,4],[1,2,3,5],[1,2,3,4],[1,2,3,5]]."],
diff --git a/exercises/bowling/canonical-data.json b/exercises/bowling/canonical-data.json
index 4de708f8f9..834a43b1f1 100644
--- a/exercises/bowling/canonical-data.json
+++ b/exercises/bowling/canonical-data.json
@@ -21,6 +21,7 @@
     "whether that be via exceptions, optional values, or otherwise."
   ],
   "cases": [{
+    "uuid": "656ae006-25c2-438c-a549-f338e7ec7441",
     "description": "should be able to score a game with all zeros",
     "property": "score",
     "input": {
@@ -28,6 +29,7 @@
     },
     "expected": 0
   }, {
+    "uuid": "f85dcc56-cd6b-4875-81b3-e50921e3597b",
     "description": "should be able to score a game with no strikes or spares",
     "property": "score",
     "input": {
@@ -35,6 +37,7 @@
     },
     "expected": 90
   }, {
+    "uuid": "d1f56305-3ac2-4fe0-8645-0b37e3073e20",
     "description": "a spare followed by zeros is worth ten points",
     "property": "score",
     "input": {
@@ -42,6 +45,7 @@
     },
     "expected": 10
   }, {
+    "uuid": "0b8c8bb7-764a-4287-801a-f9e9012f8be4",
     "description": "points scored in the roll after a spare are counted twice",
     "property": "score",
     "input": {
@@ -49,6 +53,7 @@
     },
     "expected": 16
   }, {
+    "uuid": "4d54d502-1565-4691-84cd-f29a09c65bea",
     "description": "consecutive spares each get a one roll bonus",
     "property": "score",
     "input": {
@@ -56,6 +61,7 @@
     },
     "expected": 31
   }, {
+    "uuid": "e5c9cf3d-abbe-4b74-ad48-34051b2b08c0",
     "description": "a spare in the last frame gets a one roll bonus that is counted once",
     "property": "score",
     "input": {
@@ -63,6 +69,7 @@
     },
     "expected": 17
   }, {
+    "uuid": "75269642-2b34-4b72-95a4-9be28ab16902",
     "description": "a strike earns ten points in a frame with a single roll",
     "property": "score",
     "input": {
@@ -70,6 +77,7 @@
     },
     "expected": 10
   }, {
+    "uuid": "037f978c-5d01-4e49-bdeb-9e20a2e6f9a6",
     "description": "points scored in the two rolls after a strike are counted twice as a bonus",
     "property": "score",
     "input": {
@@ -77,6 +85,7 @@
     },
     "expected": 26
   }, {
+    "uuid": "1635e82b-14ec-4cd1-bce4-4ea14bd13a49",
     "description": "consecutive strikes each get the two roll bonus",
     "property": "score",
     "input": {
@@ -84,6 +93,7 @@
     },
     "expected": 81
   }, {
+    "uuid": "e483e8b6-cb4b-4959-b310-e3982030d766",
     "description": "a strike in the last frame gets a two roll bonus that is counted once",
     "property": "score",
     "input": {
@@ -91,6 +101,7 @@
     },
     "expected": 18
   }, {
+    "uuid": "9d5c87db-84bc-4e01-8e95-53350c8af1f8",
     "description": "rolling a spare with the two roll bonus does not get a bonus roll",
     "property": "score",
     "input": {
@@ -98,6 +109,7 @@
     },
     "expected": 20
   }, {
+    "uuid": "576faac1-7cff-4029-ad72-c16bcada79b5",
     "description": "strikes with the two roll bonus do not get bonus rolls",
     "property": "score",
     "input": {
@@ -105,6 +117,7 @@
     },
     "expected": 30
   }, {
+    "uuid": "72e24404-b6c6-46af-b188-875514c0377b",
     "description": "a strike with the one roll bonus after a spare in the last frame does not get a bonus",
     "property": "score",
     "input": {
@@ -112,6 +125,7 @@
     },
     "expected": 20
   }, {
+    "uuid": "62ee4c72-8ee8-4250-b794-234f1fec17b1",
     "description": "all strikes is a perfect game",
     "property": "score",
     "input": {
@@ -119,6 +133,7 @@
     },
     "expected": 300
   }, {
+    "uuid": "1245216b-19c6-422c-b34b-6e4012d7459f",
     "description": "rolls cannot score negative points",
     "property": "roll",
     "input": {
@@ -127,6 +142,7 @@
     },
     "expected": {"error": "Negative roll is invalid"}
   }, {
+    "uuid": "5fcbd206-782c-4faa-8f3a-be5c538ba841",
     "description": "a roll cannot score more than 10 points",
     "property": "roll",
     "input": {
@@ -135,6 +151,7 @@
     },
     "expected": {"error": "Pin count exceeds pins on the lane"}
   }, {
+    "uuid": "fb023c31-d842-422d-ad7e-79ce1db23c21",
     "description": "two rolls in a frame cannot score more than 10 points",
     "property": "roll",
     "input": {
@@ -143,6 +160,7 @@
     },
     "expected": {"error": "Pin count exceeds pins on the lane"}
   }, {
+    "uuid": "6082d689-d677-4214-80d7-99940189381b",
     "description": "bonus roll after a strike in the last frame cannot score more than 10 points",
     "property": "roll",
     "input": {
@@ -151,6 +169,7 @@
     },
     "expected": {"error": "Pin count exceeds pins on the lane"}
   }, {
+    "uuid": "e9565fe6-510a-4675-ba6b-733a56767a45",
     "description": "two bonus rolls after a strike in the last frame cannot score more than 10 points",
     "property": "roll",
     "input": {
@@ -159,6 +178,7 @@
     },
     "expected": {"error": "Pin count exceeds pins on the lane"}
   }, {
+    "uuid": "2f6acf99-448e-4282-8103-0b9c7df99c3d",
     "description": "two bonus rolls after a strike in the last frame can score more than 10 points if one is a strike",
     "property": "score",
     "input": {
@@ -166,6 +186,7 @@
     },
     "expected": 26
   }, {
+    "uuid": "6380495a-8bc4-4cdb-a59f-5f0212dbed01",
     "description": "the second bonus rolls after a strike in the last frame cannot be a strike if the first one is not a strike",
     "property": "roll",
     "input": {
@@ -174,6 +195,7 @@
     },
     "expected": {"error": "Pin count exceeds pins on the lane"}
   }, {
+    "uuid": "2b2976ea-446c-47a3-9817-42777f09fe7e",
     "description": "second bonus roll after a strike in the last frame cannot score more than 10 points",
     "property": "roll",
     "input": {
@@ -182,6 +204,7 @@
     },
     "expected": {"error": "Pin count exceeds pins on the lane"}
   }, {
+    "uuid": "29220245-ac8d-463d-bc19-98a94cfada8a",
     "description": "an unstarted game cannot be scored",
     "property": "score",
     "input": {
@@ -189,6 +212,7 @@
     },
     "expected": {"error": "Score cannot be taken until the end of the game"}
   }, {
+    "uuid": "4473dc5d-1f86-486f-bf79-426a52ddc955",
     "description": "an incomplete game cannot be scored",
     "property": "score",
     "input": {
@@ -196,6 +220,7 @@
     },
     "expected": {"error": "Score cannot be taken until the end of the game"}
   }, {
+    "uuid": "2ccb8980-1b37-4988-b7d1-e5701c317df3",
     "description": "cannot roll if game already has ten frames",
     "property": "roll",
     "input": {
@@ -204,6 +229,7 @@
     },
     "expected": {"error": "Cannot roll after game is over"}
   }, {
+    "uuid": "4864f09b-9df3-4b65-9924-c595ed236f1b",
     "description": "bonus rolls for a strike in the last frame must be rolled before score can be calculated",
     "property": "score",
     "input": {
@@ -211,6 +237,7 @@
     },
     "expected": {"error": "Score cannot be taken until the end of the game"}
   }, {
+    "uuid": "537f4e37-4b51-4d1c-97e2-986eb37b2ac1",
     "description": "both bonus rolls for a strike in the last frame must be rolled before score can be calculated",
     "property": "score",
     "input": {
@@ -218,6 +245,7 @@
     },
     "expected": {"error": "Score cannot be taken until the end of the game"}
   }, {
+    "uuid": "8134e8c1-4201-4197-bf9f-1431afcde4b9",
     "description": "bonus roll for a spare in the last frame must be rolled before score can be calculated",
     "property": "score",
     "input": {
@@ -225,6 +253,7 @@
     },
     "expected": {"error": "Score cannot be taken until the end of the game"}
   }, {
+    "uuid": "9d4a9a55-134a-4bad-bae8-3babf84bd570",
     "description": "cannot roll after bonus roll for spare",
     "property": "roll",
     "input": {
@@ -233,6 +262,7 @@
     },
     "expected": {"error": "Cannot roll after game is over"}
   }, {
+    "uuid": "d3e02652-a799-4ae3-b53b-68582cc604be",
     "description": "cannot roll after bonus rolls for strike",
     "property": "roll",
     "input": {
diff --git a/exercises/change/canonical-data.json b/exercises/change/canonical-data.json
index 31ce6f7100..f29bd56f73 100644
--- a/exercises/change/canonical-data.json
+++ b/exercises/change/canonical-data.json
@@ -8,6 +8,7 @@
   ],
   "cases": [
     {
+      "uuid": "36887bea-7f92-4a9c-b0cc-c0e886b3ecc8",
       "description": "single coin change",
       "property": "findFewestCoins",
       "input": {
@@ -17,6 +18,7 @@
       "expected": [25]
     },
     {
+      "uuid": "cef21ccc-0811-4e6e-af44-f011e7eab6c6",
       "description": "multiple coin change",
       "property": "findFewestCoins",
       "input": {
@@ -26,6 +28,7 @@
       "expected": [5, 10]
     },
     {
+      "uuid": "d60952bc-0c1a-4571-bf0c-41be72690cb3",
       "description": "change with Lilliputian Coins",
       "property": "findFewestCoins",
       "input": {
@@ -35,6 +38,7 @@
       "expected": [4, 4, 15]
     },
     {
+      "uuid": "408390b9-fafa-4bb9-b608-ffe6036edb6c",
       "description": "change with Lower Elbonia Coins",
       "property": "findFewestCoins",
       "input": {
@@ -44,6 +48,7 @@
       "expected": [21, 21, 21]
     },
     {
+      "uuid": "7421a4cb-1c48-4bf9-99c7-7f049689132f",
       "description": "large target values",
       "property": "findFewestCoins",
       "input": {
@@ -55,6 +60,7 @@
                   , 100, 100, 100, 100, 100 ]
     },
     {
+      "uuid": "f79d2e9b-0ae3-4d6a-bb58-dc978b0dba28",
       "description": "possible change without unit coins available",
       "property": "findFewestCoins",
       "input": {
@@ -64,6 +70,7 @@
       "expected": [2, 2, 2, 5, 10]
     },
     {
+      "uuid": "9a166411-d35d-4f7f-a007-6724ac266178",
       "description": "another possible change without unit coins available",
       "property": "findFewestCoins",
       "input": {
@@ -73,6 +80,7 @@
       "expected": [4, 4, 4, 5, 5, 5]
     },
     {
+      "uuid": "bbbcc154-e9e9-4209-a4db-dd6d81ec26bb",
       "description": "no coins make 0 change",
       "property": "findFewestCoins",
       "input": {
@@ -82,6 +90,7 @@
       "expected": []
     },
     {
+      "uuid": "c8b81d5a-49bd-4b61-af73-8ee5383a2ce1",
       "description": "error testing for change smaller than the smallest of coins",
       "property": "findFewestCoins",
       "input": {
@@ -91,6 +100,7 @@
       "expected": {"error": "can't make target with given coins"}
     },
     {
+      "uuid": "3c43e3e4-63f9-46ac-9476-a67516e98f68",
       "description": "error if no combination can add up to target",
       "property": "findFewestCoins",
       "input": {
@@ -100,6 +110,7 @@
       "expected": {"error": "can't make target with given coins"}
     },
     {
+      "uuid": "8fe1f076-9b2d-4f44-89fe-8a6ccd63c8f3",
       "description": "cannot find negative change values",
       "property": "findFewestCoins",
       "input": {
@@ -109,4 +120,4 @@
       "expected": {"error": "target can't be negative"}
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/circular-buffer/canonical-data.json b/exercises/circular-buffer/canonical-data.json
index ed474a46b4..b8da6d613c 100644
--- a/exercises/circular-buffer/canonical-data.json
+++ b/exercises/circular-buffer/canonical-data.json
@@ -26,6 +26,7 @@
   ],
   "cases": [
     {
+      "uuid": "28268ed4-4ff3-45f3-820e-895b44d53dfa",
       "description": "reading empty buffer should fail",
       "property": "run",
       "input": {
@@ -40,6 +41,7 @@
       "expected": {}
     },
     {
+      "uuid": "2e6db04a-58a1-425d-ade8-ac30b5f318f3",
       "description": "can read an item just written",
       "property": "run",
       "input": {
@@ -60,6 +62,7 @@
       "expected": {}
     },
     {
+      "uuid": "90741fe8-a448-45ce-be2b-de009a24c144",
       "description": "each item may only be read once",
       "property": "run",
       "input": {
@@ -84,6 +87,7 @@
       "expected": {}
     },
     {
+      "uuid": "be0e62d5-da9c-47a8-b037-5db21827baa7",
       "description": "items are read in the order they are written",
       "property": "run",
       "input": {
@@ -114,6 +118,7 @@
       "expected": {}
     },
     {
+      "uuid": "2af22046-3e44-4235-bfe6-05ba60439d38",
       "description": "full buffer can't be written to",
       "property": "run",
       "input": {
@@ -134,6 +139,7 @@
       "expected": {}
     },
     {
+      "uuid": "547d192c-bbf0-4369-b8fa-fc37e71f2393",
       "description": "a read frees up capacity for another write",
       "property": "run",
       "input": {
@@ -164,6 +170,7 @@
       "expected": {}
     },
     {
+      "uuid": "04a56659-3a81-4113-816b-6ecb659b4471",
       "description": "read position is maintained even across multiple writes",
       "property": "run",
       "input": {
@@ -204,6 +211,7 @@
       "expected": {}
     },
     {
+      "uuid": "60c3a19a-81a7-43d7-bb0a-f07242b1111f",
       "description": "items cleared out of buffer can't be read",
       "property": "run",
       "input": {
@@ -226,6 +234,7 @@
       "expected": {}
     },
     {
+      "uuid": "45f3ae89-3470-49f3-b50e-362e4b330a59",
       "description": "clear frees up capacity for another write",
       "property": "run",
       "input": {
@@ -254,6 +263,7 @@
       "expected": {}
     },
     {
+      "uuid": "e1ac5170-a026-4725-bfbe-0cf332eddecd",
       "description": "clear does nothing on empty buffer",
       "property": "run",
       "input": {
@@ -277,6 +287,7 @@
       "expected": {}
     },
     {
+      "uuid": "9c2d4f26-3ec7-453f-a895-7e7ff8ae7b5b",
       "description": "overwrite acts like write on non-full buffer",
       "property": "run",
       "input": {
@@ -306,6 +317,7 @@
       "expected": {}
     },
     {
+      "uuid": "880f916b-5039-475c-bd5c-83463c36a147",
       "description": "overwrite replaces the oldest item on full buffer",
       "property": "run",
       "input": {
@@ -340,6 +352,7 @@
       "expected": {}
     },
     {
+      "uuid": "bfecab5b-aca1-4fab-a2b0-cd4af2b053c3",
       "description": "overwrite replaces the oldest item remaining in buffer following a read",
       "property": "run",
       "input": {
@@ -394,6 +407,7 @@
       "expected": {}
     },
     {
+      "uuid": "9cebe63a-c405-437b-8b62-e3fdc1ecec5a",
       "description": "initial clear does not affect wrapping around",
       "property": "run",
       "input": {
diff --git a/exercises/clock/canonical-data.json b/exercises/clock/canonical-data.json
index e7cee71a1b..9b3a458c19 100644
--- a/exercises/clock/canonical-data.json
+++ b/exercises/clock/canonical-data.json
@@ -12,6 +12,7 @@
       "description": "Create a new clock with an initial time",
       "cases": [
         {
+          "uuid": "a577bacc-106b-496e-9792-b3083ea8705e",
           "description": "on the hour",
           "property": "create",
           "input": {
@@ -21,6 +22,7 @@
           "expected": "08:00"
         },
         {
+          "uuid": "b5d0c360-3b88-489b-8e84-68a1c7a4fa23",
           "description": "past the hour",
           "property": "create",
           "input": {
@@ -30,6 +32,7 @@
           "expected": "11:09"
         },
         {
+          "uuid": "473223f4-65f3-46ff-a9f7-7663c7e59440",
           "description": "midnight is zero hours",
           "property": "create",
           "input": {
@@ -39,6 +42,7 @@
           "expected": "00:00"
         },
         {
+          "uuid": "ca95d24a-5924-447d-9a96-b91c8334725c",
           "description": "hour rolls over",
           "property": "create",
           "input": {
@@ -48,6 +52,7 @@
           "expected": "01:00"
         },
         {
+          "uuid": "f3826de0-0925-4d69-8ac8-89aea7e52b78",
           "description": "hour rolls over continuously",
           "property": "create",
           "input": {
@@ -57,6 +62,7 @@
           "expected": "04:00"
         },
         {
+          "uuid": "a02f7edf-dfd4-4b11-b21a-86de3cc6a95c",
           "description": "sixty minutes is next hour",
           "property": "create",
           "input": {
@@ -66,6 +72,7 @@
           "expected": "02:00"
         },
         {
+          "uuid": "8f520df6-b816-444d-b90f-8a477789beb5",
           "description": "minutes roll over",
           "property": "create",
           "input": {
@@ -75,6 +82,7 @@
           "expected": "02:40"
         },
         {
+          "uuid": "c75c091b-47ac-4655-8d40-643767fc4eed",
           "description": "minutes roll over continuously",
           "property": "create",
           "input": {
@@ -84,6 +92,7 @@
           "expected": "04:43"
         },
         {
+          "uuid": "06343ecb-cf39-419d-a3f5-dcbae0cc4c57",
           "description": "hour and minutes roll over",
           "property": "create",
           "input": {
@@ -93,6 +102,7 @@
           "expected": "03:40"
         },
         {
+          "uuid": "be60810e-f5d9-4b58-9351-a9d1e90e660c",
           "description": "hour and minutes roll over continuously",
           "property": "create",
           "input": {
@@ -102,6 +112,7 @@
           "expected": "11:01"
         },
         {
+          "uuid": "1689107b-0b5c-4bea-aad3-65ec9859368a",
           "description": "hour and minutes roll over to exactly midnight",
           "property": "create",
           "input": {
@@ -111,6 +122,7 @@
           "expected": "00:00"
         },
         {
+          "uuid": "d3088ee8-91b7-4446-9e9d-5e2ad6219d91",
           "description": "negative hour",
           "property": "create",
           "input": {
@@ -120,6 +132,7 @@
           "expected": "23:15"
         },
         {
+          "uuid": "77ef6921-f120-4d29-bade-80d54aa43b54",
           "description": "negative hour rolls over",
           "property": "create",
           "input": {
@@ -129,6 +142,7 @@
           "expected": "23:00"
         },
         {
+          "uuid": "359294b5-972f-4546-bb9a-a85559065234",
           "description": "negative hour rolls over continuously",
           "property": "create",
           "input": {
@@ -138,6 +152,7 @@
           "expected": "05:00"
         },
         {
+          "uuid": "509db8b7-ac19-47cc-bd3a-a9d2f30b03c0",
           "description": "negative minutes",
           "property": "create",
           "input": {
@@ -147,6 +162,7 @@
           "expected": "00:20"
         },
         {
+          "uuid": "5d6bb225-130f-4084-84fd-9e0df8996f2a",
           "description": "negative minutes roll over",
           "property": "create",
           "input": {
@@ -156,6 +172,7 @@
           "expected": "22:20"
         },
         {
+          "uuid": "d483ceef-b520-4f0c-b94a-8d2d58cf0484",
           "description": "negative minutes roll over continuously",
           "property": "create",
           "input": {
@@ -165,6 +182,7 @@
           "expected": "16:40"
         },
         {
+          "uuid": "1cd19447-19c6-44bf-9d04-9f8305ccb9ea",
           "description": "negative sixty minutes is previous hour",
           "property": "create",
           "input": {
@@ -174,6 +192,7 @@
           "expected": "01:00"
         },
         {
+          "uuid": "9d3053aa-4f47-4afc-bd45-d67a72cef4dc",
           "description": "negative hour and minutes both roll over",
           "property": "create",
           "input": {
@@ -183,6 +202,7 @@
           "expected": "20:20"
         },
         {
+          "uuid": "51d41fcf-491e-4ca0-9cae-2aa4f0163ad4",
           "description": "negative hour and minutes both roll over continuously",
           "property": "create",
           "input": {
@@ -197,6 +217,7 @@
       "description": "Add minutes",
       "cases": [
         {
+          "uuid": "d098e723-ad29-4ef9-997a-2693c4c9d89a",
           "description": "add minutes",
           "property": "add",
           "input": {
@@ -207,6 +228,7 @@
           "expected": "10:03"
         },
         {
+          "uuid": "b6ec8f38-e53e-4b22-92a7-60dab1f485f4",
           "description": "add no minutes",
           "property": "add",
           "input": {
@@ -217,6 +239,7 @@
           "expected": "06:41"
         },
         {
+          "uuid": "efd349dd-0785-453e-9ff8-d7452a8e7269",
           "description": "add to next hour",
           "property": "add",
           "input": {
@@ -227,6 +250,7 @@
           "expected": "01:25"
         },
         {
+          "uuid": "749890f7-aba9-4702-acce-87becf4ef9fe",
           "description": "add more than one hour",
           "property": "add",
           "input": {
@@ -237,6 +261,7 @@
           "expected": "11:01"
         },
         {
+          "uuid": "da63e4c1-1584-46e3-8d18-c9dc802c1713",
           "description": "add more than two hours with carry",
           "property": "add",
           "input": {
@@ -247,6 +272,7 @@
           "expected": "03:25"
         },
         {
+          "uuid": "be167a32-3d33-4cec-a8bc-accd47ddbb71",
           "description": "add across midnight",
           "property": "add",
           "input": {
@@ -257,6 +283,7 @@
           "expected": "00:01"
         },
         {
+          "uuid": "6672541e-cdae-46e4-8be7-a820cc3be2a8",
           "description": "add more than one day (1500 min = 25 hrs)",
           "property": "add",
           "input": {
@@ -267,6 +294,7 @@
           "expected": "06:32"
         },
         {
+          "uuid": "1918050d-c79b-4cb7-b707-b607e2745c7e",
           "description": "add more than two days",
           "property": "add",
           "input": {
@@ -282,6 +310,7 @@
       "description": "Subtract minutes",
       "cases": [
         {
+          "uuid": "37336cac-5ede-43a5-9026-d426cbe40354",
           "description": "subtract minutes",
           "property": "subtract",
           "input": {
@@ -292,6 +321,7 @@
           "expected": "10:00"
         },
         {
+          "uuid": "0aafa4d0-3b5f-4b12-b3af-e3a9e09c047b",
           "description": "subtract to previous hour",
           "property": "subtract",
           "input": {
@@ -302,6 +332,7 @@
           "expected": "09:33"
         },
         {
+          "uuid": "9b4e809c-612f-4b15-aae0-1df0acb801b9",
           "description": "subtract more than an hour",
           "property": "subtract",
           "input": {
@@ -312,6 +343,7 @@
           "expected": "08:53"
         },
         {
+          "uuid": "8b04bb6a-3d33-4e6c-8de9-f5de6d2c70d6",
           "description": "subtract across midnight",
           "property": "subtract",
           "input": {
@@ -322,6 +354,7 @@
           "expected": "23:59"
         },
         {
+          "uuid": "07c3bbf7-ce4d-4658-86e8-4a77b7a5ccd9",
           "description": "subtract more than two hours",
           "property": "subtract",
           "input": {
@@ -332,6 +365,7 @@
           "expected": "21:20"
         },
         {
+          "uuid": "90ac8a1b-761c-4342-9c9c-cdc3ed5db097",
           "description": "subtract more than two hours with borrow",
           "property": "subtract",
           "input": {
@@ -342,6 +376,7 @@
           "expected": "03:35"
         },
         {
+          "uuid": "2149f985-7136-44ad-9b29-ec023a97a2b7",
           "description": "subtract more than one day (1500 min = 25 hrs)",
           "property": "subtract",
           "input": {
@@ -352,6 +387,7 @@
           "expected": "04:32"
         },
         {
+          "uuid": "ba11dbf0-ac27-4acb-ada9-3b853ec08c97",
           "description": "subtract more than two days",
           "property": "subtract",
           "input": {
@@ -367,6 +403,7 @@
       "description": "Compare two clocks for equality",
       "cases": [
         {
+          "uuid": "f2fdad51-499f-4c9b-a791-b28c9282e311",
           "description": "clocks with same time",
           "property": "equal",
           "input": {
@@ -382,6 +419,7 @@
           "expected": true
         },
         {
+          "uuid": "5d409d4b-f862-4960-901e-ec430160b768",
           "description": "clocks a minute apart",
           "property": "equal",
           "input": {
@@ -397,6 +435,7 @@
           "expected": false
         },
         {
+          "uuid": "a6045fcf-2b52-4a47-8bb2-ef10a064cba5",
           "description": "clocks an hour apart",
           "property": "equal",
           "input": {
@@ -412,6 +451,7 @@
           "expected": false
         },
         {
+          "uuid": "66b12758-0be5-448b-a13c-6a44bce83527",
           "description": "clocks with hour overflow",
           "property": "equal",
           "input": {
@@ -427,6 +467,7 @@
           "expected": true
         },
         {
+          "uuid": "2b19960c-212e-4a71-9aac-c581592f8111",
           "description": "clocks with hour overflow by several days",
           "property": "equal",
           "input": {
@@ -442,6 +483,7 @@
           "expected": true
         },
         {
+          "uuid": "6f8c6541-afac-4a92-b0c2-b10d4e50269f",
           "description": "clocks with negative hour",
           "property": "equal",
           "input": {
@@ -457,6 +499,7 @@
           "expected": true
         },
         {
+          "uuid": "bb9d5a68-e324-4bf5-a75e-0e9b1f97a90d",
           "description": "clocks with negative hour that wraps",
           "property": "equal",
           "input": {
@@ -472,6 +515,7 @@
           "expected": true
         },
         {
+          "uuid": "56c0326d-565b-4d19-a26f-63b3205778b7",
           "description": "clocks with negative hour that wraps multiple times",
           "property": "equal",
           "input": {
@@ -487,6 +531,7 @@
           "expected": true
         },
         {
+          "uuid": "c90b9de8-ddff-4ffe-9858-da44a40fdbc2",
           "description": "clocks with minute overflow",
           "property": "equal",
           "input": {
@@ -502,6 +547,7 @@
           "expected": true
         },
         {
+          "uuid": "533a3dc5-59a7-491b-b728-a7a34fe325de",
           "description": "clocks with minute overflow by several days",
           "property": "equal",
           "input": {
@@ -517,6 +563,7 @@
           "expected": true
         },
         {
+          "uuid": "fff49e15-f7b7-4692-a204-0f6052d62636",
           "description": "clocks with negative minute",
           "property": "equal",
           "input": {
@@ -532,6 +579,7 @@
           "expected": true
         },
         {
+          "uuid": "605c65bb-21bd-43eb-8f04-878edf508366",
           "description": "clocks with negative minute that wraps",
           "property": "equal",
           "input": {
@@ -547,6 +595,7 @@
           "expected": true
         },
         {
+          "uuid": "b87e64ed-212a-4335-91fd-56da8421d077",
           "description": "clocks with negative minute that wraps multiple times",
           "property": "equal",
           "input": {
@@ -562,6 +611,7 @@
           "expected": true
         },
         {
+          "uuid": "822fbf26-1f3b-4b13-b9bf-c914816b53dd",
           "description": "clocks with negative hours and minutes",
           "property": "equal",
           "input": {
@@ -577,6 +627,7 @@
           "expected": true
         },
         {
+          "uuid": "e787bccd-cf58-4a1d-841c-ff80eaaccfaa",
           "description": "clocks with negative hours and minutes that wrap",
           "property": "equal",
           "input": {
@@ -592,6 +643,7 @@
           "expected": true
         },
         {
+          "uuid": "96969ca8-875a-48a1-86ae-257a528c44f5",
           "description": "full clock and zeroed clock",
           "property": "equal",
           "input": {
diff --git a/exercises/collatz-conjecture/canonical-data.json b/exercises/collatz-conjecture/canonical-data.json
index 7bdb593473..d92def983e 100644
--- a/exercises/collatz-conjecture/canonical-data.json
+++ b/exercises/collatz-conjecture/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.2.1",
   "cases": [
     {
+      "uuid": "540a3d51-e7a6-47a5-92a3-4ad1838f0bfd",
       "description": "zero steps for one",
       "property": "steps",
       "input": {
@@ -11,6 +12,7 @@
       "expected": 0
     },
     {
+      "uuid": "3d76a0a6-ea84-444a-821a-f7857c2c1859",
       "description": "divide if even",
       "property": "steps",
       "input": {
@@ -19,6 +21,7 @@
       "expected": 4
     },
     {
+      "uuid": "754dea81-123c-429e-b8bc-db20b05a87b9",
       "description": "even and odd steps",
       "property": "steps",
       "input": {
@@ -27,6 +30,7 @@
       "expected": 9
     },
     {
+      "uuid": "ecfd0210-6f85-44f6-8280-f65534892ff6",
       "description": "large number of even and odd steps",
       "property": "steps",
       "input": {
@@ -35,6 +39,7 @@
       "expected": 152
     },
     {
+      "uuid": "7d4750e6-def9-4b86-aec7-9f7eb44f95a3",
       "description": "zero is an error",
       "property": "steps",
       "input": {
@@ -43,6 +48,7 @@
       "expected": { "error": "Only positive numbers are allowed" }
     },
     {
+      "uuid": "c6c795bf-a288-45e9-86a1-841359ad426d",
       "description": "negative value is an error",
       "property": "steps",
       "input": {
diff --git a/exercises/complex-numbers/canonical-data.json b/exercises/complex-numbers/canonical-data.json
index 6838bef68a..11d8d1e85d 100644
--- a/exercises/complex-numbers/canonical-data.json
+++ b/exercises/complex-numbers/canonical-data.json
@@ -16,6 +16,7 @@
       "description": "Real part",
       "cases": [
         {
+          "uuid": "9f98e133-eb7f-45b0-9676-cce001cd6f7a",
           "description": "Real part of a purely real number",
           "property": "real",
           "input": {
@@ -24,6 +25,7 @@
           "expected": 1
         },
         {
+          "uuid": "07988e20-f287-4bb7-90cf-b32c4bffe0f3",
           "description": "Real part of a purely imaginary number",
           "property": "real",
           "input": {
@@ -32,6 +34,7 @@
           "expected": 0
         },
         {
+          "uuid": "4a370e86-939e-43de-a895-a00ca32da60a",
           "description": "Real part of a number with real and imaginary part",
           "property": "real",
           "input": {
@@ -45,6 +48,7 @@
       "description": "Imaginary part",
       "cases": [
         {
+          "uuid": "9b3fddef-4c12-4a99-b8f8-e3a42c7ccef6",
           "description": "Imaginary part of a purely real number",
           "property": "imaginary",
           "input": {
@@ -53,6 +57,7 @@
           "expected": 0
         },
         {
+          "uuid": "a8dafedd-535a-4ed3-8a39-fda103a2b01e",
           "description": "Imaginary part of a purely imaginary number",
           "property": "imaginary",
           "input": {
@@ -61,6 +66,7 @@
           "expected": 1
         },
         {
+          "uuid": "0f998f19-69ee-4c64-80ef-01b086feab80",
           "description": "Imaginary part of a number with real and imaginary part",
           "property": "imaginary",
           "input":  {
@@ -71,6 +77,7 @@
       ]
     },
     {
+      "uuid": "a39b7fd6-6527-492f-8c34-609d2c913879",
       "description": "Imaginary unit",
       "property": "mul",
       "input": {
@@ -86,6 +93,7 @@
           "description": "Addition",
           "cases": [
             {
+              "uuid": "9a2c8de9-f068-4f6f-b41c-82232cc6c33e",
               "description": "Add purely real numbers",
               "property": "add",
               "input": {
@@ -95,6 +103,7 @@
               "expected": [3, 0]
             },
             {
+              "uuid": "657c55e1-b14b-4ba7-bd5c-19db22b7d659",
               "description": "Add purely imaginary numbers",
               "property": "add",
               "input": {
@@ -104,6 +113,7 @@
               "expected": [0, 3]
             },
             {
+              "uuid": "4e1395f5-572b-4ce8-bfa9-9a63056888da",
               "description": "Add numbers with real and imaginary part",
               "property": "add",
               "input": {
@@ -118,6 +128,7 @@
           "description": "Subtraction",
           "cases": [
             {
+              "uuid": "1155dc45-e4f7-44b8-af34-a91aa431475d",
               "description": "Subtract purely real numbers",
               "property": "sub",
               "input": {
@@ -127,6 +138,7 @@
               "expected": [-1, 0]
             },
             {
+              "uuid": "f95e9da8-acd5-4da4-ac7c-c861b02f774b",
               "description": "Subtract purely imaginary numbers",
               "property": "sub",
               "input": {
@@ -136,6 +148,7 @@
               "expected": [0, -1]
             },
             {
+              "uuid": "f876feb1-f9d1-4d34-b067-b599a8746400",
               "description": "Subtract numbers with real and imaginary part",
               "property": "sub",
               "input": {
@@ -150,6 +163,7 @@
           "description": "Multiplication",
           "cases": [
             {
+              "uuid": "8a0366c0-9e16-431f-9fd7-40ac46ff4ec4",
               "description": "Multiply purely real numbers",
               "property": "mul",
               "input": {
@@ -159,6 +173,7 @@
               "expected": [2, 0]
             },
             {
+              "uuid": "e560ed2b-0b80-4b4f-90f2-63cefc911aaf",
               "description": "Multiply purely imaginary numbers",
               "property": "mul",
               "input": {
@@ -168,6 +183,7 @@
               "expected": [-2, 0]
             },
             {
+              "uuid": "4d1d10f0-f8d4-48a0-b1d0-f284ada567e6",
               "description": "Multiply numbers with real and imaginary part",
               "property": "mul",
               "input": {
@@ -182,6 +198,7 @@
           "description": "Division",
           "cases": [
             {
+              "uuid": "b0571ddb-9045-412b-9c15-cd1d816d36c1",
               "description": "Divide purely real numbers",
               "property": "div",
               "input": {
@@ -191,6 +208,7 @@
               "expected": [0.5, 0]
             },
             {
+              "uuid": "5bb4c7e4-9934-4237-93cc-5780764fdbdd",
               "description": "Divide purely imaginary numbers",
               "property": "div",
               "input": {
@@ -200,6 +218,7 @@
               "expected": [0.5, 0]
             },
             {
+              "uuid": "c4e7fef5-64ac-4537-91c2-c6529707701f",
               "description": "Divide numbers with real and imaginary part",
               "property": "div",
               "input": {
@@ -216,6 +235,7 @@
       "description": "Absolute value",
       "cases": [
         {
+          "uuid": "c56a7332-aad2-4437-83a0-b3580ecee843",
           "description": "Absolute value of a positive purely real number",
           "property": "abs",
           "input": {
@@ -224,6 +244,7 @@
           "expected": 5
         },
         {
+          "uuid": "cf88d7d3-ee74-4f4e-8a88-a1b0090ecb0c",
           "description": "Absolute value of a negative purely real number",
           "property": "abs",
           "input": {
@@ -232,6 +253,7 @@
           "expected": 5
         },
         {
+          "uuid": "bbe26568-86c1-4bb4-ba7a-da5697e2b994",
           "description": "Absolute value of a purely imaginary number with positive imaginary part",
           "property": "abs",
           "input": {
@@ -240,6 +262,7 @@
           "expected": 5
         },
         {
+          "uuid": "3b48233d-468e-4276-9f59-70f4ca1f26f3",
           "description": "Absolute value of a purely imaginary number with negative imaginary part",
           "property": "abs",
           "input": {
@@ -248,6 +271,7 @@
           "expected": 5
         },
         {
+          "uuid": "fe400a9f-aa22-4b49-af92-51e0f5a2a6d3",
           "description": "Absolute value of a number with real and imaginary part",
           "property": "abs",
           "input": {
@@ -261,6 +285,7 @@
       "description": "Complex conjugate",
       "cases": [
         {
+          "uuid": "fb2d0792-e55a-4484-9443-df1eddfc84a2",
           "description": "Conjugate a purely real number",
           "property": "conjugate",
           "input": {
@@ -269,6 +294,7 @@
           "expected": [5, 0]
         },
         {
+          "uuid": "e37fe7ac-a968-4694-a460-66cb605f8691",
           "description": "Conjugate a purely imaginary number",
           "property": "conjugate",
           "input": {
@@ -277,6 +303,7 @@
           "expected": [0, -5]
         },
         {
+          "uuid": "f7704498-d0be-4192-aaf5-a1f3a7f43e68",
           "description": "Conjugate a number with real and imaginary part",
           "property": "conjugate",
           "input": {
@@ -301,6 +328,7 @@
       ],
       "cases": [
         {
+          "uuid": "6d96d4c6-2edb-445b-94a2-7de6d4caaf60",
           "description": "Euler's identity/formula",
           "property": "exp",
           "input":  {
@@ -309,6 +337,7 @@
           "expected": [-1, 0]
         },
         {
+          "uuid": "2d2c05a0-4038-4427-a24d-72f6624aa45f",
           "description": "Exponential of 0",
           "property": "exp",
           "input": {
@@ -317,6 +346,7 @@
           "expected": [1, 0]
         },
         {
+          "uuid": "ed87f1bd-b187-45d6-8ece-7e331232c809",
           "description": "Exponential of a purely real number",
           "property": "exp",
           "input": {
@@ -325,6 +355,7 @@
           "expected": ["e", 0]
         },
         {
+          "uuid": "08eedacc-5a95-44fc-8789-1547b27a8702",
           "description": "Exponential of a number with real and imaginary part",
           "property": "exp",
           "input": {
diff --git a/exercises/connect/canonical-data.json b/exercises/connect/canonical-data.json
index 61d0beccb4..26bea0afae 100644
--- a/exercises/connect/canonical-data.json
+++ b/exercises/connect/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "6eff0df4-3e92-478d-9b54-d3e8b354db56",
       "description": "an empty board has no winner",
       "property": "winner",
       "input": {
@@ -17,6 +18,7 @@
       "expected": ""
     },
     {
+      "uuid": "298b94c0-b46d-45d8-b34b-0fa2ea71f0a4",
       "description": "X can win on a 1x1 board",
       "property": "winner",
       "input": {
@@ -27,6 +29,7 @@
       "expected": "X"
     },
     {
+      "uuid": "763bbae0-cb8f-4f28-bc21-5be16a5722dc",
       "description": "O can win on a 1x1 board",
       "property": "winner",
       "input": {
@@ -37,6 +40,7 @@
       "expected": "O"
     },
     {
+      "uuid": "819fde60-9ae2-485e-a024-cbb8ea68751b",
       "description": "only edges does not make a winner",
       "property": "winner",
       "input": {
@@ -50,6 +54,7 @@
       "expected": ""
     },
     {
+      "uuid": "2c56a0d5-9528-41e5-b92b-499dfe08506c",
       "description": "illegal diagonal does not make a winner",
       "property": "winner",
       "input": {
@@ -64,6 +69,7 @@
       "expected": ""
     },
     {
+      "uuid": "41cce3ef-43ca-4963-970a-c05d39aa1cc1",
       "description": "nobody wins crossing adjacent angles",
       "property": "winner",
       "input": {
@@ -78,6 +84,7 @@
       "expected": ""
     },
     {
+      "uuid": "cd61c143-92f6-4a8d-84d9-cb2b359e226b",
       "description": "X wins crossing from left to right",
       "property": "winner",
       "input": {
@@ -92,6 +99,7 @@
       "expected": "X"
     },
     {
+      "uuid": "73d1eda6-16ab-4460-9904-b5f5dd401d0b",
       "description": "O wins crossing from top to bottom",
       "property": "winner",
       "input": {
@@ -106,6 +114,7 @@
       "expected": "O"
     },
     {
+      "uuid": "c3a2a550-944a-4637-8b3f-1e1bf1340a3d",
       "description": "X wins using a convoluted path",
       "property": "winner",
       "input": {
@@ -120,6 +129,7 @@
       "expected": "X"
     },
     {
+      "uuid": "17e76fa8-f731-4db7-92ad-ed2a285d31f3",
       "description": "X wins using a spiral path",
       "property": "winner",
       "input": {
@@ -138,4 +148,4 @@
       "expected": "X"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/crypto-square/canonical-data.json b/exercises/crypto-square/canonical-data.json
index b2814e2e52..5cc7a3a27e 100644
--- a/exercises/crypto-square/canonical-data.json
+++ b/exercises/crypto-square/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "3.2.0",
   "cases": [
     {
+      "uuid": "407c3837-9aa7-4111-ab63-ec54b58e8e9f",
       "description": "empty plaintext results in an empty ciphertext",
       "property": "ciphertext",
       "input": {
@@ -11,6 +12,7 @@
       "expected": ""
     },
     {
+      "uuid": "64131d65-6fd9-4f58-bdd8-4a2370fb481d",
       "description": "Lowercase",
       "property": "ciphertext",
       "input": {
@@ -19,6 +21,7 @@
       "expected": "a"
     },
     {
+      "uuid": "63a4b0ed-1e3c-41ea-a999-f6f26ba447d6",
       "description": "Remove spaces",
       "property": "ciphertext",
       "input": {
@@ -27,6 +30,7 @@
       "expected": "b"
     },
     {
+      "uuid": "1b5348a1-7893-44c1-8197-42d48d18756c",
       "description": "Remove punctuation",
       "property": "ciphertext",
       "input": {
@@ -35,6 +39,7 @@
       "expected": "1"
     },
     {
+      "uuid": "8574a1d3-4a08-4cec-a7c7-de93a164f41a",
       "description": "9 character plaintext results in 3 chunks of 3 characters",
       "property": "ciphertext",
       "input": {
@@ -43,6 +48,7 @@
       "expected": "tsf hiu isn"
     },
     {
+      "uuid": "a65d3fa1-9e09-43f9-bcec-7a672aec3eae",
       "description": "8 character plaintext results in 3 chunks, the last one with a trailing space",
       "property": "ciphertext",
       "input": {
@@ -51,6 +57,7 @@
       "expected": "clu hlt io "
     },
     {
+      "uuid": "fbcb0c6d-4c39-4a31-83f6-c473baa6af80",
       "description": "54 character plaintext results in 7 chunks, the last two with trailing spaces",
       "property": "ciphertext",
       "input": {
@@ -59,4 +66,4 @@
       "expected": "imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn  sseoau "
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/custom-set/canonical-data.json b/exercises/custom-set/canonical-data.json
index 7666506198..69a4027f80 100644
--- a/exercises/custom-set/canonical-data.json
+++ b/exercises/custom-set/canonical-data.json
@@ -16,6 +16,7 @@
       "description": "Returns true if the set contains no elements",
       "cases": [
         {
+          "uuid": "20c5f855-f83a-44a7-abdd-fe75c6cf022b",
           "description": "sets with no elements are empty",
           "property": "empty",
           "input": {
@@ -24,6 +25,7 @@
           "expected": true
         },
         {
+          "uuid": "d506485d-5706-40db-b7d8-5ceb5acf88d2",
           "description": "sets with elements are not empty",
           "property": "empty",
           "input": {
@@ -37,6 +39,7 @@
       "description": "Sets can report if they contain an element",
       "cases": [
         {
+          "uuid": "759b9740-3417-44c3-8ca3-262b3c281043",
           "description": "nothing is contained in an empty set",
           "property": "contains",
           "input": {
@@ -46,6 +49,7 @@
           "expected": false
         },
         {
+          "uuid": "f83cd2d1-2a85-41bc-b6be-80adbff4be49",
           "description": "when the element is in the set",
           "property": "contains",
           "input": {
@@ -55,6 +59,7 @@
           "expected": true
         },
         {
+          "uuid": "93423fc0-44d0-4bc0-a2ac-376de8d7af34",
           "description": "when the element is not in the set",
           "property": "contains",
           "input": {
@@ -69,6 +74,7 @@
       "description": "A set is a subset if all of its elements are contained in the other set",
       "cases": [
         {
+          "uuid": "c392923a-637b-4495-b28e-34742cd6157a",
           "description": "empty set is a subset of another empty set",
           "property": "subset",
           "input": {
@@ -78,6 +84,7 @@
           "expected": true
         },
         {
+          "uuid": "5635b113-be8c-4c6f-b9a9-23c485193917",
           "description": "empty set is a subset of non-empty set",
           "property": "subset",
           "input": {
@@ -87,6 +94,7 @@
           "expected": true
         },
         {
+          "uuid": "832eda58-6d6e-44e2-92c2-be8cf0173cee",
           "description": "non-empty set is not a subset of empty set",
           "property": "subset",
           "input": {
@@ -96,6 +104,7 @@
           "expected": false
         },
         {
+          "uuid": "c830c578-8f97-4036-b082-89feda876131",
           "description": "set is a subset of set with exact same elements",
           "property": "subset",
           "input": {
@@ -105,6 +114,7 @@
           "expected": true
         },
         {
+          "uuid": "476a4a1c-0fd1-430f-aa65-5b70cbc810c5",
           "description": "set is a subset of larger set with same elements",
           "property": "subset",
           "input": {
@@ -114,6 +124,7 @@
           "expected": true
         },
         {
+          "uuid": "d2498999-3e46-48e4-9660-1e20c3329d3d",
           "description": "set is not a subset of set that does not contain its elements",
           "property": "subset",
           "input": {
@@ -128,6 +139,7 @@
       "description": "Sets are disjoint if they share no elements",
       "cases": [
         {
+          "uuid": "7d38155e-f472-4a7e-9ad8-5c1f8f95e4cc",
           "description": "the empty set is disjoint with itself",
           "property": "disjoint",
           "input": {
@@ -137,6 +149,7 @@
           "expected": true
         },
         {
+          "uuid": "7a2b3938-64b6-4b32-901a-fe16891998a6",
           "description": "empty set is disjoint with non-empty set",
           "property": "disjoint",
           "input": {
@@ -146,6 +159,7 @@
           "expected": true
         },
         {
+          "uuid": "589574a0-8b48-48ea-88b0-b652c5fe476f",
           "description": "non-empty set is disjoint with empty set",
           "property": "disjoint",
           "input": {
@@ -155,6 +169,7 @@
           "expected": true
         },
         {
+          "uuid": "febeaf4f-f180-4499-91fa-59165955a523",
           "description": "sets are not disjoint if they share an element",
           "property": "disjoint",
           "input": {
@@ -164,6 +179,7 @@
           "expected": false
         },
         {
+          "uuid": "0de20d2f-c952-468a-88c8-5e056740f020",
           "description": "sets are disjoint if they share no elements",
           "property": "disjoint",
           "input": {
@@ -178,6 +194,7 @@
       "description": "Sets with the same elements are equal",
       "cases": [
         {
+          "uuid": "4bd24adb-45da-4320-9ff6-38c044e9dff8",
           "description": "empty sets are equal",
           "property": "equal",
           "input": {
@@ -187,6 +204,7 @@
           "expected": true
         },
         {
+          "uuid": "f65c0a0e-6632-4b2d-b82c-b7c6da2ec224",
           "description": "empty set is not equal to non-empty set",
           "property": "equal",
           "input": {
@@ -196,6 +214,7 @@
           "expected": false
         },
         {
+          "uuid": "81e53307-7683-4b1e-a30c-7e49155fe3ca",
           "description": "non-empty set is not equal to empty set",
           "property": "equal",
           "input": {
@@ -205,6 +224,7 @@
           "expected": false
         },
         {
+          "uuid": "d57c5d7c-a7f3-48cc-a162-6b488c0fbbd0",
           "description": "sets with the same elements are equal",
           "property": "equal",
           "input": {
@@ -214,6 +234,7 @@
           "expected": true
         },
         {
+          "uuid": "dd61bafc-6653-42cc-961a-ab071ee0ee85",
           "description": "sets with different elements are not equal",
           "property": "equal",
           "input": {
@@ -223,6 +244,7 @@
           "expected": false
         },
         {
+          "uuid": "06059caf-9bf4-425e-aaff-88966cb3ea14",
           "description": "set is not equal to larger set with same elements",
           "property": "equal",
           "input": {
@@ -237,6 +259,7 @@
       "description": "Unique elements can be added to a set",
       "cases": [
         {
+          "uuid": "8a677c3c-a658-4d39-bb88-5b5b1a9659f4",
           "description": "add to empty set",
           "property": "add",
           "input": {
@@ -246,6 +269,7 @@
           "expected": [3]
         },
         {
+          "uuid": "0903dd45-904d-4cf2-bddd-0905e1a8d125",
           "description": "add to non-empty set",
           "property": "add",
           "input": {
@@ -255,6 +279,7 @@
           "expected": [1, 2, 3, 4]
         },
         {
+          "uuid": "b0eb7bb7-5e5d-4733-b582-af771476cb99",
           "description": "adding an existing element does not change the set",
           "property": "add",
           "input": {
@@ -269,6 +294,7 @@
       "description": "Intersection returns a set of all shared elements",
       "cases": [
         {
+          "uuid": "893d5333-33b8-4151-a3d4-8f273358208a",
           "description": "intersection of two empty sets is an empty set",
           "property": "intersection",
           "input": {
@@ -278,6 +304,7 @@
           "expected": []
         },
         {
+          "uuid": "d739940e-def2-41ab-a7bb-aaf60f7d782c",
           "description": "intersection of an empty set and non-empty set is an empty set",
           "property": "intersection",
           "input": {
@@ -287,6 +314,7 @@
           "expected": []
         },
         {
+          "uuid": "3607d9d8-c895-4d6f-ac16-a14956e0a4b7",
           "description": "intersection of a non-empty set and an empty set is an empty set",
           "property": "intersection",
           "input": {
@@ -296,6 +324,7 @@
           "expected": []
         },
         {
+          "uuid": "b5120abf-5b5e-41ab-aede-4de2ad85c34e",
           "description": "intersection of two sets with no shared elements is an empty set",
           "property": "intersection",
           "input": {
@@ -305,6 +334,7 @@
           "expected": []
         },
         {
+          "uuid": "af21ca1b-fac9-499c-81c0-92a591653d49",
           "description": "intersection of two sets with shared elements is a set of the shared elements",
           "property": "intersection",
           "input": {
@@ -319,6 +349,7 @@
       "description": "Difference (or Complement) of a set is a set of all elements that are only in the first set",
       "cases": [
         {
+          "uuid": "c5e6e2e4-50e9-4bc2-b89f-c518f015b57e",
           "description": "difference of two empty sets is an empty set",
           "property": "difference",
           "input": {
@@ -328,6 +359,7 @@
           "expected": []
         },
         {
+          "uuid": "2024cc92-5c26-44ed-aafd-e6ca27d6fcd2",
           "description": "difference of empty set and non-empty set is an empty set",
           "property": "difference",
           "input": {
@@ -337,6 +369,7 @@
           "expected": []
         },
         {
+          "uuid": "e79edee7-08aa-4c19-9382-f6820974b43e",
           "description": "difference of a non-empty set and an empty set is the non-empty set",
           "property": "difference",
           "input": {
@@ -346,6 +379,7 @@
           "expected": [1, 2, 3, 4]
         },
         {
+          "uuid": "c5ac673e-d707-4db5-8d69-7082c3a5437e",
           "description": "difference of two non-empty sets is a set of elements that are only in the first set",
           "property": "difference",
           "input": {
@@ -360,6 +394,7 @@
       "description": "Union returns a set of all elements in either set",
       "cases": [
         {
+          "uuid": "c45aed16-5494-455a-9033-5d4c93589dc6",
           "description": "union of empty sets is an empty set",
           "property": "union",
           "input": {
@@ -369,6 +404,7 @@
           "expected": []
         },
         {
+          "uuid": "9d258545-33c2-4fcb-a340-9f8aa69e7a41",
           "description": "union of an empty set and non-empty set is the non-empty set",
           "property": "union",
           "input": {
@@ -378,6 +414,7 @@
           "expected": [2]
         },
         {
+          "uuid": "3aade50c-80c7-4db8-853d-75bac5818b83",
           "description": "union of a non-empty set and empty set is the non-empty set",
           "property": "union",
           "input": {
@@ -387,6 +424,7 @@
           "expected": [1, 3]
         },
         {
+          "uuid": "a00bb91f-c4b4-4844-8f77-c73e2e9df77c",
           "description": "union of non-empty sets contains all unique elements",
           "property": "union",
           "input": {
diff --git a/exercises/darts/canonical-data.json b/exercises/darts/canonical-data.json
index 22e94a52d2..3d28f93fc1 100644
--- a/exercises/darts/canonical-data.json
+++ b/exercises/darts/canonical-data.json
@@ -6,6 +6,7 @@
   ],
   "cases": [
     {
+      "uuid": "9033f731-0a3a-4d9c-b1c0-34a1c8362afb",
       "property": "score",
       "description": "Missed target",
       "input": {
@@ -15,6 +16,7 @@
       "expected": 0
     },
     {
+      "uuid": "4c9f6ff4-c489-45fd-be8a-1fcb08b4d0ba",
       "property": "score",
       "description": "On the outer circle",
       "input": {
@@ -24,6 +26,7 @@
       "expected": 1
     },
     {
+      "uuid": "14378687-ee58-4c9b-a323-b089d5274be8",
       "property": "score",
       "description": "On the middle circle",
       "input": {
@@ -33,6 +36,7 @@
       "expected": 5
     },
     {
+      "uuid": "849e2e63-85bd-4fed-bc3b-781ae962e2c9",
       "property": "score",
       "description": "On the inner circle",
       "input": {
@@ -42,6 +46,7 @@
       "expected": 10
     },
     {
+      "uuid": "1c5ffd9f-ea66-462f-9f06-a1303de5a226",
       "property": "score",
       "description": "Exactly on centre",
       "input": {
@@ -51,6 +56,7 @@
       "expected": 10
     },
     {
+      "uuid": "b65abce3-a679-4550-8115-4b74bda06088",
       "property": "score",
       "description": "Near the centre",
       "input": {
@@ -60,6 +66,7 @@
       "expected": 10
     },
     {
+      "uuid": "66c29c1d-44f5-40cf-9927-e09a1305b399",
       "property": "score",
       "description": "Just within the inner circle",
       "input": {
@@ -69,6 +76,7 @@
       "expected": 10
     },
     {
+      "uuid": "d1012f63-c97c-4394-b944-7beb3d0b141a",
       "property": "score",
       "description": "Just outside the inner circle",
       "input": {
@@ -78,6 +86,7 @@
       "expected": 5
     },
     {
+      "uuid": "ab2b5666-b0b4-49c3-9b27-205e790ed945",
       "property": "score",
       "description": "Just within the middle circle",
       "input": {
@@ -87,6 +96,7 @@
       "expected": 5
     },
     {
+      "uuid": "70f1424e-d690-4860-8caf-9740a52c0161",
       "property": "score",
       "description": "Just outside the middle circle",
       "input": {
@@ -96,6 +106,7 @@
       "expected": 1
     },
     {
+      "uuid": "a7dbf8db-419c-4712-8a7f-67602b69b293",
       "property": "score",
       "description": "Just within the outer circle",
       "input": {
@@ -105,6 +116,7 @@
       "expected": 1
     },
     {
+      "uuid": "e0f39315-9f9a-4546-96e4-a9475b885aa7",
       "property": "score",
       "description": "Just outside the outer circle",
       "input": {
@@ -114,6 +126,7 @@
       "expected": 0
     },
     {
+      "uuid": "045d7d18-d863-4229-818e-b50828c75d19",
       "property": "score",
       "description": "Asymmetric position between the inner and middle circles",
       "input": {
diff --git a/exercises/diamond/canonical-data.json b/exercises/diamond/canonical-data.json
index 12d794cc92..2e46c7ed4c 100644
--- a/exercises/diamond/canonical-data.json
+++ b/exercises/diamond/canonical-data.json
@@ -20,6 +20,7 @@
     ],
     "cases": [
         {
+            "uuid": "202fb4cc-6a38-4883-9193-a29d5cb92076",
             "description": "Degenerate case with a single 'A' row",
             "property": "rows",
             "input": {
@@ -30,6 +31,7 @@
             ]
         },
         {
+            "uuid": "bd6a6d78-9302-42e9-8f60-ac1461e9abae",
             "description": "Degenerate case with no row containing 3 distinct groups of spaces",
             "property": "rows",
             "input": {
@@ -42,6 +44,7 @@
             ]
         },
         {
+            "uuid": "af8efb49-14ed-447f-8944-4cc59ce3fd76",
             "description": "Smallest non-degenerate case with odd diamond side length",
             "property": "rows",
             "input": {
@@ -56,6 +59,7 @@
             ]
         },
         {
+            "uuid": "e0c19a95-9888-4d05-86a0-fa81b9e70d1d",
             "description": "Smallest non-degenerate case with even diamond side length",
             "property": "rows",
             "input": {
@@ -72,6 +76,7 @@
             ]
         },
         {
+            "uuid": "82ea9aa9-4c0e-442a-b07e-40204e925944",
             "description": "Largest possible diamond",
             "property": "rows",
             "input": {
@@ -132,4 +137,4 @@
             ]
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/exercises/difference-of-squares/canonical-data.json b/exercises/difference-of-squares/canonical-data.json
index ec7f78e2b6..5bb161e0c5 100644
--- a/exercises/difference-of-squares/canonical-data.json
+++ b/exercises/difference-of-squares/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "Square the sum of the numbers up to the given number",
       "cases": [
         {
+          "uuid": "e46c542b-31fc-4506-bcae-6b62b3268537",
           "description": "square of sum 1",
           "property": "squareOfSum",
           "input": {
@@ -14,6 +15,7 @@
           "expected": 1
         },
         {
+          "uuid": "9b3f96cb-638d-41ee-99b7-b4f9c0622948",
           "description": "square of sum 5",
           "property": "squareOfSum",
           "input": {
@@ -22,6 +24,7 @@
           "expected": 225
         },
         {
+          "uuid": "54ba043f-3c35-4d43-86ff-3a41625d5e86",
           "description": "square of sum 100",
           "property": "squareOfSum",
           "input": {
@@ -35,6 +38,7 @@
       "description": "Sum the squares of the numbers up to the given number",
       "cases": [
         {
+          "uuid": "01d84507-b03e-4238-9395-dd61d03074b5",
           "description": "sum of squares 1",
           "property": "sumOfSquares",
           "input": {
@@ -43,6 +47,7 @@
           "expected": 1
         },
         {
+          "uuid": "c93900cd-8cc2-4ca4-917b-dd3027023499",
           "description": "sum of squares 5",
           "property": "sumOfSquares",
           "input": {
@@ -51,6 +56,7 @@
           "expected": 55
         },
         {
+          "uuid": "94807386-73e4-4d9e-8dec-69eb135b19e4",
           "description": "sum of squares 100",
           "property": "sumOfSquares",
           "input": {
@@ -64,6 +70,7 @@
       "description": "Subtract sum of squares from square of sums",
       "cases": [
         {
+          "uuid": "44f72ae6-31a7-437f-858d-2c0837adabb6",
           "description": "difference of squares 1",
           "property": "differenceOfSquares",
           "input": {
@@ -72,6 +79,7 @@
           "expected": 0
         },
         {
+          "uuid": "005cb2bf-a0c8-46f3-ae25-924029f8b00b",
           "description": "difference of squares 5",
           "property": "differenceOfSquares",
           "input": {
@@ -80,6 +88,7 @@
           "expected": 170
         },
         {
+          "uuid": "b1bf19de-9a16-41c0-a62b-1f02ecc0b036",
           "description": "difference of squares 100",
           "property": "differenceOfSquares",
           "input": {
@@ -90,4 +99,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/diffie-hellman/canonical-data.json b/exercises/diffie-hellman/canonical-data.json
index 806c3523c3..cc0ee662d0 100644
--- a/exercises/diffie-hellman/canonical-data.json
+++ b/exercises/diffie-hellman/canonical-data.json
@@ -17,6 +17,7 @@
   ],
   "cases": [
     {
+      "uuid": "1b97bf38-4307-418e-bfd2-446ffc77588d",
       "description": "private key is in range 1 .. p",
       "property": "privateKeyIsInRange",
       "input": {},
@@ -26,6 +27,7 @@
       }
     },
     {
+      "uuid": "68b2a5f7-7755-44c3-97b2-d28d21f014a9",
       "description": "private key is random",
       "property": "privateKeyIsRandom",
       "input": {},
@@ -34,6 +36,7 @@
       }
     },
     {
+      "uuid": "b4161d8e-53a1-4241-ae8f-48cc86527f22",
       "description": "can calculate public key using private key",
       "property": "publicKey",
       "input": {
@@ -44,6 +47,7 @@
       "expected": 8
     },
     {
+      "uuid": "cd02ad45-3f52-4510-99cc-5161dad948a8",
       "description": "can calculate secret using other party's public key",
       "property": "secret",
       "input": {
@@ -54,6 +58,7 @@
       "expected": 2
     },
     {
+      "uuid": "17f13c61-a111-4075-9a1f-c2d4636dfa60",
       "description": "key exchange",
       "property": "keyExchange",
       "input": {
diff --git a/exercises/dnd-character/canonical-data.json b/exercises/dnd-character/canonical-data.json
index 3eccb04711..5ceb426cf0 100644
--- a/exercises/dnd-character/canonical-data.json
+++ b/exercises/dnd-character/canonical-data.json
@@ -23,6 +23,7 @@
       "description": "ability modifier",
       "cases": [
         {
+          "uuid": "1e9ae1dc-35bd-43ba-aa08-e4b94c20fa37",
           "description": "ability modifier for score 3 is -4",
           "property": "modifier",
           "input": {
@@ -31,6 +32,7 @@
           "expected": -4
         },
         {
+          "uuid": "cc9bb24e-56b8-4e9e-989d-a0d1a29ebb9c",
           "description": "ability modifier for score 4 is -3",
           "property": "modifier",
           "input": {
@@ -39,6 +41,7 @@
           "expected": -3
         },
         {
+          "uuid": "5b519fcd-6946-41ee-91fe-34b4f9808326",
           "description": "ability modifier for score 5 is -3",
           "property": "modifier",
           "input": {
@@ -47,6 +50,7 @@
           "expected": -3
         },
         {
+          "uuid": "dc2913bd-6d7a-402e-b1e2-6d568b1cbe21",
           "description": "ability modifier for score 6 is -2",
           "property": "modifier",
           "input": {
@@ -55,6 +59,7 @@
           "expected": -2
         },
         {
+          "uuid": "099440f5-0d66-4b1a-8a10-8f3a03cc499f",
           "description": "ability modifier for score 7 is -2",
           "property": "modifier",
           "input": {
@@ -63,6 +68,7 @@
           "expected": -2
         },
         {
+          "uuid": "cfda6e5c-3489-42f0-b22b-4acb47084df0",
           "description": "ability modifier for score 8 is -1",
           "property": "modifier",
           "input": {
@@ -71,6 +77,7 @@
           "expected": -1
         },
         {
+          "uuid": "c70f0507-fa7e-4228-8463-858bfbba1754",
           "description": "ability modifier for score 9 is -1",
           "property": "modifier",
           "input": {
@@ -79,6 +86,7 @@
           "expected": -1
         },
         {
+          "uuid": "6f4e6c88-1cd9-46a0-92b8-db4a99b372f7",
           "description": "ability modifier for score 10 is 0",
           "property": "modifier",
           "input": {
@@ -87,6 +95,7 @@
           "expected": 0
         },
         {
+          "uuid": "e00d9e5c-63c8-413f-879d-cd9be9697097",
           "description": "ability modifier for score 11 is 0",
           "property": "modifier",
           "input": {
@@ -95,6 +104,7 @@
           "expected": 0
         },
         {
+          "uuid": "eea06f3c-8de0-45e7-9d9d-b8cab4179715",
           "description": "ability modifier for score 12 is +1",
           "property": "modifier",
           "input": {
@@ -103,6 +113,7 @@
           "expected": 1
         },
         {
+          "uuid": "9c51f6be-db72-4af7-92ac-b293a02c0dcd",
           "description": "ability modifier for score 13 is +1",
           "property": "modifier",
           "input": {
@@ -111,6 +122,7 @@
           "expected": 1
         },
         {
+          "uuid": "94053a5d-53b6-4efc-b669-a8b5098f7762",
           "description": "ability modifier for score 14 is +2",
           "property": "modifier",
           "input": {
@@ -119,6 +131,7 @@
           "expected": 2
         },
         {
+          "uuid": "8c33e7ca-3f9f-4820-8ab3-65f2c9e2f0e2",
           "description": "ability modifier for score 15 is +2",
           "property": "modifier",
           "input": {
@@ -127,6 +140,7 @@
           "expected": 2
         },
         {
+          "uuid": "c3ec871e-1791-44d0-b3cc-77e5fb4cd33d",
           "description": "ability modifier for score 16 is +3",
           "property": "modifier",
           "input": {
@@ -135,6 +149,7 @@
           "expected": 3
         },
         {
+          "uuid": "3d053cee-2888-4616-b9fd-602a3b1efff4",
           "description": "ability modifier for score 17 is +3",
           "property": "modifier",
           "input": {
@@ -143,6 +158,7 @@
           "expected": 3
         },
         {
+          "uuid": "bafd997a-e852-4e56-9f65-14b60261faee",
           "description": "ability modifier for score 18 is +4",
           "property": "modifier",
           "input": {
@@ -153,12 +169,14 @@
       ]
     },
     {
+      "uuid": "4f28f19c-2e47-4453-a46a-c0d365259c14",
       "description": "random ability is within range",
       "property": "ability",
       "input": {},
       "expected": "score >= 3 && score <= 18"
     },
     {
+      "uuid": "385d7e72-864f-4e88-8279-81a7d75b04ad",
       "description": "random character is valid",
       "property": "character",
       "input": {},
@@ -173,6 +191,7 @@
       }
     },
     {
+      "uuid": "2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe",
       "description": "each ability is only calculated once",
       "property": "strength",
       "input": {},
diff --git a/exercises/dominoes/canonical-data.json b/exercises/dominoes/canonical-data.json
index 190ee3ea80..e593ebbf05 100644
--- a/exercises/dominoes/canonical-data.json
+++ b/exercises/dominoes/canonical-data.json
@@ -38,6 +38,7 @@
   ],
   "cases": [
     {
+      "uuid": "31a673f2-5e54-49fe-bd79-1c1dae476c9c",
       "description": "empty input = empty output",
       "property": "canChain",
       "input": {
@@ -46,6 +47,7 @@
       "expected": true
     },
     {
+      "uuid": "4f99b933-367b-404b-8c6d-36d5923ee476",
       "description": "singleton input = singleton output",
       "property": "canChain",
       "input": {
@@ -54,6 +56,7 @@
       "expected": true
     },
     {
+      "uuid": "91122d10-5ec7-47cb-b759-033756375869",
       "description": "singleton that can't be chained",
       "property": "canChain",
       "input": {
@@ -62,6 +65,7 @@
       "expected": false
     },
     {
+      "uuid": "be8bc26b-fd3d-440b-8e9f-d698a0623be3",
       "description": "three elements",
       "property": "canChain",
       "input": {
@@ -70,6 +74,7 @@
       "expected": true
     },
     {
+      "uuid": "99e615c6-c059-401c-9e87-ad7af11fea5c",
       "description": "can reverse dominoes",
       "property": "canChain",
       "input": {
@@ -78,6 +83,7 @@
       "expected": true
     },
     {
+      "uuid": "51f0c291-5d43-40c5-b316-0429069528c9",
       "description": "can't be chained",
       "property": "canChain",
       "input": {
@@ -86,6 +92,7 @@
       "expected": false
     },
     {
+      "uuid": "9a75e078-a025-4c23-8c3a-238553657f39",
       "description": "disconnected - simple",
       "comments": [
         "This meets the requirement of being possibly-Euclidean.",
@@ -101,6 +108,7 @@
       "expected": false
     },
     {
+      "uuid": "0da0c7fe-d492-445d-b9ef-1f111f07a301",
       "description": "disconnected - double loop",
       "property": "canChain",
       "input": {
@@ -109,6 +117,7 @@
       "expected": false
     },
     {
+      "uuid": "b6087ff0-f555-4ea0-a71c-f9d707c5994a",
       "description": "disconnected - single isolated",
       "property": "canChain",
       "input": {
@@ -117,6 +126,7 @@
       "expected": false
     },
     {
+      "uuid": "2174fbdc-8b48-4bac-9914-8090d06ef978",
       "description": "need backtrack",
       "comments": [
         "Some solutions may make a chain out of (1, 2), (2, 3), (3, 1)",
@@ -132,6 +142,7 @@
       "expected": true
     },
     {
+      "uuid": "167bb480-dfd1-4318-a20d-4f90adb4a09f",
       "description": "separate loops",
       "property": "canChain",
       "input": {
@@ -140,6 +151,7 @@
       "expected": true
     },
     {
+      "uuid": "cd061538-6046-45a7-ace9-6708fe8f6504",
       "description": "nine elements",
       "property": "canChain",
       "input": {
diff --git a/exercises/etl/canonical-data.json b/exercises/etl/canonical-data.json
index 2bec9a18ba..9d7df7822b 100644
--- a/exercises/etl/canonical-data.json
+++ b/exercises/etl/canonical-data.json
@@ -15,6 +15,7 @@
       "description": "Transform legacy to new",
       "cases": [
         {
+          "uuid": "78a7a9f9-4490-4a47-8ee9-5a38bb47d28f",
           "description": "single letter",
           "property": "transform",
           "input": {
@@ -27,6 +28,7 @@
           }
         },
         {
+          "uuid": "60dbd000-451d-44c7-bdbb-97c73ac1f497",
           "description": "single score with multiple letters",
           "property": "transform",
           "input": {
@@ -43,6 +45,7 @@
           }
         },
         {
+          "uuid": "f5c5de0c-301f-4fdd-a0e5-df97d4214f54",
           "description": "multiple scores with multiple letters",
           "property": "transform",
           "input": {
@@ -59,6 +62,7 @@
           }
         },
         {
+          "uuid": "5db8ea89-ecb4-4dcd-902f-2b418cc87b9d",
           "description": "multiple scores with differing numbers of letters",
           "property": "transform",
           "input": {
diff --git a/exercises/flatten-array/canonical-data.json b/exercises/flatten-array/canonical-data.json
index a7a625073d..8b7181a70f 100644
--- a/exercises/flatten-array/canonical-data.json
+++ b/exercises/flatten-array/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.2.0",
   "cases": [
     {
+      "uuid": "d268b919-963c-442d-9f07-82b93f1b518c",
       "description": "no nesting",
       "property": "flatten",
       "input": {
@@ -11,6 +12,7 @@
       "expected": [0, 1, 2]
     },
     {
+      "uuid": "c84440cc-bb3a-48a6-862c-94cf23f2815d",
       "description": "flattens array with just integers present",
       "property": "flatten",
       "input": {
@@ -19,6 +21,7 @@
       "expected": [1, 2, 3, 4, 5, 6, 7, 8]
     },
     {
+      "uuid": "d3d99d39-6be5-44f5-a31d-6037d92ba34f",
       "description": "5 level nesting",
       "property": "flatten",
       "input": {
@@ -27,6 +30,7 @@
       "expected": [0, 2, 2, 3, 8, 100, 4, 50, -2]
     },
     {
+      "uuid": "d572bdba-c127-43ed-bdcd-6222ac83d9f7",
       "description": "6 level nesting",
       "property": "flatten",
       "input": {
@@ -35,6 +39,7 @@
       "expected": [1, 2, 3, 4, 5, 6, 7, 8]
     },
     {
+      "uuid": "ef1d4790-1b1e-4939-a179-51ace0829dbd",
       "description": "6 level nest list with null values",
       "property": "flatten",
       "input": {
@@ -43,6 +48,7 @@
       "expected": [0, 2, 2, 3, 8, 100, -2]
     },
     {
+      "uuid": "85721643-705a-4150-93ab-7ae398e2942d",
       "description": "all values in nested list are null",
       "property": "flatten",
       "input": {
diff --git a/exercises/food-chain/canonical-data.json b/exercises/food-chain/canonical-data.json
index e9a4a31ef2..81f84218bc 100644
--- a/exercises/food-chain/canonical-data.json
+++ b/exercises/food-chain/canonical-data.json
@@ -16,6 +16,7 @@
       "description": "Return specified verse or series of verses",
       "cases": [
         {
+          "uuid": "751dce68-9412-496e-b6e8-855998c56166",
           "description": "fly",
           "property": "recite",
           "input": {
@@ -28,6 +29,7 @@
           ]
         },
         {
+          "uuid": "6c56f861-0c5e-4907-9a9d-b2efae389379",
           "description": "spider",
           "property": "recite",
           "input": {
@@ -42,6 +44,7 @@
           ]
         },
         {
+          "uuid": "3edf5f33-bef1-4e39-ae67-ca5eb79203fa",
           "description": "bird",
           "property": "recite",
           "input": {
@@ -57,6 +60,7 @@
           ]
         },
         {
+          "uuid": "e866a758-e1ff-400e-9f35-f27f28cc288f",
           "description": "cat",
           "property": "recite",
           "input": {
@@ -73,6 +77,7 @@
           ]
         },
         {
+          "uuid": "3f02c30e-496b-4b2a-8491-bc7e2953cafb",
           "description": "dog",
           "property": "recite",
           "input": {
@@ -90,6 +95,7 @@
           ]
         },
         {
+          "uuid": "4b3fd221-01ea-46e0-825b-5734634fbc59",
           "description": "goat",
           "property": "recite",
           "input": {
@@ -108,6 +114,7 @@
           ]
         },
         {
+          "uuid": "1b707da9-7001-4fac-941f-22ad9c7a65d4",
           "description": "cow",
           "property": "recite",
           "input": {
@@ -127,6 +134,7 @@
           ]
         },
         {
+          "uuid": "3cb10d46-ae4e-4d2c-9296-83c9ffc04cdc",
           "description": "horse",
           "property": "recite",
           "input": {
@@ -139,6 +147,7 @@
           ]
         },
         {
+          "uuid": "22b863d5-17e4-4d1e-93e4-617329a5c050",
           "description": "multiple verses",
           "property": "recite",
           "input": {
@@ -162,6 +171,7 @@
           ]
         },
         {
+          "uuid": "e626b32b-745c-4101-bcbd-3b13456893db",
           "description": "full song",
           "property": "recite",
           "input": {
@@ -224,4 +234,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/forth/canonical-data.json b/exercises/forth/canonical-data.json
index 985ec286b6..6aaf004bce 100644
--- a/exercises/forth/canonical-data.json
+++ b/exercises/forth/canonical-data.json
@@ -11,6 +11,7 @@
       "description": "parsing and numbers",
       "cases": [
         {
+          "uuid": "9962203f-f00a-4a85-b404-8a8ecbcec09d",
           "description": "numbers just get pushed onto the stack",
           "property": "evaluate",
           "input": {
@@ -24,6 +25,7 @@
       "description": "addition",
       "cases": [
         {
+          "uuid": "9e69588e-a3d8-41a3-a371-ea02206c1e6e",
           "description": "can add two numbers",
           "property": "evaluate",
           "input": {
@@ -32,6 +34,7 @@
           "expected": [3]
         },
         {
+          "uuid": "52336dd3-30da-4e5c-8523-bdf9a3427657",
           "description": "errors if there is nothing on the stack",
           "property": "evaluate",
           "input": {
@@ -40,6 +43,7 @@
           "expected": {"error": "empty stack"}
         },
         {
+          "uuid": "06efb9a4-817a-435e-b509-06166993c1b8",
           "description": "errors if there is only one value on the stack",
           "property": "evaluate",
           "input": {
@@ -53,6 +57,7 @@
       "description": "subtraction",
       "cases": [
         {
+          "uuid": "09687c99-7bbc-44af-8526-e402f997ccbf",
           "description": "can subtract two numbers",
           "property": "evaluate",
           "input": {
@@ -61,6 +66,7 @@
           "expected": [-1]
         },
         {
+          "uuid": "5d63eee2-1f7d-4538-b475-e27682ab8032",
           "description": "errors if there is nothing on the stack",
           "property": "evaluate",
           "input": {
@@ -69,6 +75,7 @@
           "expected": {"error": "empty stack"}
         },
         {
+          "uuid": "b3cee1b2-9159-418a-b00d-a1bb3765c23b",
           "description": "errors if there is only one value on the stack",
           "property": "evaluate",
           "input": {
@@ -82,6 +89,7 @@
       "description": "multiplication",
       "cases": [
         {
+          "uuid": "5df0ceb5-922e-401f-974d-8287427dbf21",
           "description": "can multiply two numbers",
           "property": "evaluate",
           "input": {
@@ -90,6 +98,7 @@
           "expected": [8]
         },
         {
+          "uuid": "9e004339-15ac-4063-8ec1-5720f4e75046",
           "description": "errors if there is nothing on the stack",
           "property": "evaluate",
           "input": {
@@ -98,6 +107,7 @@
           "expected": {"error": "empty stack"}
         },
         {
+          "uuid": "8ba4b432-9f94-41e0-8fae-3b3712bd51b3",
           "description": "errors if there is only one value on the stack",
           "property": "evaluate",
           "input": {
@@ -111,6 +121,7 @@
       "description": "division",
       "cases": [
         {
+          "uuid": "e74c2204-b057-4cff-9aa9-31c7c97a93f5",
           "description": "can divide two numbers",
           "property": "evaluate",
           "input": {
@@ -119,6 +130,7 @@
           "expected": [4]
         },
         {
+          "uuid": "54f6711c-4b14-4bb0-98ad-d974a22c4620",
           "description": "performs integer division",
           "property": "evaluate",
           "input": {
@@ -127,6 +139,7 @@
           "expected": [2]
         },
         {
+          "uuid": "a5df3219-29b4-4d2f-b427-81f82f42a3f1",
           "description": "errors if dividing by zero",
           "property": "evaluate",
           "input": {
@@ -135,6 +148,7 @@
           "expected": {"error": "divide by zero"}
         },
         {
+          "uuid": "1d5bb6b3-6749-4e02-8a79-b5d4d334cb8a",
           "description": "errors if there is nothing on the stack",
           "property": "evaluate",
           "input": {
@@ -143,6 +157,7 @@
           "expected": {"error": "empty stack"}
         },
         {
+          "uuid": "d5547f43-c2ff-4d5c-9cb0-2a4f6684c20d",
           "description": "errors if there is only one value on the stack",
           "property": "evaluate",
           "input": {
@@ -156,6 +171,7 @@
       "description": "combined arithmetic",
       "cases": [
         {
+          "uuid": "ee28d729-6692-4a30-b9be-0d830c52a68c",
           "description": "addition and subtraction",
           "property": "evaluate",
           "input": {
@@ -164,6 +180,7 @@
           "expected": [-1]
         },
         {
+          "uuid": "40b197da-fa4b-4aca-a50b-f000d19422c1",
           "description": "multiplication and division",
           "property": "evaluate",
           "input": {
@@ -177,6 +194,7 @@
       "description": "dup",
       "cases": [
         {
+          "uuid": "c5758235-6eef-4bf6-ab62-c878e50b9957",
           "description": "copies a value on the stack",
           "property": "evaluate",
           "input": {
@@ -185,6 +203,7 @@
           "expected": [1, 1]
         },
         {
+          "uuid": "f6889006-5a40-41e7-beb3-43b09e5a22f4",
           "description": "copies the top value on the stack",
           "property": "evaluate",
           "input": {
@@ -193,6 +212,7 @@
           "expected": [1, 2, 2]
         },
         {
+          "uuid": "40b7569c-8401-4bd4-a30d-9adf70d11bc4",
           "description": "errors if there is nothing on the stack",
           "property": "evaluate",
           "input": {
@@ -206,6 +226,7 @@
       "description": "drop",
       "cases": [
         {
+          "uuid": "1971da68-1df2-4569-927a-72bf5bb7263c",
           "description": "removes the top value on the stack if it is the only one",
           "property": "evaluate",
           "input": {
@@ -214,6 +235,7 @@
           "expected": []
         },
         {
+          "uuid": "8929d9f2-4a78-4e0f-90ad-be1a0f313fd9",
           "description": "removes the top value on the stack if it is not the only one",
           "property": "evaluate",
           "input": {
@@ -222,6 +244,7 @@
           "expected": [1]
         },
         {
+          "uuid": "6dd31873-6dd7-4cb8-9e90-7daa33ba045c",
           "description": "errors if there is nothing on the stack",
           "property": "evaluate",
           "input": {
@@ -235,6 +258,7 @@
       "description": "swap",
       "cases": [
         {
+          "uuid": "3ee68e62-f98a-4cce-9e6c-8aae6c65a4e3",
           "description": "swaps the top two values on the stack if they are the only ones",
           "property": "evaluate",
           "input": {
@@ -243,6 +267,7 @@
           "expected": [2, 1]
         },
         {
+          "uuid": "8ce869d5-a503-44e4-ab55-1da36816ff1c",
           "description": "swaps the top two values on the stack if they are not the only ones",
           "property": "evaluate",
           "input": {
@@ -251,6 +276,7 @@
           "expected": [1, 3, 2]
         },
         {
+          "uuid": "74ba5b2a-b028-4759-9176-c5c0e7b2b154",
           "description": "errors if there is nothing on the stack",
           "property": "evaluate",
           "input": {
@@ -259,6 +285,7 @@
           "expected": {"error": "empty stack"}
         },
         {
+          "uuid": "dd52e154-5d0d-4a5c-9e5d-73eb36052bc8",
           "description": "errors if there is only one value on the stack",
           "property": "evaluate",
           "input": {
@@ -272,6 +299,7 @@
       "description": "over",
       "cases": [
         {
+          "uuid": "a2654074-ba68-4f93-b014-6b12693a8b50",
           "description": "copies the second element if there are only two",
           "property": "evaluate",
           "input": {
@@ -280,6 +308,7 @@
           "expected": [1, 2, 1]
         },
         {
+          "uuid": "c5b51097-741a-4da7-8736-5c93fa856339",
           "description": "copies the second element if there are more than two",
           "property": "evaluate",
           "input": {
@@ -288,6 +317,7 @@
           "expected": [1, 2, 3, 2]
         },
         {
+          "uuid": "6e1703a6-5963-4a03-abba-02e77e3181fd",
           "description": "errors if there is nothing on the stack",
           "property": "evaluate",
           "input": {
@@ -296,6 +326,7 @@
           "expected": {"error": "empty stack"}
         },
         {
+          "uuid": "ee574dc4-ef71-46f6-8c6a-b4af3a10c45f",
           "description": "errors if there is only one value on the stack",
           "property": "evaluate",
           "input": {
@@ -309,6 +340,7 @@
       "description": "user-defined words",
       "cases": [
         {
+          "uuid": "ed45cbbf-4dbf-4901-825b-54b20dbee53b",
           "description": "can consist of built-in words",
           "property": "evaluate",
           "input": {
@@ -320,6 +352,7 @@
           "expected": [1, 1, 1]
         },
         {
+          "uuid": "2726ea44-73e4-436b-bc2b-5ff0c6aa014b",
           "description": "execute in the right order",
           "property": "evaluate",
           "input": {
@@ -331,6 +364,7 @@
           "expected": [1, 2, 3]
         },
         {
+          "uuid": "9e53c2d0-b8ef-4ad8-b2c9-a559b421eb33",
           "description": "can override other user-defined words",
           "property": "evaluate",
           "input": {
@@ -343,6 +377,7 @@
           "expected": [1, 1, 1]
         },
         {
+          "uuid": "669db3f3-5bd6-4be0-83d1-618cd6e4984b",
           "description": "can override built-in words",
           "property": "evaluate",
           "input": {
@@ -354,6 +389,7 @@
           "expected": [1, 1]
         },
         {
+          "uuid": "588de2f0-c56e-4c68-be0b-0bb1e603c500",
           "description": "can override built-in operators",
           "property": "evaluate",
           "input": {
@@ -365,6 +401,7 @@
           "expected": [12]
         },
         {
+          "uuid": "ac12aaaf-26c6-4a10-8b3c-1c958fa2914c",
           "description": "can use different words with the same name",
           "property": "evaluate",
           "input": {
@@ -378,6 +415,7 @@
           "expected": [5, 6]
         },
         {
+          "uuid": "53f82ef0-2750-4ccb-ac04-5d8c1aefabb1",
           "description": "can define word that uses word with the same name",
           "property": "evaluate",
           "input": {
@@ -390,6 +428,7 @@
           "expected": [11]
         },
         {
+          "uuid": "35958cee-a976-4a0f-9378-f678518fa322",
           "description": "cannot redefine numbers",
           "property": "evaluate",
           "input": {
@@ -398,6 +437,7 @@
           "expected": {"error": "illegal operation"}
         },
         {
+          "uuid": "5180f261-89dd-491e-b230-62737e09806f",
           "description": "errors if executing a non-existent word",
           "property": "evaluate",
           "input": {
@@ -411,6 +451,7 @@
       "description": "case-insensitivity",
       "cases": [
         {
+          "uuid": "7b83bb2e-b0e8-461f-ad3b-96ee2e111ed6",
           "description": "DUP is case-insensitive",
           "property": "evaluate",
           "input": {
@@ -419,6 +460,7 @@
           "expected": [1, 1, 1, 1]
         },
         {
+          "uuid": "339ed30b-f5b4-47ff-ab1c-67591a9cd336",
           "description": "DROP is case-insensitive",
           "property": "evaluate",
           "input": {
@@ -427,6 +469,7 @@
           "expected": [1]
         },
         {
+          "uuid": "ee1af31e-1355-4b1b-bb95-f9d0b2961b87",
           "description": "SWAP is case-insensitive",
           "property": "evaluate",
           "input": {
@@ -435,6 +478,7 @@
           "expected": [2, 3, 4, 1]
         },
         {
+          "uuid": "acdc3a49-14c8-4cc2-945d-11edee6408fa",
           "description": "OVER is case-insensitive",
           "property": "evaluate",
           "input": {
@@ -443,6 +487,7 @@
           "expected": [1, 2, 1, 2, 1]
         },
         {
+          "uuid": "5934454f-a24f-4efc-9fdd-5794e5f0c23c",
           "description": "user-defined words are case-insensitive",
           "property": "evaluate",
           "input": {
@@ -454,6 +499,7 @@
           "expected": [1, 1, 1, 1]
         },
         {
+          "uuid": "037d4299-195f-4be7-a46d-f07ca6280a06",
           "description": "definitions are case-insensitive",
           "property": "evaluate",
           "input": {
diff --git a/exercises/gigasecond/canonical-data.json b/exercises/gigasecond/canonical-data.json
index 86691953c6..04dadef0f2 100644
--- a/exercises/gigasecond/canonical-data.json
+++ b/exercises/gigasecond/canonical-data.json
@@ -20,6 +20,7 @@
       "description": "Add one gigasecond to the input.",
       "cases": [
         {
+          "uuid": "92fbe71c-ea52-4fac-bd77-be38023cacf7",
           "description": "date only specification of time",
           "property": "add",
           "input": {
@@ -28,6 +29,7 @@
           "expected": "2043-01-01T01:46:40"
         },
         {
+          "uuid": "6d86dd16-6f7a-47be-9e58-bb9fb2ae1433",
           "description": "second test for date only specification of time",
           "property": "add",
           "input": {
@@ -36,6 +38,7 @@
           "expected": "2009-02-19T01:46:40"
         },
         {
+          "uuid": "77eb8502-2bca-4d92-89d9-7b39ace28dd5",
           "description": "third test for date only specification of time",
           "property": "add",
           "input": {
@@ -44,6 +47,7 @@
           "expected": "1991-03-27T01:46:40"
         },
         {
+          "uuid": "c9d89a7d-06f8-4e28-a305-64f1b2abc693",
           "description": "full time specified",
           "property": "add",
           "input": {
@@ -52,6 +56,7 @@
           "expected": "2046-10-02T23:46:40"
         },
         {
+          "uuid": "09d4e30e-728a-4b52-9005-be44a58d9eba",
           "description": "full time with day roll-over",
           "property": "add",
           "input": {
@@ -62,4 +67,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/go-counting/canonical-data.json b/exercises/go-counting/canonical-data.json
index a2e0efd7c0..8646f6b9cd 100644
--- a/exercises/go-counting/canonical-data.json
+++ b/exercises/go-counting/canonical-data.json
@@ -6,6 +6,7 @@
   ],
   "cases": [
     {
+      "uuid": "94d0c01a-17d0-424c-aab5-2736d0da3939",
       "description": "Black corner territory on 5x5 board",
       "property": "territory",
       "input": {
@@ -25,6 +26,7 @@
       }
     },
     {
+      "uuid": "b33bec54-356a-485c-9c71-1142a9403213",
       "description": "White center territory on 5x5 board",
       "property": "territory",
       "input": {
@@ -44,6 +46,7 @@
       }
     },
     {
+      "uuid": "def7d124-422e-44ae-90e5-ceda09399bda",
       "description": "Open corner territory on 5x5 board",
       "property": "territory",
       "input": {
@@ -63,6 +66,7 @@
       }
     },
     {
+      "uuid": "57d79036-2618-47f4-aa87-56c06d362e3d",
       "description": "A stone and not a territory on 5x5 board",
       "property": "territory",
       "input": {
@@ -82,6 +86,7 @@
       }
     },
     {
+      "uuid": "0c84f852-e032-4762-9010-99f6a001da96",
       "description": "Invalid because X is too low for 5x5 board",
       "property": "territory",
       "input": {
@@ -100,6 +105,7 @@
       }
     },
     {
+      "uuid": "6f867945-9b2c-4bdd-b23e-b55fe2069a68",
       "description": "Invalid because X is too high for 5x5 board",
       "property": "territory",
       "input": {
@@ -118,6 +124,7 @@
       }
     },
     {
+      "uuid": "d67aaffd-fdf1-4e7f-b9e9-79897402b64a",
       "description": "Invalid because Y is too low for 5x5 board",
       "property": "territory",
       "input": {
@@ -136,6 +143,7 @@
       }
     },
     {
+      "uuid": "14f23c25-799e-4371-b3e5-777a2c30357a",
       "description": "Invalid because Y is too high for 5x5 board",
       "property": "territory",
       "input": {
@@ -154,6 +162,7 @@
       }
     },
     {
+      "uuid": "37fb04b5-98c1-4b96-8c16-af2d13624afd",
       "description": "One territory is the whole board",
       "property": "territories",
       "input": {
@@ -168,6 +177,7 @@
       }
     },
     {
+      "uuid": "9a1c59b7-234b-495a-8d60-638489f0fc0a",
       "description": "Two territory rectangular board",
       "property": "territories",
       "input": {
@@ -183,6 +193,7 @@
       }
     },
     {
+      "uuid": "d1645953-1cd5-4221-af6f-8164f96249e1",
       "description": "Two region rectangular board",
       "property": "territories",
       "input": {
diff --git a/exercises/grade-school/canonical-data.json b/exercises/grade-school/canonical-data.json
index 2736ba6631..38b7711714 100644
--- a/exercises/grade-school/canonical-data.json
+++ b/exercises/grade-school/canonical-data.json
@@ -7,6 +7,7 @@
     ],
     "cases": [
         {
+            "uuid": "6d0a30e4-1b4e-472e-8e20-c41702125667",
             "description": "Adding a student adds them to the sorted roster",
             "property": "roster",
             "input": {
@@ -15,6 +16,7 @@
             "expected": ["Aimee"]
         },
         {
+            "uuid": "233be705-dd58-4968-889d-fb3c7954c9cc",
             "description": "Adding more student adds them to the sorted roster",
             "property": "roster",
             "input": {
@@ -23,6 +25,7 @@
             "expected": ["Blair", "James", "Paul"]
         },
         {
+            "uuid": "75a51579-d1d7-407c-a2f8-2166e984e8ab",
             "description": "Adding students to different grades adds them to the same sorted roster",
             "property": "roster",
             "input": {
@@ -31,6 +34,7 @@
             "expected": ["Chelsea", "Logan"]
         },
         {
+            "uuid": "a3f0fb58-f240-4723-8ddc-e644666b85cc",
             "description": "Roster returns an empty list if there are no students enrolled",
             "property": "roster",
             "input": {
@@ -39,6 +43,7 @@
             "expected": []
         },
         {
+            "uuid": "180a8ff9-5b94-43fc-9db1-d46b4a8c93b6",
             "description": "Student names with grades are displayed in the same sorted roster",
             "property": "roster",
             "input": {
@@ -47,6 +52,7 @@
             "expected": ["Anna", "Barb", "Charlie", "Alex", "Peter", "Zoe", "Jim"]
         },
         {
+            "uuid": "1bfbcef1-e4a3-49e8-8d22-f6f9f386187e",
             "description": "Grade returns the students in that grade in alphabetical order",
             "property": "grade",
             "input": {
@@ -56,6 +62,7 @@
             "expected": ["Bradley", "Franklin"]
         },
         {
+            "uuid": "5e67aa3c-a3c6-4407-a183-d8fe59cd1630",
             "description": "Grade returns an empty list if there are no students in that grade",
             "property": "grade",
             "input": {
diff --git a/exercises/grains/canonical-data.json b/exercises/grains/canonical-data.json
index d78a303e50..c0fcea440e 100644
--- a/exercises/grains/canonical-data.json
+++ b/exercises/grains/canonical-data.json
@@ -10,6 +10,7 @@
       "description": "returns the number of grains on the square",
       "cases": [
         {
+          "uuid": "9fbde8de-36b2-49de-baf2-cd42d6f28405",
           "description": "1",
           "property": "square",
           "input": {
@@ -18,6 +19,7 @@
           "expected": 1
         },
         {
+          "uuid": "ee1f30c2-01d8-4298-b25d-c677331b5e6d",
           "description": "2",
           "property": "square",
           "input": {
@@ -26,6 +28,7 @@
           "expected": 2
         },
         {
+          "uuid": "10f45584-2fc3-4875-8ec6-666065d1163b",
           "description": "3",
           "property": "square",
           "input": {
@@ -34,6 +37,7 @@
           "expected": 4
         },
         {
+          "uuid": "a7cbe01b-36f4-4601-b053-c5f6ae055170",
           "description": "4",
           "property": "square",
           "input": {
@@ -42,6 +46,7 @@
           "expected": 8
         },
         {
+          "uuid": "c50acc89-8535-44e4-918f-b848ad2817d4",
           "description": "16",
           "property": "square",
           "input": {
@@ -50,6 +55,7 @@
           "expected": 32768
         },
         {
+          "uuid": "acd81b46-c2ad-4951-b848-80d15ed5a04f",
           "description": "32",
           "property": "square",
           "input": {
@@ -58,6 +64,7 @@
           "expected": 2147483648
         },
         {
+          "uuid": "c73b470a-5efb-4d53-9ac6-c5f6487f227b",
           "description": "64",
           "property": "square",
           "input": {
@@ -66,6 +73,7 @@
           "expected": 9223372036854775808
         },
         {
+          "uuid": "1d47d832-3e85-4974-9466-5bd35af484e3",
           "description": "square 0 raises an exception",
           "property": "square",
           "input": {
@@ -74,6 +82,7 @@
           "expected": {"error": "square must be between 1 and 64"}
         },
         {
+          "uuid": "61974483-eeb2-465e-be54-ca5dde366453",
           "description": "negative square raises an exception",
           "property": "square",
           "input": {
@@ -82,6 +91,7 @@
           "expected": {"error": "square must be between 1 and 64"}
         },
         {
+          "uuid": "a95e4374-f32c-45a7-a10d-ffec475c012f",
           "description": "square greater than 64 raises an exception",
           "property": "square",
           "input": {
@@ -92,6 +102,7 @@
       ]
     },
     {
+      "uuid": "6eb07385-3659-4b45-a6be-9dc474222750",
       "description": "returns the total number of grains on the board",
       "property": "total",
       "input": {},
diff --git a/exercises/grep/canonical-data.json b/exercises/grep/canonical-data.json
index 3baaff19fd..f905f916aa 100644
--- a/exercises/grep/canonical-data.json
+++ b/exercises/grep/canonical-data.json
@@ -57,6 +57,7 @@
       "description": "Test grepping a single file",
       "cases": [
         {
+          "uuid": "9049fdfd-53a7-4480-a390-375203837d09",
           "description": "One file, one match, no flags",
           "property": "grep",
           "input": {
@@ -69,6 +70,7 @@
           ]
         },
         {
+          "uuid": "76519cce-98e3-46cd-b287-aac31b1d77d6",
           "description": "One file, one match, print line numbers flag",
           "property": "grep",
           "input": {
@@ -81,6 +83,7 @@
           ]
         },
         {
+          "uuid": "af0b6d3c-e0e8-475e-a112-c0fc10a1eb30",
           "description": "One file, one match, case-insensitive flag",
           "property": "grep",
           "input": {
@@ -93,6 +96,7 @@
           ]
         },
         {
+          "uuid": "ff7af839-d1b8-4856-a53e-99283579b672",
           "description": "One file, one match, print file names flag",
           "property": "grep",
           "input": {
@@ -105,6 +109,7 @@
           ]
         },
         {
+          "uuid": "8625238a-720c-4a16-81f2-924ec8e222cb",
           "description": "One file, one match, match entire lines flag",
           "property": "grep",
           "input": {
@@ -117,6 +122,7 @@
           ]
         },
         {
+          "uuid": "2a6266b3-a60f-475c-a5f5-f5008a717d3e",
           "description": "One file, one match, multiple flags",
           "property": "grep",
           "input": {
@@ -129,6 +135,7 @@
           ]
         },
         {
+          "uuid": "842222da-32e8-4646-89df-0d38220f77a1",
           "description": "One file, several matches, no flags",
           "property": "grep",
           "input": {
@@ -143,6 +150,7 @@
           ]
         },
         {
+          "uuid": "4d84f45f-a1d8-4c2e-a00e-0b292233828c",
           "description": "One file, several matches, print line numbers flag",
           "property": "grep",
           "input": {
@@ -157,6 +165,7 @@
           ]
         },
         {
+          "uuid": "0a483b66-315b-45f5-bc85-3ce353a22539",
           "description": "One file, several matches, match entire lines flag",
           "property": "grep",
           "input": {
@@ -167,6 +176,7 @@
           "expected": []
         },
         {
+          "uuid": "3d2ca86a-edd7-494c-8938-8eeed1c61cfa",
           "description": "One file, several matches, case-insensitive flag",
           "property": "grep",
           "input": {
@@ -180,6 +190,7 @@
           ]
         },
         {
+          "uuid": "1f52001f-f224-4521-9456-11120cad4432",
           "description": "One file, several matches, inverted flag",
           "property": "grep",
           "input": {
@@ -196,6 +207,7 @@
           ]
         },
         {
+          "uuid": "7a6ede7f-7dd5-4364-8bf8-0697c53a09fe",
           "description": "One file, no matches, various flags",
           "property": "grep",
           "input": {
@@ -206,6 +218,7 @@
           "expected": []
         },
         {
+          "uuid": "3d3dfc23-8f2a-4e34-abd6-7b7d140291dc",
           "description": "One file, one match, file flag takes precedence over line flag",
           "property": "grep",
           "input": {
@@ -218,6 +231,7 @@
           ]
         },
         {
+          "uuid": "87b21b24-b788-4d6e-a68b-7afe9ca141fe",
           "description": "One file, several matches, inverted and match entire lines flags",
           "property": "grep",
           "input": {
@@ -242,6 +256,7 @@
       "description": "Test grepping multiples files at once",
       "cases": [
         {
+          "uuid": "ba496a23-6149-41c6-a027-28064ed533e5",
           "description": "Multiple files, one match, no flags",
           "property": "grep",
           "input": {
@@ -254,6 +269,7 @@
           ]
         },
         {
+          "uuid": "4539bd36-6daa-4bc3-8e45-051f69f5aa95",
           "description": "Multiple files, several matches, no flags",
           "property": "grep",
           "input": {
@@ -268,6 +284,7 @@
           ]
         },
         {
+          "uuid": "9fb4cc67-78e2-4761-8e6b-a4b57aba1938",
           "description": "Multiple files, several matches, print line numbers flag",
           "property": "grep",
           "input": {
@@ -283,6 +300,7 @@
           ]
         },
         {
+          "uuid": "aeee1ef3-93c7-4cd5-af10-876f8c9ccc73",
           "description": "Multiple files, one match, print file names flag",
           "property": "grep",
           "input": {
@@ -296,6 +314,7 @@
           ]
         },
         {
+          "uuid": "d69f3606-7d15-4ddf-89ae-01df198e6b6c",
           "description": "Multiple files, several matches, case-insensitive flag",
           "property": "grep",
           "input": {
@@ -317,6 +336,7 @@
           ]
         },
         {
+          "uuid": "82ef739d-6701-4086-b911-007d1a3deb21",
           "description": "Multiple files, several matches, inverted flag",
           "property": "grep",
           "input": {
@@ -331,6 +351,7 @@
           ]
         },
         {
+          "uuid": "77b2eb07-2921-4ea0-8971-7636b44f5d29",
           "description": "Multiple files, one match, match entire lines flag",
           "property": "grep",
           "input": {
@@ -343,6 +364,7 @@
           ]
         },
         {
+          "uuid": "e53a2842-55bb-4078-9bb5-04ac38929989",
           "description": "Multiple files, one match, multiple flags",
           "property": "grep",
           "input": {
@@ -355,6 +377,7 @@
           ]
         },
         {
+          "uuid": "9c4f7f9a-a555-4e32-bb06-4b8f8869b2cb",
           "description": "Multiple files, no matches, various flags",
           "property": "grep",
           "input": {
@@ -365,6 +388,7 @@
           "expected": []
         },
         {
+          "uuid": "ba5a540d-bffd-481b-bd0c-d9a30f225e01",
           "description": "Multiple files, several matches, file flag takes precedence over line number flag",
           "property": "grep",
           "input": {
@@ -378,6 +402,7 @@
           ]
         },
         {
+          "uuid": "ff406330-2f0b-4b17-9ee4-4b71c31dd6d2",
           "description": "Multiple files, several matches, inverted and match entire lines flags",
           "property": "grep",
           "input": {
diff --git a/exercises/hamming/canonical-data.json b/exercises/hamming/canonical-data.json
index 3e78807457..8e3828d2d9 100644
--- a/exercises/hamming/canonical-data.json
+++ b/exercises/hamming/canonical-data.json
@@ -12,6 +12,7 @@
   ],
   "cases": [
     {
+      "uuid": "f6dcb64f-03b0-4b60-81b1-3c9dbf47e887",
       "description": "empty strands",
       "property": "distance",
       "input": {
@@ -21,6 +22,7 @@
       "expected": 0
     },
     {
+      "uuid": "54681314-eee2-439a-9db0-b0636c656156",
       "description": "single letter identical strands",
       "property": "distance",
       "input": {
@@ -30,6 +32,7 @@
       "expected": 0
     },
     {
+      "uuid": "294479a3-a4c8-478f-8d63-6209815a827b",
       "description": "single letter different strands",
       "property": "distance",
       "input": {
@@ -39,6 +42,7 @@
       "expected": 1
     },
     {
+      "uuid": "9aed5f34-5693-4344-9b31-40c692fb5592",
       "description": "long identical strands",
       "property": "distance",
       "input": {
@@ -48,6 +52,7 @@
       "expected": 0
     },
     {
+      "uuid": "cd2273a5-c576-46c8-a52b-dee251c3e6e5",
       "description": "long different strands",
       "property": "distance",
       "input": {
@@ -57,6 +62,7 @@
       "expected": 9
     },
     {
+      "uuid": "919f8ef0-b767-4d1b-8516-6379d07fcb28",
       "description": "disallow first strand longer",
       "property": "distance",
       "input": {
@@ -66,6 +72,7 @@
       "expected": {"error": "left and right strands must be of equal length"}
     },
     {
+      "uuid": "8a2d4ed0-ead5-4fdd-924d-27c4cf56e60e",
       "description": "disallow second strand longer",
       "property": "distance",
       "input": {
@@ -75,6 +82,7 @@
       "expected": {"error": "left and right strands must be of equal length"}
     },
     {
+      "uuid": "5dce058b-28d4-4ca7-aa64-adfe4e17784c",
       "description": "disallow left empty strand",
       "property": "distance",
       "input": {
@@ -84,6 +92,7 @@
       "expected": {"error": "left strand must not be empty"}
     },
     {
+      "uuid": "38826d4b-16fb-4639-ac3e-ba027dec8b5f",
       "description": "disallow right empty strand",
       "property": "distance",
       "input": {
diff --git a/exercises/hello-world/canonical-data.json b/exercises/hello-world/canonical-data.json
index 7e639b49d3..3b60e3f396 100644
--- a/exercises/hello-world/canonical-data.json
+++ b/exercises/hello-world/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "af9ffe10-dc13-42d8-a742-e7bdafac449d",
       "description": "Say Hi!",
       "property": "hello",
       "input": {},
diff --git a/exercises/high-scores/canonical-data.json b/exercises/high-scores/canonical-data.json
index b90579582b..0f57e6fcf9 100644
--- a/exercises/high-scores/canonical-data.json
+++ b/exercises/high-scores/canonical-data.json
@@ -11,6 +11,7 @@
   ],
   "cases": [
     {
+      "uuid": "1035eb93-2208-4c22-bab8-fef06769a73c",
       "description": "List of scores",
       "property": "scores",
       "input": {
@@ -19,6 +20,7 @@
       "expected": [30, 50, 20, 70]
     },
     {
+      "uuid": "6aa5dbf5-78fa-4375-b22c-ffaa989732d2",
       "description": "Latest score",
       "property": "latest",
       "input": {
@@ -27,6 +29,7 @@
       "expected": 30
     },
     {
+      "uuid": "b661a2e1-aebf-4f50-9139-0fb817dd12c6",
       "description": "Personal best",
       "property": "personalBest",
       "input": {
@@ -38,6 +41,7 @@
       "description": "Top 3 scores",
       "cases": [
         {
+          "uuid": "3d996a97-c81c-4642-9afc-80b80dc14015",
           "description": "Personal top three from a list of scores",
           "property": "personalTopThree",
           "input": {
@@ -46,6 +50,7 @@
           "expected": [100, 90, 70]
         },
         {
+          "uuid": "1084ecb5-3eb4-46fe-a816-e40331a4e83a",
           "description": "Personal top highest to lowest",
           "property": "personalTopThree",
           "input": {
@@ -54,6 +59,7 @@
           "expected": [30, 20, 10]
         },
         {
+          "uuid": "e6465b6b-5a11-4936-bfe3-35241c4f4f16",
           "description": "Personal top when there is a tie",
           "property": "personalTopThree",
           "input": {
@@ -62,6 +68,7 @@
           "expected": [40, 40, 30]
         },
         {
+          "uuid": "f73b02af-c8fd-41c9-91b9-c86eaa86bce2",
           "description": "Personal top when there are less than 3",
           "property": "personalTopThree",
           "input": {
@@ -70,6 +77,7 @@
           "expected": [70, 30]
         },
         {
+          "uuid": "16608eae-f60f-4a88-800e-aabce5df2865",
           "description": "Personal top when there is only one",
           "property": "personalTopThree",
           "input": {
diff --git a/exercises/house/canonical-data.json b/exercises/house/canonical-data.json
index dc54ca23f4..51793fddc5 100644
--- a/exercises/house/canonical-data.json
+++ b/exercises/house/canonical-data.json
@@ -16,6 +16,7 @@
       "description": "Return specified verse or series of verses",
       "cases": [
         {
+          "uuid": "28a540ff-f765-4348-9d57-ae33f25f41f2",
           "description": "verse one - the house that jack built",
           "property": "recite",
           "input": {
@@ -27,6 +28,7 @@
           ]
         },
         {
+          "uuid": "ebc825ac-6e2b-4a5e-9afd-95732191c8da",
           "description": "verse two - the malt that lay",
           "property": "recite",
           "input": {
@@ -38,6 +40,7 @@
           ]
         },
         {
+          "uuid": "1ed8bb0f-edb8-4bd1-b6d4-b64754fe4a60",
           "description": "verse three - the rat that ate",
           "property": "recite",
           "input": {
@@ -49,6 +52,7 @@
           ]
         },
         {
+          "uuid": "64b0954e-8b7d-4d14-aad0-d3f6ce297a30",
           "description": "verse four - the cat that killed",
           "property": "recite",
           "input": {
@@ -60,6 +64,7 @@
           ]
         },
         {
+          "uuid": "1e8d56bc-fe31-424d-9084-61e6111d2c82",
           "description": "verse five - the dog that worried",
           "property": "recite",
           "input": {
@@ -71,6 +76,7 @@
           ]
         },
         {
+          "uuid": "6312dc6f-ab0a-40c9-8a55-8d4e582beac4",
           "description": "verse six - the cow with the crumpled horn",
           "property": "recite",
           "input": {
@@ -82,6 +88,7 @@
           ]
         },
         {
+          "uuid": "68f76d18-6e19-4692-819c-5ff6a7f92feb",
           "description": "verse seven - the maiden all forlorn",
           "property": "recite",
           "input": {
@@ -93,6 +100,7 @@
           ]
         },
         {
+          "uuid": "73872564-2004-4071-b51d-2e4326096747",
           "description": "verse eight - the man all tattered and torn",
           "property": "recite",
           "input": {
@@ -104,6 +112,7 @@
           ]
         },
         {
+          "uuid": "0d53d743-66cb-4351-a173-82702f3338c9",
           "description": "verse nine - the priest all shaven and shorn",
           "property": "recite",
           "input": {
@@ -115,6 +124,7 @@
           ]
         },
         {
+          "uuid": "452f24dc-8fd7-4a82-be1a-3b4839cfeb41",
           "description": "verse 10 - the rooster that crowed in the morn",
           "property": "recite",
           "input": {
@@ -126,6 +136,7 @@
           ]
         },
         {
+          "uuid": "97176f20-2dd3-4646-ac72-cffced91ea26",
           "description": "verse 11 - the farmer sowing his corn",
           "property": "recite",
           "input": {
@@ -137,6 +148,7 @@
           ]
         },
         {
+          "uuid": "09824c29-6aad-4dcd-ac98-f61374a6a8b7",
           "description": "verse 12 - the horse and the hound and the horn",
           "property": "recite",
           "input": {
@@ -148,6 +160,7 @@
           ]
         },
         {
+          "uuid": "d2b980d3-7851-49e1-97ab-1524515ec200",
           "description": "multiple verses",
           "property": "recite",
           "input": {
@@ -163,6 +176,7 @@
           ]
         },
         {
+          "uuid": "0311d1d0-e085-4f23-8ae7-92406fb3e803",
           "description": "full rhyme",
           "property": "recite",
           "input": {
diff --git a/exercises/isbn-verifier/canonical-data.json b/exercises/isbn-verifier/canonical-data.json
index 1c35e51142..79129e818a 100644
--- a/exercises/isbn-verifier/canonical-data.json
+++ b/exercises/isbn-verifier/canonical-data.json
@@ -7,6 +7,7 @@
     ],
     "cases": [
         {
+            "uuid": "0caa3eac-d2e3-4c29-8df8-b188bc8c9292",
             "description": "valid isbn number",
             "property": "isValid",
             "input": {
@@ -15,6 +16,7 @@
             "expected": true
         },
         {
+            "uuid": "19f76b53-7c24-45f8-87b8-4604d0ccd248",
             "description": "invalid isbn check digit",
             "property": "isValid",
             "input": {
@@ -23,6 +25,7 @@
             "expected": false
         },
         {
+            "uuid": "4164bfee-fb0a-4a1c-9f70-64c6a1903dcd",
             "description": "valid isbn number with a check digit of 10",
             "property": "isValid",
             "input": {
@@ -31,6 +34,7 @@
             "expected": true
         },
         {
+            "uuid": "3ed50db1-8982-4423-a993-93174a20825c",
             "description": "check digit is a character other than X",
             "property": "isValid",
             "input": {
@@ -39,6 +43,7 @@
             "expected": false
         },
         {
+            "uuid": "c19ba0c4-014f-4dc3-a63f-ff9aefc9b5ec",
             "description": "invalid character in isbn",
             "property": "isValid",
             "input": {
@@ -47,6 +52,7 @@
             "expected": false
         },
         {
+            "uuid": "28025280-2c39-4092-9719-f3234b89c627",
             "description": "X is only valid as a check digit",
             "property": "isValid",
             "input": {
@@ -55,6 +61,7 @@
             "expected": false
         },
         {
+            "uuid": "f6294e61-7e79-46b3-977b-f48789a4945b",
             "description": "valid isbn without separating dashes",
             "property": "isValid",
             "input": {
@@ -63,6 +70,7 @@
             "expected": true
         },
         {
+            "uuid": "185ab99b-3a1b-45f3-aeec-b80d80b07f0b",
             "description": "isbn without separating dashes and X as check digit",
             "property": "isValid",
             "input": {
@@ -71,6 +79,7 @@
             "expected": true
         },
         {
+            "uuid": "7725a837-ec8e-4528-a92a-d981dd8cf3e2",
             "description": "isbn without check digit and dashes",
             "property": "isValid",
             "input": {
@@ -79,6 +88,7 @@
             "expected": false
         },
         {
+            "uuid": "47e4dfba-9c20-46ed-9958-4d3190630bdf",
             "description": "too long isbn and no dashes",
             "property": "isValid",
             "input": {
@@ -87,6 +97,7 @@
             "expected": false
         },
         {
+            "uuid": "737f4e91-cbba-4175-95bf-ae630b41fb60",
             "description": "too short isbn",
             "property": "isValid",
             "input": {
@@ -95,6 +106,7 @@
             "expected": false
         },
         {
+            "uuid": "5458a128-a9b6-4ff8-8afb-674e74567cef",
             "description": "isbn without check digit",
             "property": "isValid",
             "input": {
@@ -103,6 +115,7 @@
             "expected": false
         },
         {
+            "uuid": "70b6ad83-d0a2-4ca7-a4d5-a9ab731800f7",
             "description": "check digit of X should not be used for 0",
             "property": "isValid",
             "input": {
@@ -111,6 +124,7 @@
             "expected": false
         },
         {
+            "uuid": "94610459-55ab-4c35-9b93-ff6ea1a8e562",
             "description": "empty isbn",
             "property": "isValid",
             "input": {
@@ -119,6 +133,7 @@
             "expected": false
         },
         {
+            "uuid": "7bff28d4-d770-48cc-80d6-b20b3a0fb46c",
             "description": "input is 9 characters",
             "property": "isValid",
             "input": {
@@ -127,6 +142,7 @@
             "expected": false
         },
         {
+            "uuid": "ed6e8d1b-382c-4081-8326-8b772c581fec",
             "description": "invalid characters are not ignored",
             "property": "isValid",
             "input": {
@@ -135,6 +151,7 @@
             "expected": false
         },
         {
+            "uuid": "fb5e48d8-7c03-4bfb-a088-b101df16fdc3",
             "description": "input is too long but contains a valid isbn",
             "property": "isValid",
             "input": {
diff --git a/exercises/isogram/canonical-data.json b/exercises/isogram/canonical-data.json
index 843cb16604..7a4d0b9a29 100644
--- a/exercises/isogram/canonical-data.json
+++ b/exercises/isogram/canonical-data.json
@@ -12,6 +12,7 @@
       ],
       "cases": [
         {
+          "uuid": "a0e97d2d-669e-47c7-8134-518a1e2c4555",
           "description": "empty string",
           "property": "isIsogram",
           "input": {
@@ -20,6 +21,7 @@
           "expected": true
         },
         {
+          "uuid": "9a001b50-f194-4143-bc29-2af5ec1ef652",
           "description": "isogram with only lower case characters",
           "property": "isIsogram",
           "input": {
@@ -28,6 +30,7 @@
           "expected": true
         },
         {
+          "uuid": "8ddb0ca3-276e-4f8b-89da-d95d5bae78a4",
           "description": "word with one duplicated character",
           "property": "isIsogram",
           "input": {
@@ -36,6 +39,7 @@
           "expected": false
         },
         {
+          "uuid": "6450b333-cbc2-4b24-a723-0b459b34fe18",
           "description": "word with one duplicated character from the end of the alphabet",
           "property": "isIsogram",
           "input": {
@@ -44,6 +48,7 @@
           "expected": false
         },
         {
+          "uuid": "a15ff557-dd04-4764-99e7-02cc1a385863",
           "description": "longest reported english isogram",
           "property": "isIsogram",
           "input": {
@@ -52,6 +57,7 @@
           "expected": true
         },
         {
+          "uuid": "f1a7f6c7-a42f-4915-91d7-35b2ea11c92e",
           "description": "word with duplicated character in mixed case",
           "property": "isIsogram",
           "input": {
@@ -60,6 +66,7 @@
           "expected": false
         },
         {
+          "uuid": "14a4f3c1-3b47-4695-b645-53d328298942",
           "description": "word with duplicated character in mixed case, lowercase first",
           "property": "isIsogram",
           "input": {
@@ -68,6 +75,7 @@
           "expected": false
         },
         {
+          "uuid": "423b850c-7090-4a8a-b057-97f1cadd7c42",
           "description": "hypothetical isogrammic word with hyphen",
           "property": "isIsogram",
           "input": {
@@ -76,6 +84,7 @@
           "expected": true
         },
         {
+          "uuid": "93dbeaa0-3c5a-45c2-8b25-428b8eacd4f2",
           "description": "hypothetical word with duplicated character following hyphen",
           "property": "isIsogram",
           "input": {
@@ -84,6 +93,7 @@
           "expected": false
         },
         {
+          "uuid": "36b30e5c-173f-49c6-a515-93a3e825553f",
           "description": "isogram with duplicated hyphen",
           "property": "isIsogram",
           "input": {
@@ -92,6 +102,7 @@
           "expected": true
         },
         {
+          "uuid": "cdabafa0-c9f4-4c1f-b142-689c6ee17d93",
           "description": "made-up name that is an isogram",
           "property": "isIsogram",
           "input": {
@@ -100,6 +111,7 @@
           "expected": true
         },
         {
+          "uuid": "5fc61048-d74e-48fd-bc34-abfc21552d4d",
           "description": "duplicated character in the middle",
           "property": "isIsogram",
           "input": {
@@ -108,6 +120,7 @@
           "expected": false
         },
         {
+          "uuid": "310ac53d-8932-47bc-bbb4-b2b94f25a83e",
           "description": "same first and last characters",
           "property": "isIsogram",
           "input": {
diff --git a/exercises/kindergarten-garden/canonical-data.json b/exercises/kindergarten-garden/canonical-data.json
index 53cf06b464..9b4e6ccb10 100644
--- a/exercises/kindergarten-garden/canonical-data.json
+++ b/exercises/kindergarten-garden/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "partial garden",
       "cases": [
         {
+          "uuid": "1fc316ed-17ab-4fba-88ef-3ae78296b692",
           "description": "garden with single student",
           "property": "plants",
           "input": {
@@ -15,6 +16,7 @@
           "expected": ["radishes", "clover", "grass", "grass"]
         },
         {
+          "uuid": "acd19dc1-2200-4317-bc2a-08f021276b40",
           "description": "different garden with single student",
           "property": "plants",
           "input": {
@@ -24,6 +26,7 @@
           "expected": ["violets", "clover", "radishes", "clover"]
         },
         {
+          "uuid": "c376fcc8-349c-446c-94b0-903947315757",
           "description": "garden with two students",
           "property": "plants",
           "input": {
@@ -36,6 +39,7 @@
           "description": "multiple students for the same garden with three students",
           "cases": [
             {
+              "uuid": "2d620f45-9617-4924-9d27-751c80d17db9",
               "description": "second student's garden",
               "property": "plants",
               "input": {
@@ -45,6 +49,7 @@
               "expected": ["clover", "clover", "clover", "clover"]
             },
             {
+              "uuid": "57712331-4896-4364-89f8-576421d69c44",
               "description": "third student's garden",
               "property": "plants",
               "input": {
@@ -61,6 +66,7 @@
       "description": "full garden",
       "cases": [
         {
+          "uuid": "149b4290-58e1-40f2-8ae4-8b87c46e765b",
           "description": "first student's garden",
           "property": "plants",
           "input": {
@@ -70,6 +76,7 @@
           "expected": ["violets", "radishes", "violets", "radishes"]
         },
         {
+          "uuid": "ba25dbbc-10bd-4a37-b18e-f89ecd098a5e",
           "description": "second student's garden",
           "property": "plants",
           "input": {
@@ -79,6 +86,7 @@
           "expected": ["clover", "grass", "clover", "clover"]
         },
         {
+          "uuid": "6bb66df7-f433-41ab-aec2-3ead6e99f65b",
           "description": "second to last student's garden",
           "property": "plants",
           "input": {
@@ -88,6 +96,7 @@
           "expected": ["grass", "clover", "clover", "grass"]
         },
         {
+          "uuid": "d7edec11-6488-418a-94e6-ed509e0fa7eb",
           "description": "last student's garden",
           "property": "plants",
           "input": {
diff --git a/exercises/knapsack/canonical-data.json b/exercises/knapsack/canonical-data.json
index e2263d3a49..4bc019f4ce 100644
--- a/exercises/knapsack/canonical-data.json
+++ b/exercises/knapsack/canonical-data.json
@@ -6,6 +6,7 @@
   ],
   "cases": [
     {
+      "uuid": "a4d7d2f0-ad8a-460c-86f3-88ba709d41a7",
       "description": "no items",
       "property": "maximumValue",
       "input": {
@@ -15,6 +16,7 @@
       "expected": 0
     },
     {
+      "uuid": "1d39e98c-6249-4a8b-912f-87cb12e506b0",
       "description": "one item, too heavy",
       "property": "maximumValue",
       "input": {
@@ -26,6 +28,7 @@
       "expected": 0
     },
     {
+      "uuid": "833ea310-6323-44f2-9d27-a278740ffbd8",
       "description": "five items (cannot be greedy by weight)",
       "property": "maximumValue",
       "input": {
@@ -41,6 +44,7 @@
       "expected": 21
     },
     {
+      "uuid": "277cdc52-f835-4c7d-872b-bff17bab2456",
       "description": "five items (cannot be greedy by value)",
       "property": "maximumValue",
       "input": {
@@ -56,6 +60,7 @@
       "expected": 80
     },
     {
+      "uuid": "81d8e679-442b-4f7a-8a59-7278083916c9",
       "description": "example knapsack",
       "property": "maximumValue",
       "input": {
@@ -70,6 +75,7 @@
       "expected": 90
     },
     {
+      "uuid": "f23a2449-d67c-4c26-bf3e-cde020f27ecc",
       "description": "8 items",
       "property": "maximumValue",
       "input": {
@@ -88,6 +94,7 @@
       "expected": 900
     },
     {
+      "uuid": "7c682ae9-c385-4241-a197-d2fa02c81a11",
       "description": "15 items",
       "property": "maximumValue",
       "input": {
diff --git a/exercises/largest-series-product/canonical-data.json b/exercises/largest-series-product/canonical-data.json
index 27623d5bd0..61e67807ec 100644
--- a/exercises/largest-series-product/canonical-data.json
+++ b/exercises/largest-series-product/canonical-data.json
@@ -14,6 +14,7 @@
   ],
   "cases": [
     {
+      "uuid": "7c82f8b7-e347-48ee-8a22-f672323324d4",
       "description": "finds the largest product if span equals length",
       "property": "largestProduct",
       "input": {
@@ -23,6 +24,7 @@
       "expected": 18
     },
     {
+      "uuid": "88523f65-21ba-4458-a76a-b4aaf6e4cb5e",
       "description": "can find the largest product of 2 with numbers in order",
       "property": "largestProduct",
       "input": {
@@ -32,6 +34,7 @@
       "expected": 72
     },
     {
+      "uuid": "f1376b48-1157-419d-92c2-1d7e36a70b8a",
       "description": "can find the largest product of 2",
       "property": "largestProduct",
       "input": {
@@ -41,6 +44,7 @@
       "expected": 48
     },
     {
+      "uuid": "46356a67-7e02-489e-8fea-321c2fa7b4a4",
       "description": "can find the largest product of 3 with numbers in order",
       "property": "largestProduct",
       "input": {
@@ -50,6 +54,7 @@
       "expected": 504
     },
     {
+      "uuid": "a2dcb54b-2b8f-4993-92dd-5ce56dece64a",
       "description": "can find the largest product of 3",
       "property": "largestProduct",
       "input": {
@@ -59,6 +64,7 @@
       "expected": 270
     },
     {
+      "uuid": "673210a3-33cd-4708-940b-c482d7a88f9d",
       "description": "can find the largest product of 5 with numbers in order",
       "property": "largestProduct",
       "input": {
@@ -68,6 +74,7 @@
       "expected": 15120
     },
     {
+      "uuid": "02acd5a6-3bbf-46df-8282-8b313a80a7c9",
       "description": "can get the largest product of a big number",
       "property": "largestProduct",
       "input": {
@@ -77,6 +84,7 @@
       "expected": 23520
     },
     {
+      "uuid": "76dcc407-21e9-424c-a98e-609f269622b5",
       "description": "reports zero if the only digits are zero",
       "property": "largestProduct",
       "input": {
@@ -86,6 +94,7 @@
       "expected": 0
     },
     {
+      "uuid": "6ef0df9f-52d4-4a5d-b210-f6fae5f20e19",
       "description": "reports zero if all spans include zero",
       "property": "largestProduct",
       "input": {
@@ -95,6 +104,7 @@
       "expected": 0
     },
     {
+      "uuid": "5d81aaf7-4f67-4125-bf33-11493cc7eab7",
       "description": "rejects span longer than string length",
       "property": "largestProduct",
       "input": {
@@ -118,6 +128,7 @@
         "So LSP('123', 4) really DOES take the max of an empty list.",
         "So LSP('123', 4) errors and LSP('', 0) does NOT."
       ],
+      "uuid": "06bc8b90-0c51-4c54-ac22-3ec3893a079e",
       "description": "reports 1 for empty string and empty product (0 span)",
       "property": "largestProduct",
       "input": {
@@ -131,6 +142,7 @@
         "As above, there is one 0-character string in '123'.",
         "So again no error. It's the empty product, 1."
       ],
+      "uuid": "3ec0d92e-f2e2-4090-a380-70afee02f4c0",
       "description": "reports 1 for nonempty string and empty product (0 span)",
       "property": "largestProduct",
       "input": {
@@ -140,6 +152,7 @@
       "expected": 1
     },
     {
+      "uuid": "6d96c691-4374-4404-80ee-2ea8f3613dd4",
       "description": "rejects empty string and nonzero span",
       "property": "largestProduct",
       "input": {
@@ -149,6 +162,7 @@
       "expected": {"error": "span must be smaller than string length"}
     },
     {
+      "uuid": "7a38f2d6-3c35-45f6-8d6f-12e6e32d4d74",
       "description": "rejects invalid character in digits",
       "property": "largestProduct",
       "input": {
@@ -158,6 +172,7 @@
       "expected": {"error": "digits input must only contain digits"}
     },
     {
+      "uuid": "5fe3c0e5-a945-49f2-b584-f0814b4dd1ef",
       "description": "rejects negative span",
       "property": "largestProduct",
       "input": {
@@ -167,4 +182,4 @@
       "expected": {"error": "span must be greater than zero"}
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/leap/canonical-data.json b/exercises/leap/canonical-data.json
index aed412c1e8..7c3b02151f 100644
--- a/exercises/leap/canonical-data.json
+++ b/exercises/leap/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.6.0",
   "cases": [
     {
+      "uuid": "6466b30d-519c-438e-935d-388224ab5223",
       "description": "year not divisible by 4 in common year",
       "property": "leapYear",
       "input": {
@@ -11,6 +12,7 @@
       "expected": false
     },
     {
+      "uuid": "ac227e82-ee82-4a09-9eb6-4f84331ffdb0",
       "description": "year divisible by 2, not divisible by 4 in common year",
       "property": "leapYear",
       "input": {
@@ -19,6 +21,7 @@
       "expected": false
     },
     {
+      "uuid": "4fe9b84c-8e65-489e-970b-856d60b8b78e",
       "description": "year divisible by 4, not divisible by 100 in leap year",
       "property": "leapYear",
       "input": {
@@ -27,6 +30,7 @@
       "expected": true
     },
     {
+      "uuid": "7fc6aed7-e63c-48f5-ae05-5fe182f60a5d",
       "description": "year divisible by 4 and 5 is still a leap year",
       "property": "leapYear",
       "input": {
@@ -35,6 +39,7 @@
       "expected": true
     },
     {
+      "uuid": "78a7848f-9667-4192-ae53-87b30c9a02dd",
       "description": "year divisible by 100, not divisible by 400 in common year",
       "property": "leapYear",
       "input": {
@@ -43,6 +48,7 @@
       "expected": false
     },
     {
+      "uuid": "9d70f938-537c-40a6-ba19-f50739ce8bac",
       "description": "year divisible by 100 but not by 3 is still not a leap year",
       "property": "leapYear",
       "input": {
@@ -51,6 +57,7 @@
       "expected": false
     },
     {
+      "uuid": "42ee56ad-d3e6-48f1-8e3f-c84078d916fc",
       "description": "year divisible by 400 in leap year",
       "property": "leapYear",
       "input": {
@@ -59,6 +66,7 @@
       "expected": true
     },
     {
+      "uuid": "57902c77-6fe9-40de-8302-587b5c27121e",
       "description": "year divisible by 400 but not by 125 is still a leap year",
       "property": "leapYear",
       "input": {
@@ -67,6 +75,7 @@
       "expected": true
     },
     {
+      "uuid": "c30331f6-f9f6-4881-ad38-8ca8c12520c1",
       "description": "year divisible by 200, not divisible by 400 in common year",
       "property": "leapYear",
       "input": {
diff --git a/exercises/list-ops/canonical-data.json b/exercises/list-ops/canonical-data.json
index 96b5f11ebb..f07082be9b 100644
--- a/exercises/list-ops/canonical-data.json
+++ b/exercises/list-ops/canonical-data.json
@@ -11,6 +11,7 @@
       "description": "append entries to a list and return the new list",
       "cases": [
         {
+          "uuid": "485b9452-bf94-40f7-a3db-c3cf4850066a",
           "description": "empty lists",
           "property": "append",
           "input": {
@@ -20,6 +21,7 @@
           "expected": []
         },
         {
+          "uuid": "2c894696-b609-4569-b149-8672134d340a",
           "description": "list to empty list",
           "property": "append",
           "input": {
@@ -29,6 +31,7 @@
           "expected": [1, 2, 3, 4]
         },
         {
+          "uuid": "71dcf5eb-73ae-4a0e-b744-a52ee387922f",
           "description": "non-empty lists",
           "property": "append",
           "input": {
@@ -43,6 +46,7 @@
       "description": "concatenate a list of lists",
       "cases": [
         {
+          "uuid": "28444355-201b-4af2-a2f6-5550227bde21",
           "description": "empty list",
           "property": "concat",
           "input": {
@@ -51,6 +55,7 @@
           "expected": []
         },
         {
+          "uuid": "331451c1-9573-42a1-9869-2d06e3b389a9",
           "description": "list of lists",
           "property": "concat",
           "input": {
@@ -59,6 +64,7 @@
           "expected": [1, 2, 3, 4, 5, 6]
         },
         {
+          "uuid": "d6ecd72c-197f-40c3-89a4-aa1f45827e09",
           "description": "list of nested lists",
           "property": "concat",
           "input": {
@@ -72,6 +78,7 @@
       "description": "filter list returning only values that satisfy the filter function",
       "cases": [
         {
+          "uuid": "0524fba8-3e0f-4531-ad2b-f7a43da86a16",
           "description": "empty list",
           "property": "filter",
           "input": {
@@ -81,6 +88,7 @@
           "expected": []
         },
         {
+          "uuid": "88494bd5-f520-4edb-8631-88e415b62d24",
           "description": "non-empty list",
           "property": "filter",
           "input": {
@@ -95,6 +103,7 @@
       "description": "returns the length of a list",
       "cases": [
         {
+          "uuid": "1cf0b92d-8d96-41d5-9c21-7b3c37cb6aad",
           "description": "empty list",
           "property": "length",
           "input": {
@@ -103,6 +112,7 @@
           "expected": 0
         },
         {
+          "uuid": "d7b8d2d9-2d16-44c4-9a19-6e5f237cb71e",
           "description": "non-empty list",
           "property": "length",
           "input": {
@@ -116,6 +126,7 @@
       "description": "return a list of elements whose values equal the list value transformed by the mapping function",
       "cases": [
         {
+          "uuid": "c0bc8962-30e2-4bec-9ae4-668b8ecd75aa",
           "description": "empty list",
           "property": "map",
           "input": {
@@ -125,6 +136,7 @@
           "expected": []
         },
         {
+          "uuid": "11e71a95-e78b-4909-b8e4-60cdcaec0e91",
           "description": "non-empty list",
           "property": "map",
           "input": {
@@ -139,6 +151,7 @@
       "description": "folds (reduces) the given list from the left with a function",
       "cases": [
         {
+          "uuid": "613b20b7-1873-4070-a3a6-70ae5f50d7cc",
           "description": "empty list",
           "property": "foldl",
           "input": {
@@ -149,6 +162,7 @@
           "expected": 2
         },
         {
+          "uuid": "e56df3eb-9405-416a-b13a-aabb4c3b5194",
           "description": "direction independent function applied to non-empty list",
           "property": "foldl",
           "input": {
@@ -159,6 +173,7 @@
           "expected": 15
         },
         {
+          "uuid": "d2cf5644-aee1-4dfc-9b88-06896676fe27",
           "description": "direction dependent function applied to non-empty list",
           "property": "foldl",
           "input": {
@@ -174,6 +189,7 @@
       "description": "folds (reduces) the given list from the right with a function",
       "cases": [
         {
+          "uuid": "aeb576b9-118e-4a57-a451-db49fac20fdc",
           "description": "empty list",
           "property": "foldr",
           "input": {
@@ -184,6 +200,7 @@
           "expected": 2
         },
         {
+          "uuid": "c4b64e58-313e-4c47-9c68-7764964efb8e",
           "description": "direction independent function applied to non-empty list",
           "property": "foldr",
           "input": {
@@ -194,6 +211,7 @@
           "expected": 15
         },
         {
+          "uuid": "be396a53-c074-4db3-8dd6-f7ed003cce7c",
           "description": "direction dependent function applied to non-empty list",
           "property": "foldr",
           "input": {
@@ -209,6 +227,7 @@
       "description": "reverse the elements of the list",
       "cases": [
         {
+          "uuid": "94231515-050e-4841-943d-d4488ab4ee30",
           "description": "empty list",
           "property": "reverse",
           "input": {
@@ -217,6 +236,7 @@
           "expected": []
         },
         {
+          "uuid": "fcc03d1e-42e0-4712-b689-d54ad761f360",
           "description": "non-empty list",
           "property": "reverse",
           "input": {
@@ -225,6 +245,7 @@
           "expected": [7, 5, 3, 1]
         },
         {
+          "uuid": "40872990-b5b8-4cb8-9085-d91fc0d05d26",
           "description": "list of lists is not flattened",
           "property": "reverse",
           "input": {
diff --git a/exercises/luhn/canonical-data.json b/exercises/luhn/canonical-data.json
index 324fc7bca6..5e6803c0ff 100644
--- a/exercises/luhn/canonical-data.json
+++ b/exercises/luhn/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.7.0",
   "cases": [
     {
+      "uuid": "792a7082-feb7-48c7-b88b-bbfec160865e",
       "description": "single digit strings can not be valid",
       "property": "valid",
       "input": {
@@ -11,6 +12,7 @@
       "expected": false
     },
     {
+      "uuid": "698a7924-64d4-4d89-8daa-32e1aadc271e",
       "description": "a single zero is invalid",
       "property": "valid",
       "input": {
@@ -19,6 +21,7 @@
       "expected": false
     },
     {
+      "uuid": "73c2f62b-9b10-4c9f-9a04-83cee7367965",
       "description": "a simple valid SIN that remains valid if reversed",
       "property": "valid",
       "input": {
@@ -27,6 +30,7 @@
       "expected": true
     },
     {
+      "uuid": "9369092e-b095-439f-948d-498bd076be11",
       "description": "a simple valid SIN that becomes invalid if reversed",
       "property": "valid",
       "input": {
@@ -35,6 +39,7 @@
       "expected": true
     },
     {
+      "uuid": "8f9f2350-1faf-4008-ba84-85cbb93ffeca",
       "description": "a valid Canadian SIN",
       "property": "valid",
       "input": {
@@ -43,6 +48,7 @@
       "expected": true
     },
     {
+      "uuid": "1cdcf269-6560-44fc-91f6-5819a7548737",
       "description": "invalid Canadian SIN",
       "property": "valid",
       "input": {
@@ -51,6 +57,7 @@
       "expected": false
     },
     {
+      "uuid": "656c48c1-34e8-4e60-9a5a-aad8a367810a",
       "description": "invalid credit card",
       "property": "valid",
       "input": {
@@ -59,6 +66,7 @@
       "expected": false
     },
     {
+      "uuid": "20e67fad-2121-43ed-99a8-14b5b856adb9",
       "description": "invalid long number with an even remainder",
       "property": "valid",
       "input": {
@@ -67,6 +75,7 @@
       "expected": false
     },
     {
+      "uuid": "ad2a0c5f-84ed-4e5b-95da-6011d6f4f0aa",
       "description": "valid number with an even number of digits",
       "property": "valid",
       "input": {
@@ -75,6 +84,7 @@
       "expected": true
     },
     {
+      "uuid": "ef081c06-a41f-4761-8492-385e13c8202d",
       "description": "valid number with an odd number of spaces",
       "property": "valid",
       "input": {
@@ -83,6 +93,7 @@
       "expected": true
     },
     {
+      "uuid": "bef66f64-6100-4cbb-8f94-4c9713c5e5b2",
       "description": "valid strings with a non-digit added at the end become invalid",
       "property": "valid",
       "input": {
@@ -91,6 +102,7 @@
       "expected": false
     },
     {
+      "uuid": "2177e225-9ce7-40f6-b55d-fa420e62938e",
       "description": "valid strings with punctuation included become invalid",
       "property": "valid",
       "input": {
@@ -99,6 +111,7 @@
       "expected": false
     },
     {
+      "uuid": "ebf04f27-9698-45e1-9afe-7e0851d0fe8d",
       "description": "valid strings with symbols included become invalid",
       "property": "valid",
       "input": {
@@ -107,6 +120,7 @@
       "expected": false
     },
     {
+      "uuid": "08195c5e-ce7f-422c-a5eb-3e45fece68ba",
       "description": "single zero with space is invalid",
       "property": "valid",
       "input": {
@@ -115,6 +129,7 @@
       "expected": false
     },
     {
+      "uuid": "12e63a3c-f866-4a79-8c14-b359fc386091",
       "description": "more than a single zero is valid",
       "property": "valid",
       "input": {
@@ -123,6 +138,7 @@
       "expected": true
     },
     {
+      "uuid": "ab56fa80-5de8-4735-8a4a-14dae588663e",
       "description": "input digit 9 is correctly converted to output digit 9",
       "property": "valid",
       "input": {
@@ -135,6 +151,7 @@
         "Convert non-digits to their ascii values and then offset them by 48 sometimes accidentally declare an invalid string to be valid.",
         "This test is designed to avoid that solution."
       ],
+      "uuid": "39a06a5a-5bad-4e0f-b215-b042d46209b1",
       "description": "using ascii value for non-doubled non-digit isn't allowed",
       "property": "valid",
       "input": {
@@ -147,6 +164,7 @@
         "Convert non-digits to their ascii values and then offset them by 48 sometimes accidentally declare an invalid string to be valid.",
         "This test is designed to avoid that solution."
       ],
+      "uuid": "f94cf191-a62f-4868-bc72-7253114aa157",
       "description": "using ascii value for doubled non-digit isn't allowed",
       "property": "valid",
       "input": {
diff --git a/exercises/markdown/canonical-data.json b/exercises/markdown/canonical-data.json
index 00db645110..0485bfc707 100644
--- a/exercises/markdown/canonical-data.json
+++ b/exercises/markdown/canonical-data.json
@@ -6,6 +6,7 @@
   ],
   "cases": [
     {
+      "uuid": "e75c8103-a6b8-45d9-84ad-e68520545f6e",
       "description": "parses normal text as a paragraph",
       "property": "parse",
       "input": {
@@ -14,6 +15,7 @@
       "expected": "<p>This will be a paragraph</p>"
     },
     {
+      "uuid": "69a4165d-9bf8-4dd7-bfdc-536eaca80a6a",
       "description": "parsing italics",
       "property": "parse",
       "input": {
@@ -22,6 +24,7 @@
       "expected": "<p><em>This will be italic</em></p>"
     },
     {
+      "uuid": "ec345a1d-db20-4569-a81a-172fe0cad8a1",
       "description": "parsing bold text",
       "property": "parse",
       "input": {
@@ -30,6 +33,7 @@
       "expected": "<p><strong>This will be bold</strong></p>"
     },
     {
+      "uuid": "51164ed4-5641-4909-8fab-fbaa9d37d5a8",
       "description": "mixed normal, italics and bold text",
       "property": "parse",
       "input": {
@@ -38,6 +42,7 @@
       "expected": "<p>This will <em>be</em> <strong>mixed</strong></p>"
     },
     {
+      "uuid": "ad85f60d-0edd-4c6a-a9b1-73e1c4790d15",
       "description": "with h1 header level",
       "property": "parse",
       "input": {
@@ -46,6 +51,7 @@
       "expected": "<h1>This will be an h1</h1>"
     },
     {
+      "uuid": "d0f7a31f-6935-44ac-8a9a-1e8ab16af77f",
       "description": "with h2 header level",
       "property": "parse",
       "input": {
@@ -54,6 +60,7 @@
       "expected": "<h2>This will be an h2</h2>"
     },
     {
+      "uuid": "13b5f410-33f5-44f0-a6a7-cfd4ab74b5d5",
       "description": "with h6 header level",
       "property": "parse",
       "input": {
@@ -62,6 +69,7 @@
       "expected": "<h6>This will be an h6</h6>"
     },
     {
+      "uuid": "25288a2b-8edc-45db-84cf-0b6c6ee034d6",
       "description": "unordered lists",
       "property": "parse",
       "input": {
@@ -70,6 +78,7 @@
       "expected": "<ul><li>Item 1</li><li>Item 2</li></ul>"
     },
     {
+      "uuid": "7bf92413-df8f-4de8-9184-b724f363c3da",
       "description": "With a little bit of everything",
       "property": "parse",
       "input": {
@@ -78,6 +87,7 @@
       "expected": "<h1>Header!</h1><ul><li><strong>Bold Item</strong></li><li><em>Italic Item</em></li></ul>"
     },
     {
+        "uuid": "0b3ed1ec-3991-4b8b-8518-5cb73d4a64fe",
         "description": "with markdown symbols in the header text that should not be interpreted",
         "property": "parse",
         "input": {
@@ -86,6 +96,7 @@
         "expected": "<h1>This is a header with # and * in the text</h1>"
     },
     {
+        "uuid": "113a2e58-78de-4efa-90e9-20972224d759",
         "description": "with markdown symbols in the list item text that should not be interpreted",
         "property": "parse",
         "input": {
@@ -94,6 +105,7 @@
         "expected": "<ul><li>Item 1 with a # in the text</li><li>Item 2 with * in the text</li></ul>"
     },
     {
+        "uuid": "e65e46e2-17b7-4216-b3ac-f44a1b9bcdb4",
         "description": "with markdown symbols in the paragraph text that should not be interpreted",
         "property": "parse",
         "input": {
@@ -102,6 +114,7 @@
         "expected": "<p>This is a paragraph with # and * in the text</p>"
     },
     {
+        "uuid": "f0bbbbde-0f52-4c0c-99ec-be4c60126dd4",
         "description": "unordered lists close properly with preceding and following lines",
         "property": "parse",
         "input": {
diff --git a/exercises/matching-brackets/canonical-data.json b/exercises/matching-brackets/canonical-data.json
index 18d729b98b..0aae22b509 100644
--- a/exercises/matching-brackets/canonical-data.json
+++ b/exercises/matching-brackets/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "2.0.0",
   "cases": [
     {
+      "uuid": "81ec11da-38dd-442a-bcf9-3de7754609a5",
       "description": "paired square brackets",
       "property": "isPaired",
       "input": {
@@ -11,6 +12,7 @@
       "expected": true
     },
     {
+      "uuid": "287f0167-ac60-4b64-8452-a0aa8f4e5238",
       "description": "empty string",
       "property": "isPaired",
       "input": {
@@ -19,6 +21,7 @@
       "expected": true
     },
     {
+      "uuid": "6c3615a3-df01-4130-a731-8ef5f5d78dac",
       "description": "unpaired brackets",
       "property": "isPaired",
       "input": {
@@ -27,6 +30,7 @@
       "expected": false
     },
     {
+      "uuid": "9d414171-9b98-4cac-a4e5-941039a97a77",
       "description": "wrong ordered brackets",
       "property": "isPaired",
       "input": {
@@ -35,6 +39,7 @@
       "expected": false
     },
     {
+      "uuid": "f0f97c94-a149-4736-bc61-f2c5148ffb85",
       "description": "wrong closing bracket",
       "property": "isPaired",
       "input": {
@@ -43,6 +48,7 @@
       "expected": false
     },
     {
+      "uuid": "754468e0-4696-4582-a30e-534d47d69756",
       "description": "paired with whitespace",
       "property": "isPaired",
       "input": {
@@ -51,6 +57,7 @@
       "expected": true
     },
     {
+      "uuid": "ba84f6ee-8164-434a-9c3e-b02c7f8e8545",
       "description": "partially paired brackets",
       "property": "isPaired",
       "input": {
@@ -59,6 +66,7 @@
       "expected": false
     },
     {
+      "uuid": "3c86c897-5ff3-4a2b-ad9b-47ac3a30651d",
       "description": "simple nested brackets",
       "property": "isPaired",
       "input": {
@@ -67,6 +75,7 @@
       "expected": true
     },
     {
+      "uuid": "2d137f2c-a19e-4993-9830-83967a2d4726",
       "description": "several paired brackets",
       "property": "isPaired",
       "input": {
@@ -75,6 +84,7 @@
       "expected": true
     },
     {
+      "uuid": "2e1f7b56-c137-4c92-9781-958638885a44",
       "description": "paired and nested brackets",
       "property": "isPaired",
       "input": {
@@ -83,6 +93,7 @@
       "expected": true
     },
     {
+      "uuid": "84f6233b-e0f7-4077-8966-8085d295c19b",
       "description": "unopened closing brackets",
       "property": "isPaired",
       "input": {
@@ -91,6 +102,7 @@
       "expected": false
     },
     {
+      "uuid": "9b18c67d-7595-4982-b2c5-4cb949745d49",
       "description": "unpaired and nested brackets",
       "property": "isPaired",
       "input": {
@@ -99,6 +111,7 @@
       "expected": false
     },
     {
+      "uuid": "a0205e34-c2ac-49e6-a88a-899508d7d68e",
       "description": "paired and wrong nested brackets",
       "property": "isPaired",
       "input": {
@@ -107,6 +120,7 @@
       "expected": false
     },
     {
+      "uuid": "ef47c21b-bcfd-4998-844c-7ad5daad90a8",
       "description": "paired and incomplete brackets",
       "property": "isPaired",
       "input": {
@@ -115,6 +129,7 @@
       "expected": false
     },
     {
+      "uuid": "a4675a40-a8be-4fc2-bc47-2a282ce6edbe",
       "description": "too many closing brackets",
       "property": "isPaired",
       "input": {
@@ -123,6 +138,7 @@
       "expected": false
     },
     {
+      "uuid": "99255f93-261b-4435-a352-02bdecc9bdf2",
       "description": "math expression",
       "property": "isPaired",
       "input": {
@@ -131,6 +147,7 @@
       "expected": true
     },
     {
+      "uuid": "8e357d79-f302-469a-8515-2561877256a1",
       "description": "complex latex expression",
       "property": "isPaired",
       "input": {
diff --git a/exercises/matrix/canonical-data.json b/exercises/matrix/canonical-data.json
index f94c28d1c7..7d5a9182ca 100644
--- a/exercises/matrix/canonical-data.json
+++ b/exercises/matrix/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.3.0",
   "cases": [
     {
+      "uuid": "ca733dab-9d85-4065-9ef6-a880a951dafd",
       "description": "extract row from one number matrix",
       "property": "row",
       "input": {
@@ -12,6 +13,7 @@
       "expected": [1]
     },
     {
+      "uuid": "5c93ec93-80e1-4268-9fc2-63bc7d23385c",
       "description": "can extract row",
       "property": "row",
       "input": {
@@ -21,6 +23,7 @@
       "expected": [3, 4]
     },
     {
+      "uuid": "2f1aad89-ad0f-4bd2-9919-99a8bff0305a",
       "description": "extract row where numbers have different widths",
       "property": "row",
       "input": {
@@ -30,6 +33,7 @@
       "expected": [10, 20]
     },
     {
+      "uuid": "68f7f6ba-57e2-4e87-82d0-ad09889b5204",
       "description": "can extract row from non-square matrix with no corresponding column",
       "property": "row",
       "input": {
@@ -39,6 +43,7 @@
       "expected": [8, 7, 6]
     },
     {
+      "uuid": "e8c74391-c93b-4aed-8bfe-f3c9beb89ebb",
       "description": "extract column from one number matrix",
       "property": "column",
       "input": {
@@ -48,6 +53,7 @@
       "expected": [1]
     },
     {
+      "uuid": "7136bdbd-b3dc-48c4-a10c-8230976d3727",
       "description": "can extract column",
       "property": "column",
       "input": {
@@ -57,6 +63,7 @@
       "expected": [3, 6, 9]
     },
     {
+      "uuid": "ad64f8d7-bba6-4182-8adf-0c14de3d0eca",
       "description": "can extract column from non-square matrix with no corresponding row",
       "property": "column",
       "input": {
@@ -66,6 +73,7 @@
       "expected": [4, 8, 6]
     },
     {
+      "uuid": "9eddfa5c-8474-440e-ae0a-f018c2a0dd89",
       "description": "extract column where numbers have different widths",
       "property": "column",
       "input": {
diff --git a/exercises/meetup/canonical-data.json b/exercises/meetup/canonical-data.json
index 5e31a774cf..d7ed47dca1 100644
--- a/exercises/meetup/canonical-data.json
+++ b/exercises/meetup/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "d7f8eadd-d4fc-46ee-8a20-e97bd3fd01c8",
       "description": "monteenth of May 2013",
       "property": "meetup",
       "input": {
@@ -14,6 +15,7 @@
       "expected": "2013-05-13"
     },
     {
+      "uuid": "f78373d1-cd53-4a7f-9d37-e15bf8a456b4",
       "description": "monteenth of August 2013",
       "property": "meetup",
       "input": {
@@ -25,6 +27,7 @@
       "expected": "2013-08-19"
     },
     {
+      "uuid": "8c78bea7-a116-425b-9c6b-c9898266d92a",
       "description": "monteenth of September 2013",
       "property": "meetup",
       "input": {
@@ -36,6 +39,7 @@
       "expected": "2013-09-16"
     },
     {
+      "uuid": "cfef881b-9dc9-4d0b-8de4-82d0f39fc271",
       "description": "tuesteenth of March 2013",
       "property": "meetup",
       "input": {
@@ -47,6 +51,7 @@
       "expected": "2013-03-19"
     },
     {
+      "uuid": "69048961-3b00-41f9-97ee-eb6d83a8e92b",
       "description": "tuesteenth of April 2013",
       "property": "meetup",
       "input": {
@@ -58,6 +63,7 @@
       "expected": "2013-04-16"
     },
     {
+      "uuid": "d30bade8-3622-466a-b7be-587414e0caa6",
       "description": "tuesteenth of August 2013",
       "property": "meetup",
       "input": {
@@ -69,6 +75,7 @@
       "expected": "2013-08-13"
     },
     {
+      "uuid": "8db4b58b-92f3-4687-867b-82ee1a04f851",
       "description": "wednesteenth of January 2013",
       "property": "meetup",
       "input": {
@@ -80,6 +87,7 @@
       "expected": "2013-01-16"
     },
     {
+      "uuid": "6c27a2a2-28f8-487f-ae81-35d08c4664f7",
       "description": "wednesteenth of February 2013",
       "property": "meetup",
       "input": {
@@ -91,6 +99,7 @@
       "expected": "2013-02-13"
     },
     {
+      "uuid": "008a8674-1958-45b5-b8e6-c2c9960d973a",
       "description": "wednesteenth of June 2013",
       "property": "meetup",
       "input": {
@@ -102,6 +111,7 @@
       "expected": "2013-06-19"
     },
     {
+      "uuid": "e4abd5e3-57cb-4091-8420-d97e955c0dbd",
       "description": "thursteenth of May 2013",
       "property": "meetup",
       "input": {
@@ -113,6 +123,7 @@
       "expected": "2013-05-16"
     },
     {
+      "uuid": "85da0b0f-eace-4297-a6dd-63588d5055b4",
       "description": "thursteenth of June 2013",
       "property": "meetup",
       "input": {
@@ -124,6 +135,7 @@
       "expected": "2013-06-13"
     },
     {
+      "uuid": "ecf64f9b-8413-489b-bf6e-128045f70bcc",
       "description": "thursteenth of September 2013",
       "property": "meetup",
       "input": {
@@ -135,6 +147,7 @@
       "expected": "2013-09-19"
     },
     {
+      "uuid": "ac4e180c-7d0a-4d3d-b05f-f564ebb584ca",
       "description": "friteenth of April 2013",
       "property": "meetup",
       "input": {
@@ -146,6 +159,7 @@
       "expected": "2013-04-19"
     },
     {
+      "uuid": "b79101c7-83ad-4f8f-8ec8-591683296315",
       "description": "friteenth of August 2013",
       "property": "meetup",
       "input": {
@@ -157,6 +171,7 @@
       "expected": "2013-08-16"
     },
     {
+      "uuid": "6ed38b9f-0072-4901-bd97-7c8b8b0ef1b8",
       "description": "friteenth of September 2013",
       "property": "meetup",
       "input": {
@@ -168,6 +183,7 @@
       "expected": "2013-09-13"
     },
     {
+      "uuid": "dfae03ed-9610-47de-a632-655ab01e1e7c",
       "description": "saturteenth of February 2013",
       "property": "meetup",
       "input": {
@@ -179,6 +195,7 @@
       "expected": "2013-02-16"
     },
     {
+      "uuid": "ec02e3e1-fc72-4a3c-872f-a53fa8ab358e",
       "description": "saturteenth of April 2013",
       "property": "meetup",
       "input": {
@@ -190,6 +207,7 @@
       "expected": "2013-04-13"
     },
     {
+      "uuid": "d983094b-7259-4195-b84e-5d09578c89d9",
       "description": "saturteenth of October 2013",
       "property": "meetup",
       "input": {
@@ -201,6 +219,7 @@
       "expected": "2013-10-19"
     },
     {
+      "uuid": "d84a2a2e-f745-443a-9368-30051be60c2e",
       "description": "sunteenth of May 2013",
       "property": "meetup",
       "input": {
@@ -212,6 +231,7 @@
       "expected": "2013-05-19"
     },
     {
+      "uuid": "0e64bc53-92a3-4f61-85b2-0b7168c7ce5a",
       "description": "sunteenth of June 2013",
       "property": "meetup",
       "input": {
@@ -223,6 +243,7 @@
       "expected": "2013-06-16"
     },
     {
+      "uuid": "de87652c-185e-4854-b3ae-04cf6150eead",
       "description": "sunteenth of October 2013",
       "property": "meetup",
       "input": {
@@ -234,6 +255,7 @@
       "expected": "2013-10-13"
     },
     {
+      "uuid": "2cbfd0f5-ba3a-46da-a8cc-0fe4966d3411",
       "description": "first Monday of March 2013",
       "property": "meetup",
       "input": {
@@ -245,6 +267,7 @@
       "expected": "2013-03-04"
     },
     {
+      "uuid": "a6168c7c-ed95-4bb3-8f92-c72575fc64b0",
       "description": "first Monday of April 2013",
       "property": "meetup",
       "input": {
@@ -256,6 +279,7 @@
       "expected": "2013-04-01"
     },
     {
+      "uuid": "1bfc620f-1c54-4bbd-931f-4a1cd1036c20",
       "description": "first Tuesday of May 2013",
       "property": "meetup",
       "input": {
@@ -267,6 +291,7 @@
       "expected": "2013-05-07"
     },
     {
+      "uuid": "12959c10-7362-4ca0-a048-50cf1c06e3e2",
       "description": "first Tuesday of June 2013",
       "property": "meetup",
       "input": {
@@ -278,6 +303,7 @@
       "expected": "2013-06-04"
     },
     {
+      "uuid": "1033dc66-8d0b-48a1-90cb-270703d59d1d",
       "description": "first Wednesday of July 2013",
       "property": "meetup",
       "input": {
@@ -289,6 +315,7 @@
       "expected": "2013-07-03"
     },
     {
+      "uuid": "b89185b9-2f32-46f4-a602-de20b09058f6",
       "description": "first Wednesday of August 2013",
       "property": "meetup",
       "input": {
@@ -300,6 +327,7 @@
       "expected": "2013-08-07"
     },
     {
+      "uuid": "53aedc4d-b2c8-4dfb-abf7-a8dc9cdceed5",
       "description": "first Thursday of September 2013",
       "property": "meetup",
       "input": {
@@ -311,6 +339,7 @@
       "expected": "2013-09-05"
     },
     {
+      "uuid": "b420a7e3-a94c-4226-870a-9eb3a92647f0",
       "description": "first Thursday of October 2013",
       "property": "meetup",
       "input": {
@@ -322,6 +351,7 @@
       "expected": "2013-10-03"
     },
     {
+      "uuid": "61df3270-28b4-4713-bee2-566fa27302ca",
       "description": "first Friday of November 2013",
       "property": "meetup",
       "input": {
@@ -333,6 +363,7 @@
       "expected": "2013-11-01"
     },
     {
+      "uuid": "cad33d4d-595c-412f-85cf-3874c6e07abf",
       "description": "first Friday of December 2013",
       "property": "meetup",
       "input": {
@@ -344,6 +375,7 @@
       "expected": "2013-12-06"
     },
     {
+      "uuid": "a2869b52-5bba-44f0-a863-07bd1f67eadb",
       "description": "first Saturday of January 2013",
       "property": "meetup",
       "input": {
@@ -355,6 +387,7 @@
       "expected": "2013-01-05"
     },
     {
+      "uuid": "3585315a-d0db-4ea1-822e-0f22e2a645f5",
       "description": "first Saturday of February 2013",
       "property": "meetup",
       "input": {
@@ -366,6 +399,7 @@
       "expected": "2013-02-02"
     },
     {
+      "uuid": "c49e9bd9-8ccf-4cf2-947a-0ccd4e4f10b1",
       "description": "first Sunday of March 2013",
       "property": "meetup",
       "input": {
@@ -377,6 +411,7 @@
       "expected": "2013-03-03"
     },
     {
+      "uuid": "1513328b-df53-4714-8677-df68c4f9366c",
       "description": "first Sunday of April 2013",
       "property": "meetup",
       "input": {
@@ -388,6 +423,7 @@
       "expected": "2013-04-07"
     },
     {
+      "uuid": "49e083af-47ec-4018-b807-62ef411efed7",
       "description": "second Monday of March 2013",
       "property": "meetup",
       "input": {
@@ -399,6 +435,7 @@
       "expected": "2013-03-11"
     },
     {
+      "uuid": "6cb79a73-38fe-4475-9101-9eec36cf79e5",
       "description": "second Monday of April 2013",
       "property": "meetup",
       "input": {
@@ -410,6 +447,7 @@
       "expected": "2013-04-08"
     },
     {
+      "uuid": "4c39b594-af7e-4445-aa03-bf4f8effd9a1",
       "description": "second Tuesday of May 2013",
       "property": "meetup",
       "input": {
@@ -421,6 +459,7 @@
       "expected": "2013-05-14"
     },
     {
+      "uuid": "41b32c34-2e39-40e3-b790-93539aaeb6dd",
       "description": "second Tuesday of June 2013",
       "property": "meetup",
       "input": {
@@ -432,6 +471,7 @@
       "expected": "2013-06-11"
     },
     {
+      "uuid": "90a160c5-b5d9-4831-927f-63a78b17843d",
       "description": "second Wednesday of July 2013",
       "property": "meetup",
       "input": {
@@ -443,6 +483,7 @@
       "expected": "2013-07-10"
     },
     {
+      "uuid": "23b98ce7-8dd5-41a1-9310-ef27209741cb",
       "description": "second Wednesday of August 2013",
       "property": "meetup",
       "input": {
@@ -454,6 +495,7 @@
       "expected": "2013-08-14"
     },
     {
+      "uuid": "447f1960-27ca-4729-bc3f-f36043f43ed0",
       "description": "second Thursday of September 2013",
       "property": "meetup",
       "input": {
@@ -465,6 +507,7 @@
       "expected": "2013-09-12"
     },
     {
+      "uuid": "c9aa2687-300c-4e79-86ca-077849a81bde",
       "description": "second Thursday of October 2013",
       "property": "meetup",
       "input": {
@@ -476,6 +519,7 @@
       "expected": "2013-10-10"
     },
     {
+      "uuid": "a7e11ef3-6625-4134-acda-3e7195421c09",
       "description": "second Friday of November 2013",
       "property": "meetup",
       "input": {
@@ -487,6 +531,7 @@
       "expected": "2013-11-08"
     },
     {
+      "uuid": "8b420e5f-9290-4106-b5ae-022f3e2a3e41",
       "description": "second Friday of December 2013",
       "property": "meetup",
       "input": {
@@ -498,6 +543,7 @@
       "expected": "2013-12-13"
     },
     {
+      "uuid": "80631afc-fc11-4546-8b5f-c12aaeb72b4f",
       "description": "second Saturday of January 2013",
       "property": "meetup",
       "input": {
@@ -509,6 +555,7 @@
       "expected": "2013-01-12"
     },
     {
+      "uuid": "e34d43ac-f470-44c2-aa5f-e97b78ecaf83",
       "description": "second Saturday of February 2013",
       "property": "meetup",
       "input": {
@@ -520,6 +567,7 @@
       "expected": "2013-02-09"
     },
     {
+      "uuid": "a57d59fd-1023-47ad-b0df-a6feb21b44fc",
       "description": "second Sunday of March 2013",
       "property": "meetup",
       "input": {
@@ -531,6 +579,7 @@
       "expected": "2013-03-10"
     },
     {
+      "uuid": "a829a8b0-abdd-4ad1-b66c-5560d843c91a",
       "description": "second Sunday of April 2013",
       "property": "meetup",
       "input": {
@@ -542,6 +591,7 @@
       "expected": "2013-04-14"
     },
     {
+      "uuid": "501a8a77-6038-4fc0-b74c-33634906c29d",
       "description": "third Monday of March 2013",
       "property": "meetup",
       "input": {
@@ -553,6 +603,7 @@
       "expected": "2013-03-18"
     },
     {
+      "uuid": "49e4516e-cf32-4a58-8bbc-494b7e851c92",
       "description": "third Monday of April 2013",
       "property": "meetup",
       "input": {
@@ -564,6 +615,7 @@
       "expected": "2013-04-15"
     },
     {
+      "uuid": "4db61095-f7c7-493c-85f1-9996ad3012c7",
       "description": "third Tuesday of May 2013",
       "property": "meetup",
       "input": {
@@ -575,6 +627,7 @@
       "expected": "2013-05-21"
     },
     {
+      "uuid": "714fc2e3-58d0-4b91-90fd-61eefd2892c0",
       "description": "third Tuesday of June 2013",
       "property": "meetup",
       "input": {
@@ -586,6 +639,7 @@
       "expected": "2013-06-18"
     },
     {
+      "uuid": "b08a051a-2c80-445b-9b0e-524171a166d1",
       "description": "third Wednesday of July 2013",
       "property": "meetup",
       "input": {
@@ -597,6 +651,7 @@
       "expected": "2013-07-17"
     },
     {
+      "uuid": "80bb9eff-3905-4c61-8dc9-bb03016d8ff8",
       "description": "third Wednesday of August 2013",
       "property": "meetup",
       "input": {
@@ -608,6 +663,7 @@
       "expected": "2013-08-21"
     },
     {
+      "uuid": "fa52a299-f77f-4784-b290-ba9189fbd9c9",
       "description": "third Thursday of September 2013",
       "property": "meetup",
       "input": {
@@ -619,6 +675,7 @@
       "expected": "2013-09-19"
     },
     {
+      "uuid": "f74b1bc6-cc5c-4bf1-ba69-c554a969eb38",
       "description": "third Thursday of October 2013",
       "property": "meetup",
       "input": {
@@ -630,6 +687,7 @@
       "expected": "2013-10-17"
     },
     {
+      "uuid": "8900f3b0-801a-466b-a866-f42d64667abd",
       "description": "third Friday of November 2013",
       "property": "meetup",
       "input": {
@@ -641,6 +699,7 @@
       "expected": "2013-11-15"
     },
     {
+      "uuid": "538ac405-a091-4314-9ccd-920c4e38e85e",
       "description": "third Friday of December 2013",
       "property": "meetup",
       "input": {
@@ -652,6 +711,7 @@
       "expected": "2013-12-20"
     },
     {
+      "uuid": "244db35c-2716-4fa0-88ce-afd58e5cf910",
       "description": "third Saturday of January 2013",
       "property": "meetup",
       "input": {
@@ -663,6 +723,7 @@
       "expected": "2013-01-19"
     },
     {
+      "uuid": "dd28544f-f8fa-4f06-9bcd-0ad46ce68e9e",
       "description": "third Saturday of February 2013",
       "property": "meetup",
       "input": {
@@ -674,6 +735,7 @@
       "expected": "2013-02-16"
     },
     {
+      "uuid": "be71dcc6-00d2-4b53-a369-cbfae55b312f",
       "description": "third Sunday of March 2013",
       "property": "meetup",
       "input": {
@@ -685,6 +747,7 @@
       "expected": "2013-03-17"
     },
     {
+      "uuid": "b7d2da84-4290-4ee6-a618-ee124ae78be7",
       "description": "third Sunday of April 2013",
       "property": "meetup",
       "input": {
@@ -696,6 +759,7 @@
       "expected": "2013-04-21"
     },
     {
+      "uuid": "4276dc06-a1bd-4fc2-b6c2-625fee90bc88",
       "description": "fourth Monday of March 2013",
       "property": "meetup",
       "input": {
@@ -707,6 +771,7 @@
       "expected": "2013-03-25"
     },
     {
+      "uuid": "ddbd7976-2deb-4250-8a38-925ac1a8e9a2",
       "description": "fourth Monday of April 2013",
       "property": "meetup",
       "input": {
@@ -718,6 +783,7 @@
       "expected": "2013-04-22"
     },
     {
+      "uuid": "eb714ef4-1656-47cc-913c-844dba4ebddd",
       "description": "fourth Tuesday of May 2013",
       "property": "meetup",
       "input": {
@@ -729,6 +795,7 @@
       "expected": "2013-05-28"
     },
     {
+      "uuid": "16648435-7937-4d2d-b118-c3e38fd084bd",
       "description": "fourth Tuesday of June 2013",
       "property": "meetup",
       "input": {
@@ -740,6 +807,7 @@
       "expected": "2013-06-25"
     },
     {
+      "uuid": "de062bdc-9484-437a-a8c5-5253c6f6785a",
       "description": "fourth Wednesday of July 2013",
       "property": "meetup",
       "input": {
@@ -751,6 +819,7 @@
       "expected": "2013-07-24"
     },
     {
+      "uuid": "c2ce6821-169c-4832-8d37-690ef5d9514a",
       "description": "fourth Wednesday of August 2013",
       "property": "meetup",
       "input": {
@@ -762,6 +831,7 @@
       "expected": "2013-08-28"
     },
     {
+      "uuid": "d462c631-2894-4391-a8e3-dbb98b7a7303",
       "description": "fourth Thursday of September 2013",
       "property": "meetup",
       "input": {
@@ -773,6 +843,7 @@
       "expected": "2013-09-26"
     },
     {
+      "uuid": "9ff1f7b6-1b72-427d-9ee9-82b5bb08b835",
       "description": "fourth Thursday of October 2013",
       "property": "meetup",
       "input": {
@@ -784,6 +855,7 @@
       "expected": "2013-10-24"
     },
     {
+      "uuid": "83bae8ba-1c49-49bc-b632-b7c7e1d7e35f",
       "description": "fourth Friday of November 2013",
       "property": "meetup",
       "input": {
@@ -795,6 +867,7 @@
       "expected": "2013-11-22"
     },
     {
+      "uuid": "de752d2a-a95e-48d2-835b-93363dac3710",
       "description": "fourth Friday of December 2013",
       "property": "meetup",
       "input": {
@@ -806,6 +879,7 @@
       "expected": "2013-12-27"
     },
     {
+      "uuid": "eedd90ad-d581-45db-8312-4c6dcf9cf560",
       "description": "fourth Saturday of January 2013",
       "property": "meetup",
       "input": {
@@ -817,6 +891,7 @@
       "expected": "2013-01-26"
     },
     {
+      "uuid": "669fedcd-912e-48c7-a0a1-228b34af91d0",
       "description": "fourth Saturday of February 2013",
       "property": "meetup",
       "input": {
@@ -828,6 +903,7 @@
       "expected": "2013-02-23"
     },
     {
+      "uuid": "648e3849-ea49-44a5-a8a3-9f2a43b3bf1b",
       "description": "fourth Sunday of March 2013",
       "property": "meetup",
       "input": {
@@ -839,6 +915,7 @@
       "expected": "2013-03-24"
     },
     {
+      "uuid": "f81321b3-99ab-4db6-9267-69c5da5a7823",
       "description": "fourth Sunday of April 2013",
       "property": "meetup",
       "input": {
@@ -850,6 +927,7 @@
       "expected": "2013-04-28"
     },
     {
+      "uuid": "1af5e51f-5488-4548-aee8-11d7d4a730dc",
       "description": "last Monday of March 2013",
       "property": "meetup",
       "input": {
@@ -861,6 +939,7 @@
       "expected": "2013-03-25"
     },
     {
+      "uuid": "f29999f2-235e-4ec7-9dab-26f137146526",
       "description": "last Monday of April 2013",
       "property": "meetup",
       "input": {
@@ -872,6 +951,7 @@
       "expected": "2013-04-29"
     },
     {
+      "uuid": "31b097a0-508e-48ac-bf8a-f63cdcf6dc41",
       "description": "last Tuesday of May 2013",
       "property": "meetup",
       "input": {
@@ -883,6 +963,7 @@
       "expected": "2013-05-28"
     },
     {
+      "uuid": "8c022150-0bb5-4a1f-80f9-88b2e2abcba4",
       "description": "last Tuesday of June 2013",
       "property": "meetup",
       "input": {
@@ -894,6 +975,7 @@
       "expected": "2013-06-25"
     },
     {
+      "uuid": "0e762194-672a-4bdf-8a37-1e59fdacef12",
       "description": "last Wednesday of July 2013",
       "property": "meetup",
       "input": {
@@ -905,6 +987,7 @@
       "expected": "2013-07-31"
     },
     {
+      "uuid": "5016386a-f24e-4bd7-b439-95358f491b66",
       "description": "last Wednesday of August 2013",
       "property": "meetup",
       "input": {
@@ -916,6 +999,7 @@
       "expected": "2013-08-28"
     },
     {
+      "uuid": "12ead1a5-cdf9-4192-9a56-2229e93dd149",
       "description": "last Thursday of September 2013",
       "property": "meetup",
       "input": {
@@ -927,6 +1011,7 @@
       "expected": "2013-09-26"
     },
     {
+      "uuid": "7db89e11-7fbe-4e57-ae3c-0f327fbd7cc7",
       "description": "last Thursday of October 2013",
       "property": "meetup",
       "input": {
@@ -938,6 +1023,7 @@
       "expected": "2013-10-31"
     },
     {
+      "uuid": "e47a739e-b979-460d-9c8a-75c35ca2290b",
       "description": "last Friday of November 2013",
       "property": "meetup",
       "input": {
@@ -949,6 +1035,7 @@
       "expected": "2013-11-29"
     },
     {
+      "uuid": "5bed5aa9-a57a-4e5d-8997-2cc796a5b0ec",
       "description": "last Friday of December 2013",
       "property": "meetup",
       "input": {
@@ -960,6 +1047,7 @@
       "expected": "2013-12-27"
     },
     {
+      "uuid": "61e54cba-76f3-4772-a2b1-bf443fda2137",
       "description": "last Saturday of January 2013",
       "property": "meetup",
       "input": {
@@ -971,6 +1059,7 @@
       "expected": "2013-01-26"
     },
     {
+      "uuid": "8b6a737b-2fa9-444c-b1a2-80ce7a2ec72f",
       "description": "last Saturday of February 2013",
       "property": "meetup",
       "input": {
@@ -982,6 +1071,7 @@
       "expected": "2013-02-23"
     },
     {
+      "uuid": "0b63e682-f429-4d19-9809-4a45bd0242dc",
       "description": "last Sunday of March 2013",
       "property": "meetup",
       "input": {
@@ -993,6 +1083,7 @@
       "expected": "2013-03-31"
     },
     {
+      "uuid": "5232307e-d3e3-4afc-8ba6-4084ad987c00",
       "description": "last Sunday of April 2013",
       "property": "meetup",
       "input": {
@@ -1004,6 +1095,7 @@
       "expected": "2013-04-28"
     },
     {
+      "uuid": "0bbd48e8-9773-4e81-8e71-b9a51711e3c5",
       "description": "last Wednesday of February 2012",
       "property": "meetup",
       "input": {
@@ -1015,6 +1107,7 @@
       "expected": "2012-02-29"
     },
     {
+      "uuid": "fe0936de-7eee-4a48-88dd-66c07ab1fefc",
       "description": "last Wednesday of December 2014",
       "property": "meetup",
       "input": {
@@ -1026,6 +1119,7 @@
       "expected": "2014-12-31"
     },
     {
+      "uuid": "2ccf2488-aafc-4671-a24e-2b6effe1b0e2",
       "description": "last Sunday of February 2015",
       "property": "meetup",
       "input": {
@@ -1037,6 +1131,7 @@
       "expected": "2015-02-22"
     },
     {
+      "uuid": "00c3ce9f-cf36-4b70-90d8-92b32be6830e",
       "description": "first Friday of December 2012",
       "property": "meetup",
       "input": {
@@ -1048,4 +1143,4 @@
       "expected": "2012-12-07"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/micro-blog/canonical-data.json b/exercises/micro-blog/canonical-data.json
index 286d00c200..1e352a2074 100644
--- a/exercises/micro-blog/canonical-data.json
+++ b/exercises/micro-blog/canonical-data.json
@@ -24,6 +24,7 @@
       "description": "Truncate a micro blog post",
       "cases": [
         {
+          "uuid": "b927b57f-7c98-42fd-8f33-fae091dc1efc",
           "description": "English language short",
           "property": "truncate",
           "input": {
@@ -32,6 +33,7 @@
           "expected": "Hi"
         },
         {
+          "uuid": "a3fcdc5b-0ed4-4f49-80f5-b1a293eac2a0",
           "description": "English language long",
           "property": "truncate",
           "input": {
@@ -40,6 +42,7 @@
           "expected": "Hello"
         },
         {
+          "uuid": "01910864-8e15-4007-9c7c-ac956c686e60",
           "description": "German language short (broth)",
           "property": "truncate",
           "input": {
@@ -48,6 +51,7 @@
           "expected": "brühe"
         },
         {
+          "uuid": "f263e488-aefb-478f-a671-b6ba99722543",
           "description": "German language long (bear carpet → beards)",
           "property": "truncate",
           "input": {
@@ -56,6 +60,7 @@
           "expected": "Bärte"
         },
         {
+          "uuid": "0916e8f1-41d7-4402-a110-b08aa000342c",
           "description": "Bulgarian language short (good)",
           "property": "truncate",
           "input": {
@@ -64,6 +69,7 @@
           "expected": "Добър"
         },
         {
+          "uuid": "bed6b89c-03df-4154-98e6-a61a74f61b7d",
           "description": "Greek language short (health)",
           "property": "truncate",
           "input": {
@@ -72,6 +78,7 @@
           "expected": "υγειά"
         },
         {
+          "uuid": "485a6a70-2edb-424d-b999-5529dbc8e002",
           "description": "Maths short",
           "property": "truncate",
           "input": {
@@ -80,6 +87,7 @@
           "expected": "a=πr²"
         },
         {
+          "uuid": "8b4b7b51-8f48-4fbe-964e-6e4e6438be28",
           "description": "Maths long",
           "property": "truncate",
           "input": {
@@ -88,6 +96,7 @@
           "expected": "∅⊊ℕ⊊ℤ"
         },
         {
+          "uuid": "71f4a192-0566-4402-a512-fe12878be523",
           "description": "English and emoji short",
           "property": "truncate",
           "input": {
@@ -96,6 +105,7 @@
           "expected": "Fly 🛫"
         },
         {
+          "uuid": "6f0f71f3-9806-4759-a844-fa182f7bc203",
           "description": "Emoji short",
           "property": "truncate",
           "input": {
@@ -104,6 +114,7 @@
           "expected": "💇"
         },
         {
+          "uuid": "ce71fb92-5214-46d0-a7f8-d5ba56b4cc6e",
           "description": "Emoji long",
           "property": "truncate",
           "input": {
@@ -112,6 +123,7 @@
           "expected": "❄🌡🤧🤒🏥"
         },
         {
+          "uuid": "5dee98d2-d56e-468a-a1f2-121c3f7c5a0b",
           "description": "Royal Flush?",
           "property": "truncate",
           "input": {
@@ -122,4 +134,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/minesweeper/canonical-data.json b/exercises/minesweeper/canonical-data.json
index 0c4f8f38a2..b3ae92546f 100644
--- a/exercises/minesweeper/canonical-data.json
+++ b/exercises/minesweeper/canonical-data.json
@@ -9,6 +9,7 @@
   ],
   "cases": [
     {
+      "uuid": "0c5ec4bd-dea7-4138-8651-1203e1cb9f44",
       "description": "no rows",
       "property": "annotate",
       "input": {
@@ -17,6 +18,7 @@
       "expected": []
     },
     {
+      "uuid": "650ac4c0-ad6b-4b41-acde-e4ea5852c3b8",
       "description": "no columns",
       "property": "annotate",
       "input": {
@@ -25,6 +27,7 @@
       "expected": [""]
     },
     {
+      "uuid": "6fbf8f6d-a03b-42c9-9a58-b489e9235478",
       "description": "no mines",
       "property": "annotate",
       "input": {
@@ -41,6 +44,7 @@
       ]
     },
     {
+      "uuid": "61aff1c4-fb31-4078-acad-cd5f1e635655",
       "description": "minefield with only mines",
       "property": "annotate",
       "input": {
@@ -57,6 +61,7 @@
       ]
     },
     {
+      "uuid": "84167147-c504-4896-85d7-246b01dea7c5",
       "description": "mine surrounded by spaces",
       "property": "annotate",
       "input": {
@@ -73,6 +78,7 @@
       ]
     },
     {
+      "uuid": "cb878f35-43e3-4c9d-93d9-139012cccc4a",
       "description": "space surrounded by mines",
       "property": "annotate",
       "input": {
@@ -89,6 +95,7 @@
       ]
     },
     {
+      "uuid": "7037f483-ddb4-4b35-b005-0d0f4ef4606f",
       "description": "horizontal line",
       "property": "annotate",
       "input": {
@@ -97,6 +104,7 @@
       "expected": ["1*2*1"]
     },
     {
+      "uuid": "e359820f-bb8b-4eda-8762-47b64dba30a6",
       "description": "horizontal line, mines at edges",
       "property": "annotate",
       "input": {
@@ -105,6 +113,7 @@
       "expected": ["*1 1*"]
     },
     {
+      "uuid": "c5198b50-804f-47e9-ae02-c3b42f7ce3ab",
       "description": "vertical line",
       "property": "annotate",
       "input": {
@@ -125,6 +134,7 @@
       ]
     },
     {
+      "uuid": "0c79a64d-703d-4660-9e90-5adfa5408939",
       "description": "vertical line, mines at edges",
       "property": "annotate",
       "input": {
@@ -145,6 +155,7 @@
       ]
     },
     {
+      "uuid": "4b098563-b7f3-401c-97c6-79dd1b708f34",
       "description": "cross",
       "property": "annotate",
       "input": {
@@ -165,6 +176,7 @@
       ]
     },
     {
+      "uuid": "04a260f1-b40a-4e89-839e-8dd8525abe0e",
       "description": "large minefield",
       "property": "annotate",
       "input": {
diff --git a/exercises/nth-prime/canonical-data.json b/exercises/nth-prime/canonical-data.json
index 80546f69a4..8bd88e4777 100644
--- a/exercises/nth-prime/canonical-data.json
+++ b/exercises/nth-prime/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "2.1.0",
   "cases": [
     {
+      "uuid": "75c65189-8aef-471a-81de-0a90c728160c",
       "description": "first prime",
       "property": "prime",
       "input": {
@@ -11,6 +12,7 @@
       "expected": 2
     },
     {
+      "uuid": "2c38804c-295f-4701-b728-56dea34fd1a0",
       "description": "second prime",
       "property": "prime",
       "input": {
@@ -19,6 +21,7 @@
       "expected": 3
     },
     {
+      "uuid": "56692534-781e-4e8c-b1f9-3e82c1640259",
       "description": "sixth prime",
       "property": "prime",
       "input": {
@@ -27,6 +30,7 @@
       "expected": 13
     },
     {
+      "uuid": "fce1e979-0edb-412d-93aa-2c744e8f50ff",
       "description": "big prime",
       "property": "prime",
       "input": {
@@ -35,6 +39,7 @@
       "expected": 104743
     },
     {
+      "uuid": "bd0a9eae-6df7-485b-a144-80e13c7d55b2",
       "description": "there is no zeroth prime",
       "property": "prime",
       "input": {
@@ -45,4 +50,4 @@
       }
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/nucleotide-count/canonical-data.json b/exercises/nucleotide-count/canonical-data.json
index 597ee93ab1..f968652cdb 100644
--- a/exercises/nucleotide-count/canonical-data.json
+++ b/exercises/nucleotide-count/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "count all nucleotides in a strand",
       "cases": [
         {
+          "uuid": "3e5c30a8-87e2-4845-a815-a49671ade970",
           "description": "empty strand",
           "property": "nucleotideCounts",
           "input": {
@@ -19,6 +20,7 @@
           }
         },
         {
+          "uuid": "a0ea42a6-06d9-4ac6-828c-7ccaccf98fec",
           "description": "can count one nucleotide in single-character input",
           "property": "nucleotideCounts",
           "input": {
@@ -32,6 +34,7 @@
           }
         },
         {
+          "uuid": "eca0d565-ed8c-43e7-9033-6cefbf5115b5",
           "description": "strand with repeated nucleotide",
           "property": "nucleotideCounts",
           "input": {
@@ -45,6 +48,7 @@
           }
         },
         {
+          "uuid": "40a45eac-c83f-4740-901a-20b22d15a39f",
           "description": "strand with multiple nucleotides",
           "property": "nucleotideCounts",
           "input": {
@@ -58,6 +62,7 @@
           }
         },
         {
+          "uuid": "b4c47851-ee9e-4b0a-be70-a86e343bd851",
           "description": "strand with invalid nucleotides",
           "property": "nucleotideCounts",
           "input": {
@@ -70,4 +75,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/ocr-numbers/canonical-data.json b/exercises/ocr-numbers/canonical-data.json
index 1c63708125..7991bdc743 100644
--- a/exercises/ocr-numbers/canonical-data.json
+++ b/exercises/ocr-numbers/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "Converts lines of OCR Numbers to a string of integers",
       "cases": [
         {
+          "uuid": "5ee54e1a-b554-4bf3-a056-9a7976c3f7e8",
           "description": "Recognizes 0",
           "property": "convert",
           "input": {
@@ -19,6 +20,7 @@
           "expected": "0"
         },
         {
+          "uuid": "027ada25-17fd-4d78-aee6-35a19623639d",
           "description": "Recognizes 1",
           "property": "convert",
           "input": {
@@ -32,6 +34,7 @@
           "expected": "1"
         },
         {
+          "uuid": "3cce2dbd-01d9-4f94-8fae-419a822e89bb",
           "description": "Unreadable but correctly sized inputs return ?",
           "property": "convert",
           "input": {
@@ -45,6 +48,7 @@
           "expected": "?"
         },
         {
+          "uuid": "cb19b733-4e36-4cf9-a4a1-6e6aac808b9a",
           "description": "Input with a number of lines that is not a multiple of four raises an error",
           "property": "convert",
           "input": {
@@ -57,6 +61,7 @@
           "expected": {"error": "Number of input lines is not a multiple of four"}
         },
         {
+          "uuid": "235f7bd1-991b-4587-98d4-84206eec4cc6",
           "description": "Input with a number of columns that is not a multiple of three raises an error",
           "property": "convert",
           "input": {
@@ -70,6 +75,7 @@
           "expected": {"error": "Number of input columns is not a multiple of three"}
         },
         {
+          "uuid": "4a841794-73c9-4da9-a779-1f9837faff66",
           "description": "Recognizes 110101100",
           "property": "convert",
           "input": {
@@ -83,6 +89,7 @@
           "expected": "110101100"
         },
         {
+          "uuid": "70c338f9-85b1-4296-a3a8-122901cdfde8",
           "description": "Garbled numbers in a string are replaced with ?",
           "property": "convert",
           "input": {
@@ -96,6 +103,7 @@
           "expected": "11?10?1?0"
         },
         {
+          "uuid": "ea494ff4-3610-44d7-ab7e-72fdef0e0802",
           "description": "Recognizes 2",
           "property": "convert",
           "input": {
@@ -109,6 +117,7 @@
           "expected": "2"
         },
         {
+          "uuid": "1acd2c00-412b-4268-93c2-bd7ff8e05a2c",
           "description": "Recognizes 3",
           "property": "convert",
           "input": {
@@ -122,6 +131,7 @@
           "expected": "3"
         },
         {
+          "uuid": "eaec6a15-be17-4b6d-b895-596fae5d1329",
           "description": "Recognizes 4",
           "property": "convert",
           "input": {
@@ -135,6 +145,7 @@
           "expected": "4"
         },
         {
+          "uuid": "440f397a-f046-4243-a6ca-81ab5406c56e",
           "description": "Recognizes 5",
           "property": "convert",
           "input": {
@@ -148,6 +159,7 @@
           "expected": "5"
         },
         {
+          "uuid": "f4c9cf6a-f1e2-4878-bfc3-9b85b657caa0",
           "description": "Recognizes 6",
           "property": "convert",
           "input": {
@@ -161,6 +173,7 @@
           "expected": "6"
         },
         {
+          "uuid": "e24ebf80-c611-41bb-a25a-ac2c0f232df5",
           "description": "Recognizes 7",
           "property": "convert",
           "input": {
@@ -174,6 +187,7 @@
           "expected": "7"
         },
         {
+          "uuid": "b79cad4f-e264-4818-9d9e-77766792e233",
           "description": "Recognizes 8",
           "property": "convert",
           "input": {
@@ -187,6 +201,7 @@
           "expected": "8"
         },
         {
+          "uuid": "5efc9cfc-9227-4688-b77d-845049299e66",
           "description": "Recognizes 9",
           "property": "convert",
           "input": {
@@ -200,6 +215,7 @@
           "expected": "9"
         },
         {
+          "uuid": "f60cb04a-42be-494e-a535-3451c8e097a4",
           "description": "Recognizes string of decimal numbers",
           "property": "convert",
           "input": {
@@ -213,6 +229,7 @@
           "expected": "1234567890"
         },
         {
+          "uuid": "b73ecf8b-4423-4b36-860d-3710bdb8a491",
           "description": "Numbers separated by empty lines are recognized. Lines are joined by commas.",
           "property": "convert",
           "input": {
diff --git a/exercises/palindrome-products/canonical-data.json b/exercises/palindrome-products/canonical-data.json
index 4a96e5712b..5ee3a2d74e 100644
--- a/exercises/palindrome-products/canonical-data.json
+++ b/exercises/palindrome-products/canonical-data.json
@@ -2,6 +2,7 @@
     "exercise": "palindrome-products",
     "version": "1.2.0",
     "cases": [{
+            "uuid": "5cff78fe-cf02-459d-85c2-ce584679f887",
             "description": "finds the smallest palindrome from single digit factors",
             "property": "smallest",
             "input": {
@@ -16,6 +17,7 @@
             }
         },
         {
+            "uuid": "0853f82c-5fc4-44ae-be38-fadb2cced92d",
             "description": "finds the largest palindrome from single digit factors",
             "property": "largest",
             "input": {
@@ -31,6 +33,7 @@
             }
         },
         {
+            "uuid": "66c3b496-bdec-4103-9129-3fcb5a9063e1",
             "description": "find the smallest palindrome from double digit factors",
             "property": "smallest",
             "input": {
@@ -45,6 +48,7 @@
             }
         },
         {
+            "uuid": "a10682ae-530a-4e56-b89d-69664feafe53",
             "description": "find the largest palindrome from double digit factors",
             "property": "largest",
             "input": {
@@ -59,6 +63,7 @@
             }
         },
         {
+            "uuid": "cecb5a35-46d1-4666-9719-fa2c3af7499d",
             "description": "find smallest palindrome from triple digit factors",
             "property": "smallest",
             "input": {
@@ -73,6 +78,7 @@
             }
         },
         {
+            "uuid": "edab43e1-c35f-4ea3-8c55-2f31dddd92e5",
             "description": "find the largest palindrome from triple digit factors",
             "property": "largest",
             "input": {
@@ -87,6 +93,7 @@
             }
         },
         {
+            "uuid": "4f802b5a-9d74-4026-a70f-b53ff9234e4e",
             "description": "find smallest palindrome from four digit factors",
             "property": "smallest",
             "input": {
@@ -101,6 +108,7 @@
             }
         },
         {
+            "uuid": "787525e0-a5f9-40f3-8cb2-23b52cf5d0be",
             "description": "find the largest palindrome from four digit factors",
             "property": "largest",
             "input": {
@@ -115,6 +123,7 @@
             }
         },
         {
+            "uuid": "58fb1d63-fddb-4409-ab84-a7a8e58d9ea0",
             "description": "empty result for smallest if no palindrome in the range",
             "property": "smallest",
             "input": {
@@ -127,6 +136,7 @@
             }
         },
         {
+            "uuid": "9de9e9da-f1d9-49a5-8bfc-3d322efbdd02",
             "description": "empty result for largest if no palindrome in the range",
             "property": "largest",
             "input": {
@@ -139,6 +149,7 @@
             }
         },
         {
+            "uuid": "12e73aac-d7ee-4877-b8aa-2aa3dcdb9f8a",
             "description": "error result for smallest if min is more than max",
             "property": "smallest",
             "input": {
@@ -150,6 +161,7 @@
             }
         },
         {
+            "uuid": "eeeb5bff-3f47-4b1e-892f-05829277bd74",
             "description": "error result for largest if min is more than max",
             "property": "largest",
             "input": {
@@ -161,4 +173,4 @@
             }
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/exercises/pangram/canonical-data.json b/exercises/pangram/canonical-data.json
index d940ebd103..8d6d0fb084 100644
--- a/exercises/pangram/canonical-data.json
+++ b/exercises/pangram/canonical-data.json
@@ -7,6 +7,7 @@
   "version": "2.0.0",
   "cases": [
     {
+      "uuid": "64f61791-508e-4f5c-83ab-05de042b0149",
       "description": "empty sentence",
       "property": "isPangram",
       "input": {
@@ -15,6 +16,7 @@
       "expected": false
     },
     {
+      "uuid": "74858f80-4a4d-478b-8a5e-c6477e4e4e84",
       "description": "perfect lower case",
       "property": "isPangram",
       "input": {
@@ -23,6 +25,7 @@
       "expected": true
     },
     {
+      "uuid": "61288860-35ca-4abe-ba08-f5df76ecbdcd",
       "description": "only lower case",
       "property": "isPangram",
       "input": {
@@ -31,6 +34,7 @@
       "expected": true
     },
     {
+      "uuid": "6564267d-8ac5-4d29-baf2-e7d2e304a743",
       "description": "missing the letter 'x'",
       "property": "isPangram",
       "input": {
@@ -39,6 +43,7 @@
       "expected": false
     },
     {
+      "uuid": "c79af1be-d715-4cdb-a5f2-b2fa3e7e0de0",
       "description": "missing the letter 'h'",
       "property": "isPangram",
       "input": {
@@ -47,6 +52,7 @@
       "expected": false
     },
     {
+      "uuid": "d835ec38-bc8f-48e4-9e36-eb232427b1df",
       "description": "with underscores",
       "property": "isPangram",
       "input": {
@@ -55,6 +61,7 @@
       "expected": true
     },
     {
+      "uuid": "8cc1e080-a178-4494-b4b3-06982c9be2a8",
       "description": "with numbers",
       "property": "isPangram",
       "input": {
@@ -63,6 +70,7 @@
       "expected": true
     },
     {
+      "uuid": "bed96b1c-ff95-45b8-9731-fdbdcb6ede9a",
       "description": "missing letters replaced by numbers",
       "property": "isPangram",
       "input": {
@@ -71,6 +79,7 @@
       "expected": false
     },
     {
+      "uuid": "938bd5d8-ade5-40e2-a2d9-55a338a01030",
       "description": "mixed case and punctuation",
       "property": "isPangram",
       "input": {
@@ -79,6 +88,7 @@
       "expected": true
     },
     {
+      "uuid": "2577bf54-83c8-402d-a64b-a2c0f7bb213a",
       "description": "case insensitive",
       "property": "isPangram",
       "input": {
diff --git a/exercises/pascals-triangle/canonical-data.json b/exercises/pascals-triangle/canonical-data.json
index 2d9c06e4e5..fece928f9b 100644
--- a/exercises/pascals-triangle/canonical-data.json
+++ b/exercises/pascals-triangle/canonical-data.json
@@ -10,6 +10,7 @@
       "description": "Given a count, return a collection of that many rows of pascal's triangle",
       "cases": [
         {
+          "uuid": "9920ce55-9629-46d5-85d6-4201f4a4234d",
           "description": "zero rows",
           "property": "rows",
           "input": {
@@ -18,6 +19,7 @@
           "expected": []
         },
         {
+          "uuid": "70d643ce-a46d-4e93-af58-12d88dd01f21",
           "description": "single row",
           "property": "rows",
           "input": {
@@ -26,6 +28,7 @@
           "expected": [[1]]
         },
         {
+          "uuid": "a6e5a2a2-fc9a-4b47-9f4f-ed9ad9fbe4bd",
           "description": "two rows",
           "property": "rows",
           "input": {
@@ -34,6 +37,7 @@
           "expected": [[1], [1, 1]]
         },
         {
+          "uuid": "97206a99-79ba-4b04-b1c5-3c0fa1e16925",
           "description": "three rows",
           "property": "rows",
           "input": {
@@ -42,6 +46,7 @@
           "expected": [[1], [1, 1], [1, 2, 1]]
         },
         {
+          "uuid": "565a0431-c797-417c-a2c8-2935e01ce306",
           "description": "four rows",
           "property": "rows",
           "input": {
@@ -50,6 +55,7 @@
           "expected": [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1]]
         },
         {
+          "uuid": "06f9ea50-9f51-4eb2-b9a9-c00975686c27",
           "description": "five rows",
           "property": "rows",
           "input": {
@@ -58,6 +64,7 @@
           "expected": [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]
         },
         {
+          "uuid": "c3912965-ddb4-46a9-848e-3363e6b00b13",
           "description": "six rows",
           "property": "rows",
           "input": {
@@ -66,6 +73,7 @@
           "expected": [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1], [1, 5, 10, 10, 5, 1]]
         },
         {
+          "uuid": "6cb26c66-7b57-4161-962c-81ec8c99f16b",
           "description": "ten rows",
           "property": "rows",
           "input": {
diff --git a/exercises/perfect-numbers/canonical-data.json b/exercises/perfect-numbers/canonical-data.json
index 95ab0b81c9..91f03817a8 100644
--- a/exercises/perfect-numbers/canonical-data.json
+++ b/exercises/perfect-numbers/canonical-data.json
@@ -6,6 +6,7 @@
             "description": "Perfect numbers",
             "cases": [
                 {
+                    "uuid": "163e8e86-7bfd-4ee2-bd68-d083dc3381a3",
                     "description": "Smallest perfect number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -14,6 +15,7 @@
                     "expected": "perfect"
                 },
                 {
+                    "uuid": "169a7854-0431-4ae0-9815-c3b6d967436d",
                     "description": "Medium perfect number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -22,6 +24,7 @@
                     "expected": "perfect"
                 },
                 {
+                    "uuid": "ee3627c4-7b36-4245-ba7c-8727d585f402",
                     "description": "Large perfect number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -35,6 +38,7 @@
             "description": "Abundant numbers",
             "cases": [
                 {
+                    "uuid": "80ef7cf8-9ea8-49b9-8b2d-d9cb3db3ed7e",
                     "description": "Smallest abundant number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -43,6 +47,7 @@
                     "expected": "abundant"
                 },
                 {
+                    "uuid": "3e300e0d-1a12-4f11-8c48-d1027165ab60",
                     "description": "Medium abundant number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -51,6 +56,7 @@
                     "expected": "abundant"
                 },
                 {
+                    "uuid": "ec7792e6-8786-449c-b005-ce6dd89a772b",
                     "description": "Large abundant number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -64,6 +70,7 @@
             "description": "Deficient numbers",
             "cases": [
                 {
+                    "uuid": "e610fdc7-2b6e-43c3-a51c-b70fb37413ba",
                     "description": "Smallest prime deficient number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -72,6 +79,7 @@
                     "expected": "deficient"
                 },
                 {
+                    "uuid": "0beb7f66-753a-443f-8075-ad7fbd9018f3",
                     "description": "Smallest non-prime deficient number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -80,6 +88,7 @@
                     "expected": "deficient"
                 },
                 {
+                    "uuid": "1c802e45-b4c6-4962-93d7-1cad245821ef",
                     "description": "Medium deficient number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -88,6 +97,7 @@
                     "expected": "deficient"
                 },
                 {
+                    "uuid": "47dd569f-9e5a-4a11-9a47-a4e91c8c28aa",
                     "description": "Large deficient number is classified correctly",
                     "property": "classify",
                     "input": {
@@ -96,6 +106,7 @@
                     "expected": "deficient"
                 },
                 {
+                    "uuid": "a696dec8-6147-4d68-afad-d38de5476a56",
                     "description": "Edge case (no factors other than itself) is classified correctly",
                     "property": "classify",
                     "input": {
@@ -109,6 +120,7 @@
             "description": "Invalid inputs",
             "cases": [
                 {
+                    "uuid": "72445cee-660c-4d75-8506-6c40089dc302",
                     "description": "Zero is rejected (not a natural number)",
                     "property": "classify",
                     "input": {
@@ -119,6 +131,7 @@
                     }
                 },
                 {
+                    "uuid": "2d72ce2c-6802-49ac-8ece-c790ba3dae13",
                     "description": "Negative integer is rejected (not a natural number)",
                     "property": "classify",
                     "input": {
@@ -131,4 +144,4 @@
             ]
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/exercises/phone-number/canonical-data.json b/exercises/phone-number/canonical-data.json
index 155d2589a6..01a6eb4f2a 100644
--- a/exercises/phone-number/canonical-data.json
+++ b/exercises/phone-number/canonical-data.json
@@ -11,6 +11,7 @@
       ],
       "cases": [
         {
+          "uuid": "79666dce-e0f1-46de-95a1-563802913c35",
           "description": "cleans the number",
           "property": "clean",
           "input": {
@@ -19,6 +20,7 @@
           "expected": "2234567890"
         },
         {
+          "uuid": "c360451f-549f-43e4-8aba-fdf6cb0bf83f",
           "description": "cleans numbers with dots",
           "property": "clean",
           "input": {
@@ -27,6 +29,7 @@
           "expected": "2234567890"
         },
         {
+          "uuid": "08f94c34-9a37-46a2-a123-2a8e9727395d",
           "description": "cleans numbers with multiple spaces",
           "property": "clean",
           "input": {
@@ -35,6 +38,7 @@
           "expected": "2234567890"
         },
         {
+          "uuid": "598d8432-0659-4019-a78b-1c6a73691d21",
           "description": "invalid when 9 digits",
           "property": "clean",
           "input": {
@@ -43,6 +47,7 @@
           "expected": {"error": "incorrect number of digits"}
         },
         {
+          "uuid": "57061c72-07b5-431f-9766-d97da7c4399d",
           "description": "invalid when 11 digits does not start with a 1",
           "property": "clean",
           "input": {
@@ -51,6 +56,7 @@
           "expected": {"error": "11 digits must start with 1"}
         },
         {
+          "uuid": "9962cbf3-97bb-4118-ba9b-38ff49c64430",
           "description": "valid when 11 digits and starting with 1",
           "property": "clean",
           "input": {
@@ -59,6 +65,7 @@
           "expected": "2234567890"
         },
         {
+          "uuid": "fa724fbf-054c-4d91-95da-f65ab5b6dbca",
           "description": "valid when 11 digits and starting with 1 even with punctuation",
           "property": "clean",
           "input": {
@@ -67,6 +74,7 @@
           "expected": "2234567890"
         },
         {
+          "uuid": "c6a5f007-895a-4fc5-90bc-a7e70f9b5cad",
           "description": "invalid when more than 11 digits",
           "property": "clean",
           "input": {
@@ -75,6 +83,7 @@
           "expected": {"error": "more than 11 digits"}
         },
         {
+          "uuid": "63f38f37-53f6-4a5f-bd86-e9b404f10a60",
           "description": "invalid with letters",
           "property": "clean",
           "input": {
@@ -83,6 +92,7 @@
           "expected": {"error": "letters not permitted"}
         },
         {
+          "uuid": "4bd97d90-52fd-45d3-b0db-06ab95b1244e",
           "description": "invalid with punctuations",
           "property": "clean",
           "input": {
@@ -91,6 +101,7 @@
           "expected": {"error": "punctuations not permitted"}
         },
         {
+          "uuid": "d77d07f8-873c-4b17-8978-5f66139bf7d7",
           "description": "invalid if area code starts with 0",
           "property": "clean",
           "input": {
@@ -99,6 +110,7 @@
           "expected": {"error": "area code cannot start with zero"}
         },
         {
+          "uuid": "c7485cfb-1e7b-4081-8e96-8cdb3b77f15e",
           "description": "invalid if area code starts with 1",
           "property": "clean",
           "input": {
@@ -107,6 +119,7 @@
           "expected": {"error": "area code cannot start with one"}
         },
         {
+          "uuid": "4d622293-6976-413d-b8bf-dd8a94d4e2ac",
           "description": "invalid if exchange code starts with 0",
           "property": "clean",
           "input": {
@@ -115,6 +128,7 @@
           "expected": {"error": "exchange code cannot start with zero"}
         },
         {
+          "uuid": "4cef57b4-7d8e-43aa-8328-1e1b89001262",
           "description": "invalid if exchange code starts with 1",
           "property": "clean",
           "input": {
@@ -123,6 +137,7 @@
           "expected": {"error": "exchange code cannot start with one"}
         },
         {
+          "uuid": "9925b09c-1a0d-4960-a197-5d163cbe308c",
           "description": "invalid if area code starts with 0 on valid 11-digit number",
           "property": "clean",
           "input": {
@@ -131,6 +146,7 @@
           "expected": {"error": "area code cannot start with zero"}
         },
         {
+          "uuid": "3f809d37-40f3-44b5-ad90-535838b1a816",
           "description": "invalid if area code starts with 1 on valid 11-digit number",
           "property": "clean",
           "input": {
@@ -139,6 +155,7 @@
           "expected": {"error": "area code cannot start with one"}
         },
         {
+          "uuid": "e08e5532-d621-40d4-b0cc-96c159276b65",
           "description": "invalid if exchange code starts with 0 on valid 11-digit number",
           "property": "clean",
           "input": {
@@ -147,6 +164,7 @@
           "expected": {"error": "exchange code cannot start with zero"}
         },
         {
+          "uuid": "57b32f3d-696a-455c-8bf1-137b6d171cdf",
           "description": "invalid if exchange code starts with 1 on valid 11-digit number",
           "property": "clean",
           "input": {
diff --git a/exercises/pig-latin/canonical-data.json b/exercises/pig-latin/canonical-data.json
index 4ec929fd93..e988f34de8 100644
--- a/exercises/pig-latin/canonical-data.json
+++ b/exercises/pig-latin/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "ay is added to words that start with vowels",
       "cases": [
         {
+          "uuid": "11567f84-e8c6-4918-aedb-435f0b73db57",
           "description": "word beginning with a",
           "property": "translate",
           "input": {
@@ -14,6 +15,7 @@
           "expected": "appleay"
         },
         {
+          "uuid": "f623f581-bc59-4f45-9032-90c3ca9d2d90",
           "description": "word beginning with e",
           "property": "translate",
           "input": {
@@ -22,6 +24,7 @@
           "expected": "earay"
         },
         {
+          "uuid": "7dcb08b3-23a6-4e8a-b9aa-d4e859450d58",
           "description": "word beginning with i",
           "property": "translate",
           "input": {
@@ -30,6 +33,7 @@
           "expected": "iglooay"
         },
         {
+          "uuid": "0e5c3bff-266d-41c8-909f-364e4d16e09c",
           "description": "word beginning with o",
           "property": "translate",
           "input": {
@@ -38,6 +42,7 @@
           "expected": "objectay"
         },
         {
+          "uuid": "614ba363-ca3c-4e96-ab09-c7320799723c",
           "description": "word beginning with u",
           "property": "translate",
           "input": {
@@ -46,6 +51,7 @@
           "expected": "underay"
         },
         {
+          "uuid": "bf2538c6-69eb-4fa7-a494-5a3fec911326",
           "description": "word beginning with a vowel and followed by a qu",
           "property": "translate",
           "input": {
@@ -59,6 +65,7 @@
       "description": "first letter and ay are moved to the end of words that start with consonants",
       "cases": [
         {
+          "uuid": "e5be8a01-2d8a-45eb-abb4-3fcc9582a303",
           "description": "word beginning with p",
           "property": "translate",
           "input": {
@@ -67,6 +74,7 @@
           "expected": "igpay"
         },
         {
+          "uuid": "d36d1e13-a7ed-464d-a282-8820cb2261ce",
           "description": "word beginning with k",
           "property": "translate",
           "input": {
@@ -75,6 +83,7 @@
           "expected": "oalakay"
         },
         {
+          "uuid": "d838b56f-0a89-4c90-b326-f16ff4e1dddc",
           "description": "word beginning with x",
           "property": "translate",
           "input": {
@@ -83,6 +92,7 @@
           "expected": "enonxay"
         },
         {
+          "uuid": "bce94a7a-a94e-4e2b-80f4-b2bb02e40f71",
           "description": "word beginning with q without a following u",
           "property": "translate",
           "input": {
@@ -96,6 +106,7 @@
       "description": "some letter clusters are treated like a single consonant",
       "cases": [
         {
+          "uuid": "c01e049a-e3e2-451c-bf8e-e2abb7e438b8",
           "description": "word beginning with ch",
           "property": "translate",
           "input": {
@@ -104,6 +115,7 @@
           "expected": "airchay"
         },
         {
+          "uuid": "9ba1669e-c43f-4b93-837a-cfc731fd1425",
           "description": "word beginning with qu",
           "property": "translate",
           "input": {
@@ -112,6 +124,7 @@
           "expected": "eenquay"
         },
         {
+          "uuid": "92e82277-d5e4-43d7-8dd3-3a3b316c41f7",
           "description": "word beginning with qu and a preceding consonant",
           "property": "translate",
           "input": {
@@ -120,6 +133,7 @@
           "expected": "aresquay"
         },
         {
+          "uuid": "79ae4248-3499-4d5b-af46-5cb05fa073ac",
           "description": "word beginning with th",
           "property": "translate",
           "input": {
@@ -128,6 +142,7 @@
           "expected": "erapythay"
         },
         {
+          "uuid": "e0b3ae65-f508-4de3-8999-19c2f8e243e1",
           "description": "word beginning with thr",
           "property": "translate",
           "input": {
@@ -136,6 +151,7 @@
           "expected": "ushthray"
         },
         {
+          "uuid": "20bc19f9-5a35-4341-9d69-1627d6ee6b43",
           "description": "word beginning with sch",
           "property": "translate",
           "input": {
@@ -149,6 +165,7 @@
       "description": "some letter clusters are treated like a single vowel",
       "cases": [
         {
+          "uuid": "54b796cb-613d-4509-8c82-8fbf8fc0af9e",
           "description": "word beginning with yt",
           "property": "translate",
           "input": {
@@ -157,6 +174,7 @@
           "expected": "yttriaay"
         },
         {
+          "uuid": "8c37c5e1-872e-4630-ba6e-d20a959b67f6",
           "description": "word beginning with xr",
           "property": "translate",
           "input": {
@@ -170,6 +188,7 @@
       "description": "position of y in a word determines if it is a consonant or a vowel",
       "cases": [
         {
+          "uuid": "a4a36d33-96f3-422c-a233-d4021460ff00",
           "description": "y is treated like a consonant at the beginning of a word",
           "property": "translate",
           "input": {
@@ -178,6 +197,7 @@
           "expected": "ellowyay"
         },
         {
+          "uuid": "adc90017-1a12-4100-b595-e346105042c7",
           "description": "y is treated like a vowel at the end of a consonant cluster",
           "property": "translate",
           "input": {
@@ -186,6 +206,7 @@
           "expected": "ythmrhay"
         },
         {
+          "uuid": "29b4ca3d-efe5-4a95-9a54-8467f2e5e59a",
           "description": "y as second letter in two letter word",
           "property": "translate",
           "input": {
@@ -199,6 +220,7 @@
       "description": "phrases are translated",
       "cases": [
         {
+          "uuid": "44616581-5ce3-4a81-82d0-40c7ab13d2cf",
           "description": "a whole phrase",
           "property": "translate",
           "input": {
@@ -209,4 +231,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/poker/canonical-data.json b/exercises/poker/canonical-data.json
index d67a931185..6bf8244c1c 100644
--- a/exercises/poker/canonical-data.json
+++ b/exercises/poker/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "161f485e-39c2-4012-84cf-bec0c755b66c",
       "description": "single hand always wins",
       "property": "bestHands",
       "input": {
@@ -15,6 +16,7 @@
       ]
     },
     {
+      "uuid": "370ac23a-a00f-48a9-9965-6f3fb595cf45",
       "description": "highest card out of all hands wins",
       "property": "bestHands",
       "input": {
@@ -29,6 +31,7 @@
       ]
     },
     {
+      "uuid": "d94ad5a7-17df-484b-9932-c64fc26cff52",
       "description": "a tie has multiple winners",
       "property": "bestHands",
       "input": {
@@ -45,6 +48,7 @@
       ]
     },
     {
+      "uuid": "61ed83a9-cfaa-40a5-942a-51f52f0a8725",
       "description": "multiple hands with the same high cards, tie compares next highest ranked, down to last card",
       "property": "bestHands",
       "input": {
@@ -58,6 +62,7 @@
       ]
     },
     {
+      "uuid": "f7175a89-34ff-44de-b3d7-f6fd97d1fca4",
       "description": "one pair beats high card",
       "property": "bestHands",
       "input": {
@@ -71,6 +76,7 @@
       ]
     },
     {
+      "uuid": "e114fd41-a301-4111-a9e7-5a7f72a76561",
       "description": "highest pair wins",
       "property": "bestHands",
       "input": {
@@ -84,6 +90,7 @@
       ]
     },
     {
+      "uuid": "935bb4dc-a622-4400-97fa-86e7d06b1f76",
       "description": "two pairs beats one pair",
       "property": "bestHands",
       "input": {
@@ -97,6 +104,7 @@
       ]
     },
     {
+      "uuid": "c8aeafe1-6e3d-4711-a6de-5161deca91fd",
       "description": "both hands have two pairs, highest ranked pair wins",
       "property": "bestHands",
       "input": {
@@ -110,6 +118,7 @@
       ]
     },
     {
+      "uuid": "88abe1ba-7ad7-40f3-847e-0a26f8e46a60",
       "description": "both hands have two pairs, with the same highest ranked pair, tie goes to low pair",
       "property": "bestHands",
       "input": {
@@ -123,6 +132,7 @@
       ]
     },
     {
+      "uuid": "15a7a315-0577-47a3-9981-d6cf8e6f387b",
       "description": "both hands have two identically ranked pairs, tie goes to remaining card (kicker)",
       "property": "bestHands",
       "input": {
@@ -136,6 +146,7 @@
       ]
     },
     {
+      "uuid": "21e9f1e6-2d72-49a1-a930-228e5e0195dc",
       "description": "three of a kind beats two pair",
       "property": "bestHands",
       "input": {
@@ -149,6 +160,7 @@
       ]
     },
     {
+      "uuid": "c2fffd1f-c287-480f-bf2d-9628e63bbcc3",
       "description": "both hands have three of a kind, tie goes to highest ranked triplet",
       "property": "bestHands",
       "input": {
@@ -162,6 +174,7 @@
       ]
     },
     {
+      "uuid": "eb856cc2-481c-4b0d-9835-4d75d07a5d9d",
       "description": "with multiple decks, two players can have same three of a kind, ties go to highest remaining cards",
       "property": "bestHands",
       "input": {
@@ -175,6 +188,7 @@
       ]
     },
     {
+      "uuid": "a858c5d9-2f28-48e7-9980-b7fa04060a60",
       "description": "a straight beats three of a kind",
       "property": "bestHands",
       "input": {
@@ -188,6 +202,7 @@
       ]
     },
     {
+      "uuid": "73c9c756-e63e-4b01-a88d-0d4491a7a0e3",
       "description": "aces can end a straight (10 J Q K A)",
       "property": "bestHands",
       "input": {
@@ -201,6 +216,7 @@
       ]
     },
     {
+      "uuid": "76856b0d-35cd-49ce-a492-fe5db53abc02",
       "description": "aces can start a straight (A 2 3 4 5)",
       "property": "bestHands",
       "input": {
@@ -214,6 +230,7 @@
       ]
     },
     {
+      "uuid": "6980c612-bbff-4914-b17a-b044e4e69ea1",
       "description": "both hands with a straight, tie goes to highest ranked card",
       "property": "bestHands",
       "input": {
@@ -227,6 +244,7 @@
       ]
     },
     {
+      "uuid": "5135675c-c2fc-4e21-9ba3-af77a32e9ba4",
       "description": "even though an ace is usually high, a 5-high straight is the lowest-scoring straight",
       "property": "bestHands",
       "input": {
@@ -240,6 +258,7 @@
       ]
     },
     {
+      "uuid": "c601b5e6-e1df-4ade-b444-b60ce13b2571",
       "description": "flush beats a straight",
       "property": "bestHands",
       "input": {
@@ -253,6 +272,7 @@
       ]
     },
     {
+      "uuid": "4d90261d-251c-49bd-a468-896bf10133de",
       "description": "both hands have a flush, tie goes to high card, down to the last one if necessary",
       "property": "bestHands",
       "input": {
@@ -266,6 +286,7 @@
       ]
     },
     {
+      "uuid": "3a19361d-8974-455c-82e5-f7152f5dba7c",
       "description": "full house beats a flush",
       "property": "bestHands",
       "input": {
@@ -279,6 +300,7 @@
       ]
     },
     {
+      "uuid": "eb73d0e6-b66c-4f0f-b8ba-bf96bc0a67f0",
       "description": "both hands have a full house, tie goes to highest-ranked triplet",
       "property": "bestHands",
       "input": {
@@ -292,6 +314,7 @@
       ]
     },
     {
+      "uuid": "34b51168-1e43-4c0d-9b32-e356159b4d5d",
       "description": "with multiple decks, both hands have a full house with the same triplet, tie goes to the pair",
       "property": "bestHands",
       "input": {
@@ -305,6 +328,7 @@
       ]
     },
     {
+      "uuid": "d61e9e99-883b-4f99-b021-18f0ae50c5f4",
       "description": "four of a kind beats a full house",
       "property": "bestHands",
       "input": {
@@ -318,6 +342,7 @@
       ]
     },
     {
+      "uuid": "2e1c8c63-e0cb-4214-a01b-91954490d2fe",
       "description": "both hands have four of a kind, tie goes to high quad",
       "property": "bestHands",
       "input": {
@@ -331,6 +356,7 @@
       ]
     },
     {
+      "uuid": "892ca75d-5474-495d-9f64-a6ce2dcdb7e1",
       "description": "with multiple decks, both hands with identical four of a kind, tie determined by kicker" ,
       "property": "bestHands",
       "input": {
@@ -344,6 +370,7 @@
       ]
     },
     {
+      "uuid": "923bd910-dc7b-4f7d-a330-8b42ec10a3ac",
       "description": "straight flush beats four of a kind",
       "property": "bestHands",
       "input": {
@@ -357,6 +384,7 @@
       ]
     },
     {
+      "uuid": "d0927f70-5aec-43db-aed8-1cbd1b6ee9ad",
       "description": "both hands have straight flush, tie goes to highest-ranked card",
       "property": "bestHands",
       "input": {
@@ -370,4 +398,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/pov/canonical-data.json b/exercises/pov/canonical-data.json
index be39ef04e1..eb311fdf97 100644
--- a/exercises/pov/canonical-data.json
+++ b/exercises/pov/canonical-data.json
@@ -18,6 +18,7 @@
       ],
       "cases": [
         {
+          "uuid": "1b3cd134-49ad-4a7d-8376-7087b7e70792",
           "description": "Results in the same tree if the input tree is a singleton",
           "property": "fromPov",
           "input": {
@@ -31,6 +32,7 @@
           }
         },
         {
+          "uuid": "0778c745-0636-40de-9edd-25a8f40426f6",
           "description": "Can reroot a tree with a parent and one sibling",
           "property": "fromPov",
           "input": {
@@ -62,6 +64,7 @@
           }
         },
         {
+          "uuid": "fdfdef0a-4472-4248-8bcf-19cf33f9c06e",
           "description": "Can reroot a tree with a parent and many siblings",
           "property": "fromPov",
           "input": {
@@ -105,6 +108,7 @@
           }
         },
         {
+          "uuid": "cbcf52db-8667-43d8-a766-5d80cb41b4bb",
           "description": "Can reroot a tree with new root deeply nested in tree",
           "property": "fromPov",
           "input": {
@@ -158,6 +162,7 @@
           }
         },
         {
+          "uuid": "e27fa4fa-648d-44cd-90af-d64a13d95e06",
           "description": "Moves children of the new root to same level as former parent",
           "property": "fromPov",
           "input": {
@@ -195,6 +200,7 @@
           }
         },
         {
+          "uuid": "09236c7f-7c83-42cc-87a1-25afa60454a3",
           "description": "Can reroot a complex tree with cousins",
           "property": "fromPov",
           "input": {
@@ -278,6 +284,7 @@
           }
         },
         {
+          "uuid": "f41d5eeb-8973-448f-a3b0-cc1e019a4193",
           "description": "Errors if target does not exist in a singleton tree",
           "property": "fromPov",
           "input": {
@@ -289,6 +296,7 @@
           "expected": null
         },
         {
+          "uuid": "9dc0a8b3-df02-4267-9a41-693b6aff75e7",
           "description": "Errors if target does not exist in a large tree",
           "property": "fromPov",
           "input": {
@@ -329,6 +337,7 @@
       ],
       "cases": [
         {
+          "uuid": "02d1f1d9-428d-4395-b026-2db35ffa8f0a",
           "description": "Can find path to parent",
           "property": "pathTo",
           "input": {
@@ -352,6 +361,7 @@
           ]
         },
         {
+          "uuid": "d0002674-fcfb-4cdc-9efa-bfc54e3c31b5",
           "description": "Can find path to sibling",
           "property": "pathTo",
           "input": {
@@ -382,6 +392,7 @@
           ]
         },
         {
+          "uuid": "c9877cd1-0a69-40d4-b362-725763a5c38f",
           "description": "Can find path to cousin",
           "property": "pathTo",
           "input": {
@@ -435,6 +446,7 @@
           ]
         },
         {
+          "uuid": "9fb17a82-2c14-4261-baa3-2f3f234ffa03",
           "description": "Can find path not involving root",
           "property": "pathTo",
           "input": {
@@ -467,6 +479,7 @@
           ]
         },
         {
+          "uuid": "5124ed49-7845-46ad-bc32-97d5ac7451b2",
           "description": "Can find path from nodes other than x",
           "property": "pathTo",
           "input": {
@@ -497,6 +510,7 @@
           ]
         },
         {
+          "uuid": "f52a183c-25cc-4c87-9fc9-0e7f81a5725c",
           "description": "Errors if destination does not exist",
           "property": "pathTo",
           "input": {
@@ -528,6 +542,7 @@
           "expected": null
         },
         {
+          "uuid": "f4fe18b9-b4a2-4bd5-a694-e179155c2149",
           "description": "Errors if source does not exist",
           "property": "pathTo",
           "input": {
@@ -561,4 +576,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/prime-factors/canonical-data.json b/exercises/prime-factors/canonical-data.json
index d7123f5f58..d72d89e2ce 100644
--- a/exercises/prime-factors/canonical-data.json
+++ b/exercises/prime-factors/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "returns prime factors for the given input number",
       "cases": [
         {
+          "uuid": "924fc966-a8f5-4288-82f2-6b9224819ccd",
           "description": "no factors",
           "property": "factors",
           "input": {
@@ -14,6 +15,7 @@
           "expected": []
         },
         {
+          "uuid": "17e30670-b105-4305-af53-ddde182cb6ad",
           "description": "prime number",
           "property": "factors",
           "input": {
@@ -22,6 +24,7 @@
           "expected": [2]
         },
         {
+          "uuid": "f59b8350-a180-495a-8fb1-1712fbee1158",
           "description": "square of a prime",
           "property": "factors",
           "input": {
@@ -30,6 +33,7 @@
           "expected": [3, 3]
         },
         {
+          "uuid": "bc8c113f-9580-4516-8669-c5fc29512ceb",
           "description": "cube of a prime",
           "property": "factors",
           "input": {
@@ -38,6 +42,7 @@
           "expected": [2, 2, 2]
         },
         {
+          "uuid": "00485cd3-a3fe-4fbe-a64a-a4308fc1f870",
           "description": "product of primes and non-primes",
           "property": "factors",
           "input": {
@@ -46,6 +51,7 @@
           "expected": [2, 2, 3]
         },
         {
+          "uuid": "02251d54-3ca1-4a9b-85e1-b38f4b0ccb91",
           "description": "product of primes",
           "property": "factors",
           "input": {
@@ -54,6 +60,7 @@
           "expected": [5, 17, 23, 461]
         },
         {
+          "uuid": "070cf8dc-e202-4285-aa37-8d775c9cd473",
           "description": "factors include a large prime",
           "property": "factors",
           "input": {
diff --git a/exercises/protein-translation/canonical-data.json b/exercises/protein-translation/canonical-data.json
index 3f7c81930d..5c45a4292b 100644
--- a/exercises/protein-translation/canonical-data.json
+++ b/exercises/protein-translation/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "Translate input RNA sequences into proteins",
       "cases": [
         {
+          "uuid": "96d3d44f-34a2-4db4-84cd-fff523e069be",
           "description": "Methionine RNA sequence",
           "property": "proteins",
           "input": {
@@ -14,6 +15,7 @@
           "expected": ["Methionine"]
         },
         {
+          "uuid": "1b4c56d8-d69f-44eb-be0e-7b17546143d9",
           "description": "Phenylalanine RNA sequence 1",
           "property": "proteins",
           "input": {
@@ -22,6 +24,7 @@
           "expected": ["Phenylalanine"]
         },
         {
+          "uuid": "81b53646-bd57-4732-b2cb-6b1880e36d11",
           "description": "Phenylalanine RNA sequence 2",
           "property": "proteins",
           "input": {
@@ -30,6 +33,7 @@
           "expected": ["Phenylalanine"]
         },
         {
+          "uuid": "42f69d4f-19d2-4d2c-a8b0-f0ae9ee1b6b4",
           "description": "Leucine RNA sequence 1",
           "property": "proteins",
           "input": {
@@ -38,6 +42,7 @@
           "expected": ["Leucine"]
         },
         {
+          "uuid": "ac5edadd-08ed-40a3-b2b9-d82bb50424c4",
           "description": "Leucine RNA sequence 2",
           "property": "proteins",
           "input": {
@@ -46,6 +51,7 @@
           "expected": ["Leucine"]
         },
         {
+          "uuid": "8bc36e22-f984-44c3-9f6b-ee5d4e73f120",
           "description": "Serine RNA sequence 1",
           "property": "proteins",
           "input": {
@@ -54,6 +60,7 @@
           "expected": ["Serine"]
         },
         {
+          "uuid": "5c3fa5da-4268-44e5-9f4b-f016ccf90131",
           "description": "Serine RNA sequence 2",
           "property": "proteins",
           "input": {
@@ -62,6 +69,7 @@
           "expected": ["Serine"]
         },
         {
+          "uuid": "00579891-b594-42b4-96dc-7ff8bf519606",
           "description": "Serine RNA sequence 3",
           "property": "proteins",
           "input": {
@@ -70,6 +78,7 @@
           "expected": ["Serine"]
         },
         {
+          "uuid": "08c61c3b-fa34-4950-8c4a-133945570ef6",
           "description": "Serine RNA sequence 4",
           "property": "proteins",
           "input": {
@@ -78,6 +87,7 @@
           "expected": ["Serine"]
         },
         {
+          "uuid": "54e1e7d8-63c0-456d-91d2-062c72f8eef5",
           "description": "Tyrosine RNA sequence 1",
           "property": "proteins",
           "input": {
@@ -86,6 +96,7 @@
           "expected": ["Tyrosine"]
         },
         {
+          "uuid": "47bcfba2-9d72-46ad-bbce-22f7666b7eb1",
           "description": "Tyrosine RNA sequence 2",
           "property": "proteins",
           "input": {
@@ -94,6 +105,7 @@
           "expected": ["Tyrosine"]
         },
         {
+          "uuid": "3a691829-fe72-43a7-8c8e-1bd083163f72",
           "description": "Cysteine RNA sequence 1",
           "property": "proteins",
           "input": {
@@ -102,6 +114,7 @@
           "expected": ["Cysteine"]
         },
         {
+          "uuid": "1b6f8a26-ca2f-43b8-8262-3ee446021767",
           "description": "Cysteine RNA sequence 2",
           "property": "proteins",
           "input": {
@@ -110,6 +123,7 @@
           "expected": ["Cysteine"]
         },
         {
+          "uuid": "1e91c1eb-02c0-48a0-9e35-168ad0cb5f39",
           "description": "Tryptophan RNA sequence",
           "property": "proteins",
           "input": {
@@ -118,6 +132,7 @@
           "expected": ["Tryptophan"]
         },
         {
+          "uuid": "e547af0b-aeab-49c7-9f13-801773a73557",
           "description": "STOP codon RNA sequence 1",
           "property": "proteins",
           "input": {
@@ -126,6 +141,7 @@
           "expected": []
         },
         {
+          "uuid": "67640947-ff02-4f23-a2ef-816f8a2ba72e",
           "description": "STOP codon RNA sequence 2",
           "property": "proteins",
           "input": {
@@ -134,6 +150,7 @@
           "expected": []
         },
         {
+          "uuid": "9c2ad527-ebc9-4ace-808b-2b6447cb54cb",
           "description": "STOP codon RNA sequence 3",
           "property": "proteins",
           "input": {
@@ -142,6 +159,7 @@
           "expected": []
         },
         {
+          "uuid": "d0f295df-fb70-425c-946c-ec2ec185388e",
           "description": "Translate RNA strand into correct protein list",
           "property": "proteins",
           "input": {
@@ -150,6 +168,7 @@
           "expected": ["Methionine","Phenylalanine","Tryptophan"]
         },
         {
+          "uuid": "e30e8505-97ec-4e5f-a73e-5726a1faa1f4",
           "description": "Translation stops if STOP codon at beginning of sequence",
           "property": "proteins",
           "input": {
@@ -158,6 +177,7 @@
           "expected": []
         },
         {
+          "uuid": "5358a20b-6f4c-4893-bce4-f929001710f3",
           "description": "Translation stops if STOP codon at end of two-codon sequence",
           "property": "proteins",
           "input": {
@@ -166,6 +186,7 @@
           "expected": ["Tryptophan"]
         },
         {
+          "uuid": "ba16703a-1a55-482f-bb07-b21eef5093a3",
           "description": "Translation stops if STOP codon at end of three-codon sequence",
           "property": "proteins",
           "input": {
@@ -174,6 +195,7 @@
           "expected": ["Methionine","Phenylalanine"]
         },
         {
+          "uuid": "4089bb5a-d5b4-4e71-b79e-b8d1f14a2911",
           "description": "Translation stops if STOP codon in middle of three-codon sequence",
           "property": "proteins",
           "input": {
@@ -182,6 +204,7 @@
           "expected": ["Tryptophan"]
         },
         {
+          "uuid": "2c2a2a60-401f-4a80-b977-e0715b23b93d",
           "description": "Translation stops if STOP codon in middle of six-codon sequence",
           "property": "proteins",
           "input": {
@@ -192,4 +215,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/proverb/canonical-data.json b/exercises/proverb/canonical-data.json
index f91ded092b..fffc6eddac 100644
--- a/exercises/proverb/canonical-data.json
+++ b/exercises/proverb/canonical-data.json
@@ -8,6 +8,7 @@
     ],
     "cases": [
         {
+            "uuid": "e974b73e-7851-484f-8d6d-92e07fe742fc",
             "description": "zero pieces",
             "property": "recite",
             "input": {
@@ -16,6 +17,7 @@
             "expected": []
         },
         {
+            "uuid": "2fcd5f5e-8b82-4e74-b51d-df28a5e0faa4",
             "description": "one piece",
             "property": "recite",
             "input": {
@@ -28,6 +30,7 @@
             ]
         },
         {
+            "uuid": "d9d0a8a1-d933-46e2-aa94-eecf679f4b0e",
             "description": "two pieces",
             "property": "recite",
             "input": {
@@ -42,6 +45,7 @@
             ]
         },
         {
+            "uuid": "c95ef757-5e94-4f0d-a6cb-d2083f5e5a83",
             "description": "three pieces",
             "property": "recite",
             "input": {
@@ -58,6 +62,7 @@
             ]
         },
         {
+            "uuid": "433fb91c-35a2-4d41-aeab-4de1e82b2126",
             "description": "full proverb",
             "property": "recite",
             "input": {
@@ -82,6 +87,7 @@
             ]
         },
         {
+            "uuid": "c1eefa5a-e8d9-41c7-91d4-99fab6d6b9f7",
             "description": "four pieces modernized",
             "property": "recite",
             "input": {
diff --git a/exercises/pythagorean-triplet/canonical-data.json b/exercises/pythagorean-triplet/canonical-data.json
index 4df2dff3ee..cd1d815601 100644
--- a/exercises/pythagorean-triplet/canonical-data.json
+++ b/exercises/pythagorean-triplet/canonical-data.json
@@ -3,6 +3,7 @@
     "version": "1.0.0",
     "cases": [
         {
+            "uuid": "a19de65d-35b8-4480-b1af-371d9541e706",
             "description": "triplets whose sum is 12",
             "property": "tripletsWithSum",
             "input": {
@@ -13,6 +14,7 @@
             ]
         },
         {
+            "uuid": "48b21332-0a3d-43b2-9a52-90b2a6e5c9f5",
             "description": "triplets whose sum is 108",
             "property": "tripletsWithSum",
             "input": {
@@ -23,6 +25,7 @@
             ]
         },
         {
+            "uuid": "dffc1266-418e-4daa-81af-54c3e95c3bb5",
             "description": "triplets whose sum is 1000",
             "property": "tripletsWithSum",
             "input": {
@@ -33,6 +36,7 @@
             ]
         },
         {
+            "uuid": "5f86a2d4-6383-4cce-93a5-e4489e79b186",
             "description": "no matching triplets for 1001",
             "property": "tripletsWithSum",
             "input": {
@@ -41,6 +45,7 @@
             "expected": []
         },
         {
+            "uuid": "bf17ba80-1596-409a-bb13-343bdb3b2904",
             "description": "returns all matching triplets",
             "property": "tripletsWithSum",
             "input": {
@@ -52,6 +57,7 @@
             ]
         },
         {
+            "uuid": "9d8fb5d5-6c6f-42df-9f95-d3165963ac57",
             "description": "several matching triplets",
             "property": "tripletsWithSum",
             "input": {
@@ -69,6 +75,7 @@
             ]
         },
         {
+            "uuid": "f5be5734-8aa0-4bd1-99a2-02adcc4402b4",
             "description": "triplets for large number",
             "property": "tripletsWithSum",
             "input": {
@@ -83,4 +90,4 @@
             ]
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/exercises/queen-attack/canonical-data.json b/exercises/queen-attack/canonical-data.json
index ea5605267f..5d71ee790c 100644
--- a/exercises/queen-attack/canonical-data.json
+++ b/exercises/queen-attack/canonical-data.json
@@ -15,6 +15,7 @@
       "description": "Test creation of Queens with valid and invalid positions",
       "cases": [
         {
+          "uuid": "3ac4f735-d36c-44c4-a3e2-316f79704203",
           "description": "queen with a valid position",
           "property": "create",
           "input": {
@@ -28,6 +29,7 @@
           "expected": 0
         },
         {
+          "uuid": "4e812d5d-b974-4e38-9a6b-8e0492bfa7be",
           "description": "queen must have positive row",
           "property": "create",
           "input": {
@@ -41,6 +43,7 @@
           "expected": {"error": "row not positive"}
         },
         {
+          "uuid": "f07b7536-b66b-4f08-beb9-4d70d891d5c8",
           "description": "queen must have row on board",
           "property": "create",
           "input": {
@@ -54,6 +57,7 @@
           "expected": {"error": "row not on board"}
         },
         {
+          "uuid": "15a10794-36d9-4907-ae6b-e5a0d4c54ebe",
           "description": "queen must have positive column",
           "property": "create",
           "input": {
@@ -67,6 +71,7 @@
           "expected": {"error": "column not positive"}
         },
         {
+          "uuid": "6907762d-0e8a-4c38-87fb-12f2f65f0ce4",
           "description": "queen must have column on board",
           "property": "create",
           "input": {
@@ -85,6 +90,7 @@
       "description": "Test the ability of one queen to attack another",
       "cases": [
         {
+          "uuid": "33ae4113-d237-42ee-bac1-e1e699c0c007",
           "description": "can not attack",
           "property": "canAttack",
           "input": {
@@ -104,6 +110,7 @@
           "expected": false
         },
         {
+          "uuid": "eaa65540-ea7c-4152-8c21-003c7a68c914",
           "description": "can attack on same row",
           "property": "canAttack",
           "input": {
@@ -123,6 +130,7 @@
           "expected": true
         },
         {
+          "uuid": "bae6f609-2c0e-4154-af71-af82b7c31cea",
           "description": "can attack on same column",
           "property": "canAttack",
           "input": {
@@ -142,6 +150,7 @@
           "expected": true
         },
         {
+          "uuid": "0e1b4139-b90d-4562-bd58-dfa04f1746c7",
           "description": "can attack on first diagonal",
           "property": "canAttack",
           "input": {
@@ -161,6 +170,7 @@
           "expected": true
         },
         {
+          "uuid": "ff9b7ed4-e4b6-401b-8d16-bc894d6d3dcd",
           "description": "can attack on second diagonal",
           "property": "canAttack",
           "input": {
@@ -180,6 +190,7 @@
           "expected": true
         },
         {
+          "uuid": "0a71e605-6e28-4cc2-aa47-d20a2e71037a",
           "description": "can attack on third diagonal",
           "property": "canAttack",
           "input": {
@@ -199,6 +210,7 @@
           "expected": true
         },
         {
+          "uuid": "0790b588-ae73-4f1f-a968-dd0b34f45f86",
           "description": "can attack on fourth diagonal",
           "property": "canAttack",
           "input": {
diff --git a/exercises/rail-fence-cipher/canonical-data.json b/exercises/rail-fence-cipher/canonical-data.json
index 0d32875abe..4db413ecb9 100644
--- a/exercises/rail-fence-cipher/canonical-data.json
+++ b/exercises/rail-fence-cipher/canonical-data.json
@@ -10,6 +10,7 @@
       "description": "encode",
       "cases": [
         {
+          "uuid": "46dc5c50-5538-401d-93a5-41102680d068",
           "description": "encode with two rails",
           "property": "encode",
           "input": {
@@ -19,6 +20,7 @@
           "expected": "XXXXXXXXXOOOOOOOOO"
         },
         {
+          "uuid": "25691697-fbd8-4278-8c38-b84068b7bc29",
           "description": "encode with three rails",
           "property": "encode",
           "input": {
@@ -28,6 +30,7 @@
           "expected": "WECRLTEERDSOEEFEAOCAIVDEN"
         },
         {
+          "uuid": "384f0fea-1442-4f1a-a7c4-5cbc2044002c",
           "description": "encode with ending in the middle",
           "property": "encode",
           "input": {
@@ -42,6 +45,7 @@
       "description": "decode",
       "cases": [
         {
+          "uuid": "cd525b17-ec34-45ef-8f0e-4f27c24a7127",
           "description": "decode with three rails",
           "property": "decode",
           "input": {
@@ -51,6 +55,7 @@
           "expected": "THEDEVILISINTHEDETAILS"
         },
         {
+          "uuid": "dd7b4a98-1a52-4e5c-9499-cbb117833507",
           "description": "decode with five rails",
           "property": "decode",
           "input": {
@@ -60,6 +65,7 @@
           "expected": "EXERCISMISAWESOME"
         },
         {
+          "uuid": "93e1ecf4-fac9-45d9-9cd2-591f47d3b8d3",
           "description": "decode with six rails",
           "property": "decode",
           "input": {
diff --git a/exercises/raindrops/canonical-data.json b/exercises/raindrops/canonical-data.json
index f41a684459..f90317ac8a 100644
--- a/exercises/raindrops/canonical-data.json
+++ b/exercises/raindrops/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "1575d549-e502-46d4-a8e1-6b7bec6123d8",
       "description": "the sound for 1 is 1",
       "property": "convert",
       "input": {
@@ -11,6 +12,7 @@
       "expected": "1"
     },
     {
+      "uuid": "1f51a9f9-4895-4539-b182-d7b0a5ab2913",
       "description": "the sound for 3 is Pling",
       "property": "convert",
       "input": {
@@ -19,6 +21,7 @@
       "expected": "Pling"
     },
     {
+      "uuid": "2d9bfae5-2b21-4bcd-9629-c8c0e388f3e0",
       "description": "the sound for 5 is Plang",
       "property": "convert",
       "input": {
@@ -27,6 +30,7 @@
       "expected": "Plang"
     },
     {
+      "uuid": "d7e60daa-32ef-4c23-b688-2abff46c4806",
       "description": "the sound for 7 is Plong",
       "property": "convert",
       "input": {
@@ -35,6 +39,7 @@
       "expected": "Plong"
     },
     {
+      "uuid": "6bb4947b-a724-430c-923f-f0dc3d62e56a",
       "description": "the sound for 6 is Pling as it has a factor 3",
       "property": "convert",
       "input": {
@@ -43,6 +48,7 @@
       "expected": "Pling"
     },
     {
+      "uuid": "ce51e0e8-d9d4-446d-9949-96eac4458c2d",
       "description": "2 to the power 3 does not make a raindrop sound as 3 is the exponent not the base",
       "property": "convert",
       "input": {
@@ -51,6 +57,7 @@
       "expected": "8"
     },
     {
+      "uuid": "0dd66175-e3e2-47fc-8750-d01739856671",
       "description": "the sound for 9 is Pling as it has a factor 3",
       "property": "convert",
       "input": {
@@ -59,6 +66,7 @@
       "expected": "Pling"
     },
     {
+      "uuid": "022c44d3-2182-4471-95d7-c575af225c96",
       "description": "the sound for 10 is Plang as it has a factor 5",
       "property": "convert",
       "input": {
@@ -67,6 +75,7 @@
       "expected": "Plang"
     },
     {
+      "uuid": "37ab74db-fed3-40ff-b7b9-04acdfea8edf",
       "description": "the sound for 14 is Plong as it has a factor of 7",
       "property": "convert",
       "input": {
@@ -75,6 +84,7 @@
       "expected": "Plong"
     },
     {
+      "uuid": "31f92999-6afb-40ee-9aa4-6d15e3334d0f",
       "description": "the sound for 15 is PlingPlang as it has factors 3 and 5",
       "property": "convert",
       "input": {
@@ -83,6 +93,7 @@
       "expected": "PlingPlang"
     },
     {
+      "uuid": "ff9bb95d-6361-4602-be2c-653fe5239b54",
       "description": "the sound for 21 is PlingPlong as it has factors 3 and 7",
       "property": "convert",
       "input": {
@@ -91,6 +102,7 @@
       "expected": "PlingPlong"
     },
     {
+      "uuid": "d2e75317-b72e-40ab-8a64-6734a21dece1",
       "description": "the sound for 25 is Plang as it has a factor 5",
       "property": "convert",
       "input": {
@@ -99,6 +111,7 @@
       "expected": "Plang"
     },
     {
+      "uuid": "a09c4c58-c662-4e32-97fe-f1501ef7125c",
       "description": "the sound for 27 is Pling as it has a factor 3",
       "property": "convert",
       "input": {
@@ -107,6 +120,7 @@
       "expected": "Pling"
     },
     {
+      "uuid": "bdf061de-8564-4899-a843-14b48b722789",
       "description": "the sound for 35 is PlangPlong as it has factors 5 and 7",
       "property": "convert",
       "input": {
@@ -115,6 +129,7 @@
       "expected": "PlangPlong"
     },
     {
+      "uuid": "c4680bee-69ba-439d-99b5-70c5fd1a7a83",
       "description": "the sound for 49 is Plong as it has a factor 7",
       "property": "convert",
       "input": {
@@ -123,6 +138,7 @@
       "expected": "Plong"
     },
     {
+      "uuid": "17f2bc9a-b65a-4d23-8ccd-266e8c271444",
       "description": "the sound for 52 is 52",
       "property": "convert",
       "input": {
@@ -131,6 +147,7 @@
       "expected": "52"
     },
     {
+      "uuid": "e46677ed-ff1a-419f-a740-5c713d2830e4",
       "description": "the sound for 105 is PlingPlangPlong as it has factors 3, 5 and 7",
       "property": "convert",
       "input": {
@@ -139,6 +156,7 @@
       "expected": "PlingPlangPlong"
     },
     {
+      "uuid": "13c6837a-0fcd-4b86-a0eb-20572f7deb0b",
       "description": "the sound for 3125 is Plang as it has a factor 5",
       "property": "convert",
       "input": {
diff --git a/exercises/rational-numbers/canonical-data.json b/exercises/rational-numbers/canonical-data.json
index 26eff76b88..641c85b792 100644
--- a/exercises/rational-numbers/canonical-data.json
+++ b/exercises/rational-numbers/canonical-data.json
@@ -17,6 +17,7 @@
           "description": "Addition",
           "cases": [
             {
+              "uuid": "0ba4d988-044c-4ed5-9215-4d0bb8d0ae9f",
               "description": "Add two positive rational numbers",
               "property": "add",
               "input": {
@@ -26,6 +27,7 @@
               "expected": [7, 6]
             },
             {
+              "uuid": "88ebc342-a2ac-4812-a656-7b664f718b6a",
               "description": "Add a positive rational number and a negative rational number",
               "property": "add",
               "input": {
@@ -35,6 +37,7 @@
               "expected": [-1, 6]
             },
             {
+              "uuid": "92ed09c2-991e-4082-a602-13557080205c",
               "description": "Add two negative rational numbers",
               "property": "add",
               "input": {
@@ -44,6 +47,7 @@
               "expected": [-7, 6]
             },
             {
+              "uuid": "6e58999e-3350-45fb-a104-aac7f4a9dd11",
               "description": "Add a rational number to its additive inverse",
               "property": "add",
               "input": {
@@ -58,6 +62,7 @@
           "description": "Subtraction",
           "cases": [
             {
+              "uuid": "47bba350-9db1-4ab9-b412-4a7e1f72a66e",
               "description": "Subtract two positive rational numbers",
               "property": "sub",
               "input": {
@@ -67,6 +72,7 @@
               "expected": [-1, 6]
             },
             {
+              "uuid": "93926e2a-3e82-4aee-98a7-fc33fb328e87",
               "description": "Subtract a positive rational number and a negative rational number",
               "property": "sub",
               "input": {
@@ -76,6 +82,7 @@
               "expected": [7, 6]
             },
             {
+              "uuid": "a965ba45-9b26-442b-bdc7-7728e4b8d4cc",
               "description": "Subtract two negative rational numbers",
               "property": "sub",
               "input": {
@@ -85,6 +92,7 @@
               "expected": [1, 6]
             },
             {
+              "uuid": "0df0e003-f68e-4209-8c6e-6a4e76af5058",
               "description": "Subtract a rational number from itself",
               "property": "sub",
               "input": {
@@ -99,6 +107,7 @@
           "description": "Multiplication",
           "cases": [
             {
+              "uuid": "34fde77a-75f4-4204-8050-8d3a937958d3",
               "description": "Multiply two positive rational numbers",
               "property": "mul",
               "input": {
@@ -108,6 +117,7 @@
               "expected": [1, 3]
             },
             {
+              "uuid": "6d015cf0-0ea3-41f1-93de-0b8e38e88bae",
               "description": "Multiply a negative rational number by a positive rational number",
               "property": "mul",
               "input": {
@@ -117,6 +127,7 @@
               "expected": [-1, 3]
             },
             {
+              "uuid": "d1bf1b55-954e-41b1-8c92-9fc6beeb76fa",
               "description": "Multiply two negative rational numbers",
               "property": "mul",
               "input": {
@@ -126,6 +137,7 @@
               "expected": [1, 3]
             },
             {
+              "uuid": "a9b8f529-9ec7-4c79-a517-19365d779040",
               "description": "Multiply a rational number by its reciprocal",
               "property": "mul",
               "input": {
@@ -135,6 +147,7 @@
               "expected": [1, 1]
             },
             {
+              "uuid": "d89d6429-22fa-4368-ab04-9e01a44d3b48",
               "description": "Multiply a rational number by 1",
               "property": "mul",
               "input": {
@@ -144,6 +157,7 @@
               "expected": [1, 2]
             },
             {
+              "uuid": "0d95c8b9-1482-4ed7-bac9-b8694fa90145",
               "description": "Multiply a rational number by 0",
               "property": "mul",
               "input": {
@@ -158,6 +172,7 @@
           "description": "Division",
           "cases": [
             {
+              "uuid": "1de088f4-64be-4e6e-93fd-5997ae7c9798",
               "description": "Divide two positive rational numbers",
               "property": "div",
               "input": {
@@ -167,6 +182,7 @@
               "expected": [3, 4]
             },
             {
+              "uuid": "7d7983db-652a-4e66-981a-e921fb38d9a9",
               "description": "Divide a positive rational number by a negative rational number",
               "property": "div",
               "input": {
@@ -176,6 +192,7 @@
               "expected": [-3, 4]
             },
             {
+              "uuid": "1b434d1b-5b38-4cee-aaf5-b9495c399e34",
               "description": "Divide two negative rational numbers",
               "property": "div",
               "input": {
@@ -185,6 +202,7 @@
               "expected": [3, 4]
             },
             {
+              "uuid": "d81c2ebf-3612-45a6-b4e0-f0d47812bd59",
               "description": "Divide a rational number by 1",
               "property": "div",
               "input": {
@@ -201,6 +219,7 @@
       "description": "Absolute value",
       "cases": [
         {
+          "uuid": "5fee0d8e-5955-4324-acbe-54cdca94ddaa",
           "description": "Absolute value of a positive rational number",
           "property": "abs",
           "input": {
@@ -209,6 +228,7 @@
           "expected": [1, 2]
         },
         {
+          "uuid": "3cb570b6-c36a-4963-a380-c0834321bcaa",
           "description": "Absolute value of a positive rational number with negative numerator and denominator",
           "property": "abs",
           "input": {
@@ -217,6 +237,7 @@
           "expected": [1, 2]
         },
         {
+          "uuid": "6a05f9a0-1f6b-470b-8ff7-41af81773f25",
           "description": "Absolute value of a negative rational number",
           "property": "abs",
           "input": {
@@ -225,6 +246,7 @@
           "expected": [1, 2]
         },
         {
+          "uuid": "5d0f2336-3694-464f-8df9-f5852fda99dd",
           "description": "Absolute value of a negative rational number with negative denominator",
           "property": "abs",
           "input": {
@@ -233,6 +255,7 @@
           "expected": [1, 2]
         },
         {
+          "uuid": "f8e1ed4b-9dca-47fb-a01e-5311457b3118",
           "description": "Absolute value of zero",
           "property": "abs",
           "input": {
@@ -246,6 +269,7 @@
       "description": "Exponentiation of a rational number",
       "cases": [
         {
+          "uuid": "ea2ad2af-3dab-41e7-bb9f-bd6819668a84",
           "description": "Raise a positive rational number to a positive integer power",
           "property": "exprational",
           "input": {
@@ -255,6 +279,7 @@
           "expected": [1, 8]
         },
         {
+          "uuid": "8168edd2-0af3-45b1-b03f-72c01332e10a",
           "description": "Raise a negative rational number to a positive integer power",
           "property": "exprational",
           "input": {
@@ -264,6 +289,7 @@
           "expected": [-1, 8]
         },
         {
+          "uuid": "e2f25b1d-e4de-4102-abc3-c2bb7c4591e4",
           "description": "Raise zero to an integer power",
           "property": "exprational",
           "input": {
@@ -273,6 +299,7 @@
           "expected": [0, 1]
         },
         {
+          "uuid": "431cac50-ab8b-4d58-8e73-319d5404b762",
           "description": "Raise one to an integer power",
           "property": "exprational",
           "input": {
@@ -282,6 +309,7 @@
           "expected": [1, 1]
         },
         {
+          "uuid": "7d164739-d68a-4a9c-b99f-dd77ce5d55e6",
           "description": "Raise a positive rational number to the power of zero",
           "property": "exprational",
           "input": {
@@ -291,6 +319,7 @@
           "expected": [1, 1]
         },
         {
+          "uuid": "eb6bd5f5-f880-4bcd-8103-e736cb6e41d1",
           "description": "Raise a negative rational number to the power of zero",
           "property": "exprational",
           "input": {
@@ -305,6 +334,7 @@
       "description": "Exponentiation of a real number to a rational number",
       "cases": [
         {
+          "uuid": "30b467dd-c158-46f5-9ffb-c106de2fd6fa",
           "description": "Raise a real number to a positive rational number",
           "property": "expreal",
           "input": {
@@ -314,6 +344,7 @@
           "expected": 16.0
         },
         {
+          "uuid": "6e026bcc-be40-4b7b-ae22-eeaafc5a1789",
           "description": "Raise a real number to a negative rational number",
           "property": "expreal",
           "input": {
@@ -323,6 +354,7 @@
           "expected": 0.3333333333333333
         },
         {
+          "uuid": "9f866da7-e893-407f-8cd2-ee85d496eec5",
           "description": "Raise a real number to a zero rational number",
           "property": "expreal",
           "input": {
@@ -337,6 +369,7 @@
       "description": "Reduction to lowest terms",
       "cases": [
         {
+          "uuid": "0a63fbde-b59c-4c26-8237-1e0c73354d0a",
           "description": "Reduce a positive rational number to lowest terms",
           "property": "reduce",
           "input": {
@@ -345,6 +378,7 @@
           "expected": [1, 2]
         },
         {
+          "uuid": "f87c2a4e-d29c-496e-a193-318c503e4402",
           "description": "Reduce a negative rational number to lowest terms",
           "property": "reduce",
           "input": {
@@ -353,6 +387,7 @@
           "expected": [-2, 3]
         },
         {
+          "uuid": "3b92ffc0-5b70-4a43-8885-8acee79cdaaf",
           "description": "Reduce a rational number with a negative denominator to lowest terms",
           "property": "reduce",
           "input": {
@@ -361,6 +396,7 @@
           "expected": [-1, 3]
         },
         {
+          "uuid": "c9dbd2e6-5ac0-4a41-84c1-48b645b4f663",
           "description": "Reduce zero to lowest terms",
           "property": "reduce",
           "input": {
@@ -369,6 +405,7 @@
           "expected": [0, 1]
         },
         {
+          "uuid": "297b45ad-2054-4874-84d4-0358dc1b8887",
           "description": "Reduce an integer to lowest terms",
           "property": "reduce",
           "input": {
@@ -377,6 +414,7 @@
           "expected": [-2, 1]
         },
         {
+          "uuid": "a73a17fe-fe8c-4a1c-a63b-e7579e333d9e",
           "description": "Reduce one to lowest terms",
           "property": "reduce",
           "input": {
diff --git a/exercises/react/canonical-data.json b/exercises/react/canonical-data.json
index 572405955a..7fb9bfdd8a 100644
--- a/exercises/react/canonical-data.json
+++ b/exercises/react/canonical-data.json
@@ -45,6 +45,7 @@
   ],
   "cases": [
     {
+      "uuid": "c51ee736-d001-4f30-88d1-0c8e8b43cd07",
       "description": "input cells have a value",
       "property": "react",
       "input": {
@@ -66,6 +67,7 @@
       "expected": {}
     },
     {
+      "uuid": "dedf0fe0-da0c-4d5d-a582-ffaf5f4d0851",
       "description": "an input cell's value can be set",
       "property": "react",
       "input": {
@@ -92,6 +94,7 @@
       "expected": {}
     },
     {
+      "uuid": "5854b975-f545-4f93-8968-cc324cde746e",
       "description": "compute cells calculate initial value",
       "property": "react",
       "input": {
@@ -119,6 +122,7 @@
       "expected": {}
     },
     {
+      "uuid": "25795a3d-b86c-4e91-abe7-1c340e71560c",
       "description": "compute cells take inputs in the right order",
       "property": "react",
       "input": {
@@ -151,6 +155,7 @@
       "expected": {}
     },
     {
+      "uuid": "c62689bf-7be5-41bb-b9f8-65178ef3e8ba",
       "description": "compute cells update value when dependencies are changed",
       "property": "react",
       "input": {
@@ -183,6 +188,7 @@
       "expected": {}
     },
     {
+      "uuid": "5ff36b09-0a88-48d4-b7f8-69dcf3feea40",
       "description": "compute cells can depend on other compute cells",
       "property": "react",
       "input": {
@@ -232,6 +238,7 @@
       "expected": {}
     },
     {
+      "uuid": "abe33eaf-68ad-42a5-b728-05519ca88d2d",
       "description": "compute cells fire callbacks",
       "property": "react",
       "input": {
@@ -267,6 +274,7 @@
       "expected": {}
     },
     {
+      "uuid": "9e5cb3a4-78e5-4290-80f8-a78612c52db2",
       "description": "callback cells only fire on change",
       "property": "react",
       "input": {
@@ -308,6 +316,7 @@
       "expected": {}
     },
     {
+      "uuid": "ada17cb6-7332-448a-b934-e3d7495c13d3",
       "description": "callbacks do not report already reported values",
       "property": "react",
       "input": {
@@ -351,6 +360,7 @@
       "expected": {}
     },
     {
+      "uuid": "ac271900-ea5c-461c-9add-eeebcb8c03e5",
       "description": "callbacks can fire from multiple cells",
       "property": "react",
       "input": {
@@ -398,6 +408,7 @@
       "expected": {}
     },
     {
+      "uuid": "95a82dcc-8280-4de3-a4cd-4f19a84e3d6f",
       "description": "callbacks can be added and removed",
       "property": "react",
       "input": {
@@ -459,6 +470,7 @@
       "expected": {}
     },
     {
+      "uuid": "f2a7b445-f783-4e0e-8393-469ab4915f2a",
       "description": "removing a callback multiple times doesn't interfere with other callbacks",
       "comments": [
         "Some incorrect implementations store their callbacks in an array",
@@ -520,6 +532,7 @@
       "expected": {}
     },
     {
+      "uuid": "daf6feca-09e0-4ce5-801d-770ddfe1c268",
       "description": "callbacks should only be called once even if multiple dependencies change",
       "comments": [
         "Some incorrect implementations call a callback function too early,",
@@ -577,6 +590,7 @@
       "expected": {}
     },
     {
+      "uuid": "9a5b159f-b7aa-4729-807e-f1c38a46d377",
       "description": "callbacks should not be called if dependencies change but output value doesn't change",
       "comments": [
         "Some incorrect implementations simply mark a compute cell as dirty when a dependency changes,",
diff --git a/exercises/rectangles/canonical-data.json b/exercises/rectangles/canonical-data.json
index 3c0304b433..86ca4ac614 100644
--- a/exercises/rectangles/canonical-data.json
+++ b/exercises/rectangles/canonical-data.json
@@ -7,6 +7,7 @@
   ],
   "cases": [
     {
+      "uuid": "485b7bab-4150-40aa-a8db-73013427d08c",
       "description": "no rows",
       "property": "rectangles",
       "input": {
@@ -15,6 +16,7 @@
       "expected": 0
     },
     {
+      "uuid": "076929ed-27e8-45dc-b14b-08279944dc49",
       "description": "no columns",
       "property": "rectangles",
       "input": {
@@ -23,6 +25,7 @@
       "expected": 0
     },
     {
+      "uuid": "0a8abbd1-a0a4-4180-aa4e-65c1b1a073fa",
       "description": "no rectangles",
       "property": "rectangles",
       "input": {
@@ -31,6 +34,7 @@
       "expected": 0
     },
     {
+      "uuid": "a4ba42e9-4e7f-4973-b7c7-4ce0760ac6cd",
       "description": "one rectangle",
       "property": "rectangles",
       "input": {
@@ -43,6 +47,7 @@
       "expected": 1
     },
     {
+      "uuid": "ced06550-83da-4d23-98b7-d24152e0db93",
       "description": "two rectangles without shared parts",
       "property": "rectangles",
       "input": {
@@ -57,6 +62,7 @@
       "expected": 2
     },
     {
+      "uuid": "5942d69a-a07c-41c8-8b93-2d13877c706a",
       "description": "five rectangles with shared parts",
       "property": "rectangles",
       "input": {
@@ -71,6 +77,7 @@
       "expected": 5
     },
     {
+      "uuid": "82d70be4-ab37-4bf2-a433-e33778d3bbf1",
       "description": "rectangle of height 1 is counted",
       "property": "rectangles",
       "input": {
@@ -82,6 +89,7 @@
       "expected": 1
     },
     {
+      "uuid": "57f1bc0e-2782-401e-ab12-7c01d8bfc2e0",
       "description": "rectangle of width 1 is counted",
       "property": "rectangles",
       "input": {
@@ -94,6 +102,7 @@
       "expected": 1
     },
     {
+      "uuid": "ef0bb65c-bd80-4561-9535-efc4067054f9",
       "description": "1x1 square is counted",
       "property": "rectangles",
       "input": {
@@ -105,6 +114,7 @@
       "expected": 1
     },
     {
+      "uuid": "e1e1d444-e926-4d30-9bf3-7d8ec9a9e330",
       "description": "only complete rectangles are counted",
       "property": "rectangles",
       "input": {
@@ -119,6 +129,7 @@
       "expected": 1
     },
     {
+      "uuid": "ca021a84-1281-4a56-9b9b-af14113933a4",
       "description": "rectangles can be of different sizes",
       "property": "rectangles",
       "input": {
@@ -133,6 +144,7 @@
       "expected": 3
     },
     {
+      "uuid": "51f689a7-ef3f-41ae-aa2f-5ea09ad897ff",
       "description": "corner is required for a rectangle to be complete",
       "property": "rectangles",
       "input": {
@@ -147,6 +159,7 @@
       "expected": 2
     },
     {
+      "uuid": "d78fe379-8c1b-4d3c-bdf7-29bfb6f6dc66",
       "description": "large input with many rectangles",
       "property": "rectangles",
       "input": {
diff --git a/exercises/resistor-color-duo/canonical-data.json b/exercises/resistor-color-duo/canonical-data.json
index 8eea12e842..8a21f42af7 100644
--- a/exercises/resistor-color-duo/canonical-data.json
+++ b/exercises/resistor-color-duo/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "2.1.0",
   "cases": [
     {
+      "uuid": "ce11995a-5b93-4950-a5e9-93423693b2fc",
       "description": "Brown and black",
       "property": "value",
       "input": {
@@ -11,6 +12,7 @@
       "expected": 10
     },
     {
+      "uuid": "7bf82f7a-af23-48ba-a97d-38d59406a920",
       "description": "Blue and grey",
       "property": "value",
       "input": {
@@ -19,6 +21,7 @@
       "expected": 68
     },
     {
+      "uuid": "f1886361-fdfd-4693-acf8-46726fe24e0c",
       "description": "Yellow and violet",
       "property": "value",
       "input": {
@@ -27,6 +30,7 @@
       "expected": 47
     },
     {
+      "uuid": "77a8293d-2a83-4016-b1af-991acc12b9fe",
       "description": "Orange and orange",
       "property": "value",
       "input": {
@@ -35,6 +39,7 @@
       "expected": 33
     },
     {
+      "uuid": "0c4fb44f-db7c-4d03-afa8-054350f156a8",
       "description": "Ignore additional colors",
       "property": "value",
       "input": {
diff --git a/exercises/resistor-color-trio/canonical-data.json b/exercises/resistor-color-trio/canonical-data.json
index 9b4a60d7a6..c05a71580b 100644
--- a/exercises/resistor-color-trio/canonical-data.json
+++ b/exercises/resistor-color-trio/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "cases": [
     {
+      "uuid": "d6863355-15b7-40bb-abe0-bfb1a25512ed",
       "description": "Orange and orange and black",
       "property": "label",
       "input": {
@@ -14,6 +15,7 @@
       }
     },
     {
+      "uuid": "1224a3a9-8c8e-4032-843a-5224e04647d6",
       "description": "Blue and grey and brown",
       "property": "label",
       "input": {
@@ -25,6 +27,7 @@
       }
     },
     {
+      "uuid": "b8bda7dc-6b95-4539-abb2-2ad51d66a207",
       "description": "Red and black and red",
       "property": "label",
       "input": {
@@ -36,6 +39,7 @@
       }
     },
     {
+      "uuid": "5b1e74bc-d838-4eda-bbb3-eaba988e733b",
       "description": "Green and brown and orange",
       "property": "label",
       "input": {
@@ -47,6 +51,7 @@
       }
     },
     {
+      "uuid": "f5d37ef9-1919-4719-a90d-a33c5a6934c9",
       "description": "Yellow and violet and yellow",
       "property": "label",
       "input": {
diff --git a/exercises/resistor-color/canonical-data.json b/exercises/resistor-color/canonical-data.json
index 1a64c58288..efd74aaaf2 100644
--- a/exercises/resistor-color/canonical-data.json
+++ b/exercises/resistor-color/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "Color codes",
       "cases": [
         {
+          "uuid": "49eb31c5-10a8-4180-9f7f-fea632ab87ef",
           "description": "Black",
           "property": "colorCode",
           "input": {
@@ -14,6 +15,7 @@
           "expected": 0
         },
         {
+          "uuid": "0a4df94b-92da-4579-a907-65040ce0b3fc",
           "description": "White",
           "property": "colorCode",
           "input": {
@@ -22,6 +24,7 @@
           "expected": 9
         },
         {
+          "uuid": "5f81608d-f36f-4190-8084-f45116b6f380",
           "description": "Orange",
           "property": "colorCode",
           "input": {
@@ -32,6 +35,7 @@
       ]
     },
     {
+      "uuid": "581d68fa-f968-4be2-9f9d-880f2fb73cf7",
       "description": "Colors",
       "property": "colors",
       "input": {},
diff --git a/exercises/rest-api/canonical-data.json b/exercises/rest-api/canonical-data.json
index 9dc3224d7d..276c560ab1 100644
--- a/exercises/rest-api/canonical-data.json
+++ b/exercises/rest-api/canonical-data.json
@@ -15,6 +15,7 @@
             "description": "user management",
             "cases": [
                 {
+                    "uuid": "5be01ffb-a814-47a8-a19f-490a5622ba07",
                     "description": "no users",
                     "property": "get",
                     "input": {
@@ -28,6 +29,7 @@
                     }
                 },
                 {
+                    "uuid": "382b70cc-9f6c-486d-9bee-fda2df81c803",
                     "description": "add user",
                     "property": "post",
                     "input": {
@@ -47,6 +49,7 @@
                     }
                 },
                 {
+                    "uuid": "d624e5e5-1abb-4f18-95b3-45d55c818dc3",
                     "description": "get single user",
                     "property": "get",
                     "input": {
@@ -89,6 +92,7 @@
             "description": "iou",
             "cases": [
                 {
+                    "uuid": "7a81b82c-7276-433e-8fce-29ce983a7c56",
                     "description": "both users have 0 balance",
                     "property": "post",
                     "input": {
@@ -137,6 +141,7 @@
                     }
                 },
                 {
+                    "uuid": "1c61f957-cf8c-48ba-9e77-b221ab068803",
                     "description": "borrower has negative balance",
                     "property": "post",
                     "input": {
@@ -196,6 +201,7 @@
                     }
                 },
                 {
+                    "uuid": "8a8567b3-c097-468a-9541-6bb17d5afc85",
                     "description": "lender has negative balance",
                     "property": "post",
                     "input": {
@@ -256,6 +262,7 @@
                     }
                 },
                 {
+                    "uuid": "29fb7c12-7099-4a85-a7c4-9c290d2dc01a",
                     "description": "lender owes borrower",
                     "property": "post",
                     "input": {
@@ -308,6 +315,7 @@
                     }
                 },
                 {
+                    "uuid": "ce969e70-163c-4135-a4a6-2c3a5da286f5",
                     "description": "lender owes borrower less than new loan",
                     "property": "post",
                     "input": {
@@ -360,6 +368,7 @@
                     }
                 },
                 {
+                    "uuid": "7f4aafd9-ae9b-4e15-a406-87a87bdf47a4",
                     "description": "lender owes borrower same as new loan",
                     "property": "post",
                     "input": {
@@ -410,4 +419,4 @@
             ]
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/exercises/reverse-string/canonical-data.json b/exercises/reverse-string/canonical-data.json
index 6d56d59152..d7c567aecb 100644
--- a/exercises/reverse-string/canonical-data.json
+++ b/exercises/reverse-string/canonical-data.json
@@ -6,6 +6,7 @@
       ],
   "cases": [
     {
+      "uuid": "c3b7d806-dced-49ee-8543-933fd1719b1c",
       "description": "an empty string",
       "property": "reverse",
       "input": {
@@ -14,6 +15,7 @@
       "expected": ""
     },
     {
+      "uuid": "01ebf55b-bebb-414e-9dec-06f7bb0bee3c",
       "description": "a word",
       "property": "reverse",
       "input": {
@@ -22,6 +24,7 @@
       "expected": "tobor"
     },
     {
+      "uuid": "0f7c07e4-efd1-4aaa-a07a-90b49ce0b746",
       "description": "a capitalized word",
       "property": "reverse",
       "input": {
@@ -30,6 +33,7 @@
       "expected": "nemaR"
     },
     {
+      "uuid": "71854b9c-f200-4469-9f5c-1e8e5eff5614",
       "description": "a sentence with punctuation",
       "property": "reverse",
       "input": {
@@ -38,6 +42,7 @@
       "expected": "!yrgnuh m'I"
     },
     {
+      "uuid": "1f8ed2f3-56f3-459b-8f3e-6d8d654a1f6c",
       "description": "a palindrome",
       "property": "reverse",
       "input": {
@@ -46,6 +51,7 @@
       "expected": "racecar"
     },
     {
+      "uuid": "b9e7dec1-c6df-40bd-9fa3-cd7ded010c4c",
       "description": "an even-sized word",
       "property": "reverse",
       "input": {
diff --git a/exercises/rna-transcription/canonical-data.json b/exercises/rna-transcription/canonical-data.json
index d946cd31d5..74e24e07c8 100644
--- a/exercises/rna-transcription/canonical-data.json
+++ b/exercises/rna-transcription/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.3.0",
   "cases": [
     {
+      "uuid": "b4631f82-c98c-4a2f-90b3-c5c2b6c6f661",
       "description": "Empty RNA sequence",
       "property": "toRna",
       "input": {
@@ -11,6 +12,7 @@
       "expected": ""
     },
     {
+      "uuid": "a9558a3c-318c-4240-9256-5d5ed47005a6",
       "description": "RNA complement of cytosine is guanine",
       "property": "toRna",
       "input": {
@@ -19,6 +21,7 @@
       "expected": "G"
     },
     {
+      "uuid": "6eedbb5c-12cb-4c8b-9f51-f8320b4dc2e7",
       "description": "RNA complement of guanine is cytosine",
       "property": "toRna",
       "input": {
@@ -27,6 +30,7 @@
       "expected": "C"
     },
     {
+      "uuid": "870bd3ec-8487-471d-8d9a-a25046488d3e",
       "description": "RNA complement of thymine is adenine",
       "property": "toRna",
       "input": {
@@ -35,6 +39,7 @@
       "expected": "A"
     },
     {
+      "uuid": "aade8964-02e1-4073-872f-42d3ffd74c5f",
       "description": "RNA complement of adenine is uracil",
       "property": "toRna",
       "input": {
@@ -43,6 +48,7 @@
       "expected": "U"
     },
     {
+      "uuid": "79ed2757-f018-4f47-a1d7-34a559392dbf",
       "description": "RNA complement",
       "property": "toRna",
       "input": {
diff --git a/exercises/robot-simulator/canonical-data.json b/exercises/robot-simulator/canonical-data.json
index fdbce2d1c2..3abc575daa 100644
--- a/exercises/robot-simulator/canonical-data.json
+++ b/exercises/robot-simulator/canonical-data.json
@@ -13,6 +13,7 @@
       "description": "Create robot",
       "cases": [
         {
+          "uuid": "c557c16d-26c1-4e06-827c-f6602cd0785c",
           "description": "at origin facing north",
           "property": "create",
           "input": {
@@ -31,6 +32,7 @@
           }
         },
         {
+          "uuid": "bf0dffce-f11c-4cdb-8a5e-2c89d8a5a67d",
           "description": "at negative position facing south",
           "property": "create",
           "input": {
@@ -54,6 +56,7 @@
       "description": "Rotating clockwise",
       "cases": [
         {
+          "uuid": "8cbd0086-6392-4680-b9b9-73cf491e67e5",
           "description": "changes north to east",
           "property": "move",
           "input": {
@@ -73,6 +76,7 @@
           }
         },
         {
+          "uuid": "8abc87fc-eab2-4276-93b7-9c009e866ba1",
           "description": "changes east to south",
           "property": "move",
           "input": {
@@ -92,6 +96,7 @@
           }
         },
         {
+          "uuid": "3cfe1b85-bbf2-4bae-b54d-d73e7e93617a",
           "description": "changes south to west",
           "property": "move",
           "input": {
@@ -111,6 +116,7 @@
           }
         },
         {
+          "uuid": "5ea9fb99-3f2c-47bd-86f7-46b7d8c3c716",
           "description": "changes west to north",
           "property": "move",
           "input": {
@@ -135,6 +141,7 @@
       "description": "Rotating counter-clockwise",
       "cases": [
         {
+          "uuid": "fa0c40f5-6ba3-443d-a4b3-58cbd6cb8d63",
           "description": "changes north to west",
           "property": "move",
           "input": {
@@ -154,6 +161,7 @@
           }
         },
         {
+          "uuid": "da33d734-831f-445c-9907-d66d7d2a92e2",
           "description": "changes west to south",
           "property": "move",
           "input": {
@@ -173,6 +181,7 @@
           }
         },
         {
+          "uuid": "bd1ca4b9-4548-45f4-b32e-900fc7c19389",
           "description": "changes south to east",
           "property": "move",
           "input": {
@@ -192,6 +201,7 @@
           }
         },
         {
+          "uuid": "2de27b67-a25c-4b59-9883-bc03b1b55bba",
           "description": "changes east to north",
           "property": "move",
           "input": {
@@ -216,6 +226,7 @@
       "description": "Moving forward one",
       "cases": [
         {
+          "uuid": "f0dc2388-cddc-4f83-9bed-bcf46b8fc7b8",
           "description": "facing north increments Y",
           "property": "move",
           "input": {
@@ -235,6 +246,7 @@
           }
         },
         {
+          "uuid": "2786cf80-5bbf-44b0-9503-a89a9c5789da",
           "description": "facing south decrements Y",
           "property": "move",
           "input": {
@@ -254,6 +266,7 @@
           }
         },
         {
+          "uuid": "84bf3c8c-241f-434d-883d-69817dbd6a48",
           "description": "facing east increments X",
           "property": "move",
           "input": {
@@ -273,6 +286,7 @@
           }
         },
         {
+          "uuid": "bb69c4a7-3bbf-4f64-b415-666fa72d7b04",
           "description": "facing west decrements X",
           "property": "move",
           "input": {
@@ -300,6 +314,7 @@
       ],
       "cases": [
         {
+          "uuid": "e34ac672-4ed4-4be3-a0b8-d9af259cbaa1",
           "description": "moving east and north from README",
           "property": "move",
           "input": {
@@ -319,6 +334,7 @@
           }
         },
         {
+          "uuid": "f30e4955-4b47-4aa3-8b39-ae98cfbd515b",
           "description": "moving west and north",
           "property": "move",
           "input": {
@@ -338,6 +354,7 @@
           }
         },
         {
+          "uuid": "3e466bf6-20ab-4d79-8b51-264165182fca",
           "description": "moving west and south",
           "property": "move",
           "input": {
@@ -357,6 +374,7 @@
           }
         },
         {
+          "uuid": "41f0bb96-c617-4e6b-acff-a4b279d44514",
           "description": "moving east and north",
           "property": "move",
           "input": {
diff --git a/exercises/roman-numerals/canonical-data.json b/exercises/roman-numerals/canonical-data.json
index 115636da0e..d5e4486444 100644
--- a/exercises/roman-numerals/canonical-data.json
+++ b/exercises/roman-numerals/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.2.0",
   "cases": [
     {
+      "uuid": "19828a3a-fbf7-4661-8ddd-cbaeee0e2178",
       "description": "1 is a single I",
       "property": "roman",
       "input": {
@@ -11,6 +12,7 @@
       "expected": "I"
     },
     {
+      "uuid": "f088f064-2d35-4476-9a41-f576da3f7b03",
       "description": "2 is two I's",
       "property": "roman",
       "input": {
@@ -19,6 +21,7 @@
       "expected": "II"
     },
     {
+      "uuid": "b374a79c-3bea-43e6-8db8-1286f79c7106",
       "description": "3 is three I's",
       "property": "roman",
       "input": {
@@ -27,6 +30,7 @@
       "expected": "III"
     },
     {
+      "uuid": "05a0a1d4-a140-4db1-82e8-fcc21fdb49bb",
       "description": "4, being 5 - 1, is IV",
       "property": "roman",
       "input": {
@@ -35,6 +39,7 @@
       "expected": "IV"
     },
     {
+      "uuid": "57c0f9ad-5024-46ab-975d-de18c430b290",
       "description": "5 is a single V",
       "property": "roman",
       "input": {
@@ -43,6 +48,7 @@
       "expected": "V"
     },
     {
+      "uuid": "20a2b47f-e57f-4797-a541-0b3825d7f249",
       "description": "6, being 5 + 1, is VI",
       "property": "roman",
       "input": {
@@ -51,6 +57,7 @@
       "expected": "VI"
     },
     {
+      "uuid": "ff3fb08c-4917-4aab-9f4e-d663491d083d",
       "description": "9, being 10 - 1, is IX",
       "property": "roman",
       "input": {
@@ -59,6 +66,7 @@
       "expected": "IX"
     },
     {
+      "uuid": "2bda64ca-7d28-4c56-b08d-16ce65716cf6",
       "description": "20 is two X's",
       "property": "roman",
       "input": {
@@ -67,6 +75,7 @@
       "expected": "XXVII"
     },
     {
+      "uuid": "a1f812ef-84da-4e02-b4f0-89c907d0962c",
       "description": "48 is not 50 - 2 but rather 40 + 8",
       "property": "roman",
       "input": {
@@ -75,6 +84,7 @@
       "expected": "XLVIII"
     },
     {
+      "uuid": "607ead62-23d6-4c11-a396-ef821e2e5f75",
       "description": "49 is not 40 + 5 + 4 but rather 50 - 10 + 10 - 1",
       "property": "roman",
       "input": {
@@ -83,6 +93,7 @@
       "expected": "XLIX"
     },
     {
+      "uuid": "d5b283d4-455d-4e68-aacf-add6c4b51915",
       "description": "50 is a single L",
       "property": "roman",
       "input": {
@@ -91,6 +102,7 @@
       "expected": "LIX"
     },
     {
+      "uuid": "46b46e5b-24da-4180-bfe2-2ef30b39d0d0",
       "description": "90, being 100 - 10, is XC",
       "property": "roman",
       "input": {
@@ -99,6 +111,7 @@
       "expected": "XCIII"
     },
     {
+      "uuid": "30494be1-9afb-4f84-9d71-db9df18b55e3",
       "description": "100 is a single C",
       "property": "roman",
       "input": {
@@ -107,6 +120,7 @@
       "expected": "CXLI"
     },
     {
+      "uuid": "267f0207-3c55-459a-b81d-67cec7a46ed9",
       "description": "60, being 50 + 10, is LX",
       "property": "roman",
       "input": {
@@ -115,6 +129,7 @@
       "expected": "CLXIII"
     },
     {
+      "uuid": "cdb06885-4485-4d71-8bfb-c9d0f496b404",
       "description": "400, being 500 - 100, is CD",
       "property": "roman",
       "input": {
@@ -123,6 +138,7 @@
       "expected": "CDII"
     },
     {
+      "uuid": "6b71841d-13b2-46b4-ba97-dec28133ea80",
       "description": "500 is a single D",
       "property": "roman",
       "input": {
@@ -131,6 +147,7 @@
       "expected": "DLXXV"
     },
     {
+      "uuid": "432de891-7fd6-4748-a7f6-156082eeca2f",
       "description": "900, being 1000 - 100, is CM",
       "property": "roman",
       "input": {
@@ -139,6 +156,7 @@
       "expected": "CMXI"
     },
     {
+      "uuid": "e6de6d24-f668-41c0-88d7-889c0254d173",
       "description": "1000 is a single M",
       "property": "roman",
       "input": {
@@ -147,6 +165,7 @@
       "expected": "MXXIV"
     },
     {
+      "uuid": "bb550038-d4eb-4be2-a9ce-f21961ac3bc6",
       "description": "3000 is three M's",
       "property": "roman",
       "input": {
diff --git a/exercises/rotational-cipher/canonical-data.json b/exercises/rotational-cipher/canonical-data.json
index eae5c1a6fc..2a627d75b8 100644
--- a/exercises/rotational-cipher/canonical-data.json
+++ b/exercises/rotational-cipher/canonical-data.json
@@ -9,6 +9,7 @@
       "description": "Test rotation from English to ROTn",
       "cases": [
         {
+          "uuid": "74e58a38-e484-43f1-9466-877a7515e10f",
           "description": "rotate a by 0, same output as input",
           "property": "rotate",
           "input": {
@@ -18,6 +19,7 @@
           "expected": "a"
         },
         {
+          "uuid": "7ee352c6-e6b0-4930-b903-d09943ecb8f5",
           "description": "rotate a by 1",
           "property": "rotate",
           "input": {
@@ -27,6 +29,7 @@
           "expected": "b"
         },
         {
+          "uuid": "edf0a733-4231-4594-a5ee-46a4009ad764",
           "description": "rotate a by 26, same output as input",
           "property": "rotate",
           "input": {
@@ -36,6 +39,7 @@
           "expected": "a"
         },
         {
+          "uuid": "e3e82cb9-2a5b-403f-9931-e43213879300",
           "description": "rotate m by 13",
           "property": "rotate",
           "input": {
@@ -45,6 +49,7 @@
           "expected": "z"
         },
         {
+          "uuid": "19f9eb78-e2ad-4da4-8fe3-9291d47c1709",
           "description": "rotate n by 13 with wrap around alphabet",
           "property": "rotate",
           "input": {
@@ -54,6 +59,7 @@
           "expected": "a"
         },
         {
+          "uuid": "a116aef4-225b-4da9-884f-e8023ca6408a",
           "description": "rotate capital letters",
           "property": "rotate",
           "input": {
@@ -63,6 +69,7 @@
           "expected": "TRL"
         },
         {
+          "uuid": "71b541bb-819c-4dc6-a9c3-132ef9bb737b",
           "description": "rotate spaces",
           "property": "rotate",
           "input": {
@@ -72,6 +79,7 @@
           "expected": "T R L"
         },
         {
+          "uuid": "ef32601d-e9ef-4b29-b2b5-8971392282e6",
           "description": "rotate numbers",
           "property": "rotate",
           "input": {
@@ -81,6 +89,7 @@
           "expected": "Xiwxmrk 1 2 3 xiwxmrk"
         },
         {
+          "uuid": "32dd74f6-db2b-41a6-b02c-82eb4f93e549",
           "description": "rotate punctuation",
           "property": "rotate",
           "input": {
@@ -90,6 +99,7 @@
           "expected": "Gzo'n zvo, Bmviyhv!"
         },
         {
+          "uuid": "9fb93fe6-42b0-46e6-9ec1-0bf0a062d8c9",
           "description": "rotate all letters",
           "property": "rotate",
           "input": {
@@ -101,4 +111,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/run-length-encoding/canonical-data.json b/exercises/run-length-encoding/canonical-data.json
index ac82810474..f4cae8d5e8 100644
--- a/exercises/run-length-encoding/canonical-data.json
+++ b/exercises/run-length-encoding/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "run-length encode a string",
       "cases": [
         {
+          "uuid": "ad53b61b-6ffc-422f-81a6-61f7df92a231",
           "description": "empty string",
           "property": "encode",
           "input": {
@@ -14,6 +15,7 @@
           "expected": ""
         },
         {
+          "uuid": "52012823-b7e6-4277-893c-5b96d42f82de",
           "description": "single characters only are encoded without count",
           "property": "encode",
           "input": {
@@ -22,6 +24,7 @@
           "expected": "XYZ"
         },
         {
+          "uuid": "b7868492-7e3a-415f-8da3-d88f51f80409",
           "description": "string with no single characters",
           "property": "encode",
           "input": {
@@ -30,6 +33,7 @@
           "expected": "2A3B4C"
         },
         {
+          "uuid": "859b822b-6e9f-44d6-9c46-6091ee6ae358",
           "description": "single characters mixed with repeated characters",
           "property": "encode",
           "input": {
@@ -38,6 +42,7 @@
           "expected": "12WB12W3B24WB"
         },
         {
+          "uuid": "1b34de62-e152-47be-bc88-469746df63b3",
           "description": "multiple whitespace mixed in string",
           "property": "encode",
           "input": {
@@ -46,6 +51,7 @@
           "expected": "2 hs2q q2w2 "
         },
         {
+          "uuid": "abf176e2-3fbd-40ad-bb2f-2dd6d4df721a",
           "description": "lowercase characters",
           "property": "encode",
           "input": {
@@ -59,6 +65,7 @@
       "description": "run-length decode a string",
       "cases": [
         {
+          "uuid": "7ec5c390-f03c-4acf-ac29-5f65861cdeb5",
           "description": "empty string",
           "property": "decode",
           "input": {
@@ -67,6 +74,7 @@
           "expected": ""
         },
         {
+          "uuid": "ad23f455-1ac2-4b0e-87d0-b85b10696098",
           "description": "single characters only",
           "property": "decode",
           "input": {
@@ -75,6 +83,7 @@
           "expected": "XYZ"
         },
         {
+          "uuid": "21e37583-5a20-4a0e-826c-3dee2c375f54",
           "description": "string with no single characters",
           "property": "decode",
           "input": {
@@ -83,6 +92,7 @@
           "expected": "AABBBCCCC"
         },
         {
+          "uuid": "1389ad09-c3a8-4813-9324-99363fba429c",
           "description": "single characters with repeated characters",
           "property": "decode",
           "input": {
@@ -91,6 +101,7 @@
           "expected": "WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWB"
         },
         {
+          "uuid": "3f8e3c51-6aca-4670-b86c-a213bf4706b0",
           "description": "multiple whitespace mixed in string",
           "property": "decode",
           "input": {
@@ -99,6 +110,7 @@
           "expected": "  hsqq qww  "
         },
         {
+          "uuid": "29f721de-9aad-435f-ba37-7662df4fb551",
           "description": "lower case string",
           "property": "decode",
           "input": {
@@ -112,6 +124,7 @@
       "description": "encode and then decode",
       "cases": [
         {
+          "uuid": "2a762efd-8695-4e04-b0d6-9736899fbc16",
           "description": "encode followed by decode gives original string",
           "property": "consistency",
           "input": {
diff --git a/exercises/saddle-points/canonical-data.json b/exercises/saddle-points/canonical-data.json
index 40655befe8..3f38a030cc 100644
--- a/exercises/saddle-points/canonical-data.json
+++ b/exercises/saddle-points/canonical-data.json
@@ -6,6 +6,7 @@
   ],
   "cases": [
     {
+      "uuid": "3e374e63-a2e0-4530-a39a-d53c560382bd",
       "description": "Can identify single saddle point",
       "comments": [
         "This is the README example."
@@ -26,6 +27,7 @@
       ]
     },
     {
+      "uuid": "6b501e2b-6c1f-491f-b1bb-7f278f760534",
       "description": "Can identify that empty matrix has no saddle points",
       "property": "saddlePoints",
       "input": {
@@ -36,6 +38,7 @@
       "expected": []
     },
     {
+      "uuid": "8c27cc64-e573-4fcb-a099-f0ae863fb02f",
       "description": "Can identify lack of saddle points when there are none",
       "property": "saddlePoints",
       "input": {
@@ -48,6 +51,7 @@
       "expected": []
     },
     {
+      "uuid": "6d1399bd-e105-40fd-a2c9-c6609507d7a3",
       "description": "Can identify multiple saddle points in a column",
       "property": "saddlePoints",
       "input": {
@@ -73,6 +77,7 @@
       ]
     },
     {
+      "uuid": "3e81dce9-53b3-44e6-bf26-e328885fd5d1",
       "description": "Can identify multiple saddle points in a row",
       "property": "saddlePoints",
       "input": {
@@ -98,6 +103,7 @@
       ]
     },
     {
+      "uuid": "88868621-b6f4-4837-bb8b-3fad8b25d46b",
       "description": "Can identify saddle point in bottom right corner",
       "comments": [
         "This is a permutation of the README matrix designed to test",
@@ -119,6 +125,7 @@
       ]
     },
     {
+      "uuid": "5b9499ca-fcea-4195-830a-9c4584a0ee79",
       "description": "Can identify saddle points in a non square matrix",
       "property": "saddlePoints",
       "input": {
@@ -139,6 +146,7 @@
       ]
     },
     {
+      "uuid": "ee99ccd2-a1f1-4283-ad39-f8c70f0cf594",
       "description": "Can identify that saddle points in a single column matrix are those with the minimum value",
       "property": "saddlePoints",
       "input": {
@@ -161,6 +169,7 @@
       ]
     },
     {
+      "uuid": "63abf709-a84b-407f-a1b3-456638689713",
       "description": "Can identify that saddle points in a single row matrix are those with the maximum value",
       "property": "saddlePoints",
       "input": {
diff --git a/exercises/satellite/canonical-data.json b/exercises/satellite/canonical-data.json
index 556b6fc6d2..99a823e3cb 100644
--- a/exercises/satellite/canonical-data.json
+++ b/exercises/satellite/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "2.0.0",
   "cases": [
     {
+      "uuid": "8df3fa26-811a-4165-9286-ff9ac0850d19",
       "description": "Empty tree",
       "property": "treeFromTraversals",
       "input": {
@@ -12,6 +13,7 @@
       "expected": {}
     },
     {
+      "uuid": "f945ccfc-05e3-47d7-825b-0270559d43ad",
       "description": "Tree with one item",
       "property": "treeFromTraversals",
       "input": {
@@ -21,6 +23,7 @@
       "expected": {"v": "a", "l": {}, "r": {}}
     },
     {
+      "uuid": "a0121d5f-37b0-48dd-9c64-cba4c4464135",
       "description": "Tree with many items",
       "property": "treeFromTraversals",
       "input": {
@@ -36,6 +39,7 @@
       }
     },
     {
+      "uuid": "6074041f-4891-4d81-a128-401050c2a3b0",
       "description": "Reject traversals of different length",
       "property": "treeFromTraversals",
       "input": {
@@ -45,6 +49,7 @@
       "expected": {"error": "traversals must have the same length"}
     },
     {
+      "uuid": "27916ce4-45f3-4d8b-8528-496fedc157ca",
       "description": "Reject inconsistent traversals of same length",
       "property": "treeFromTraversals",
       "input": {
@@ -54,6 +59,7 @@
       "expected": {"error": "traversals must have the same elements"}
     },
     {
+      "uuid": "d86a3d72-76a9-43b5-9d3a-e64cb1216035",
       "description": "Reject traversals with repeated items",
       "property": "treeFromTraversals",
       "input": {
diff --git a/exercises/say/canonical-data.json b/exercises/say/canonical-data.json
index 0f46c30cda..bef29d889d 100644
--- a/exercises/say/canonical-data.json
+++ b/exercises/say/canonical-data.json
@@ -7,6 +7,7 @@
   ],
   "cases": [
     {
+      "uuid": "5d22a120-ba0c-428c-bd25-8682235d83e8",
       "description": "zero",
       "property": "say",
       "input": {
@@ -15,6 +16,7 @@
       "expected": "zero"
     },
     {
+      "uuid": "9b5eed77-dbf6-439d-b920-3f7eb58928f6",
       "description": "one",
       "property": "say",
       "input": {
@@ -23,6 +25,7 @@
       "expected": "one"
     },
     {
+      "uuid": "7c499be1-612e-4096-a5e1-43b2f719406d",
       "description": "fourteen",
       "property": "say",
       "input": {
@@ -31,6 +34,7 @@
       "expected": "fourteen"
     },
     {
+      "uuid": "f541dd8e-f070-4329-92b4-b7ce2fcf06b4",
       "description": "twenty",
       "property": "say",
       "input": {
@@ -39,6 +43,7 @@
       "expected": "twenty"
     },
     {
+      "uuid": "d78601eb-4a84-4bfa-bf0e-665aeb8abe94",
       "description": "twenty-two",
       "property": "say",
       "input": {
@@ -47,6 +52,7 @@
       "expected": "twenty-two"
     },
     {
+      "uuid": "e417d452-129e-4056-bd5b-6eb1df334dce",
       "description": "one hundred",
       "property": "say",
       "input": {
@@ -55,6 +61,7 @@
       "expected": "one hundred"
     },
     {
+      "uuid": "d6924f30-80ba-4597-acf6-ea3f16269da8",
       "description": "one hundred twenty-three",
       "property": "say",
       "input": {
@@ -63,6 +70,7 @@
       "expected": "one hundred twenty-three"
     },
     {
+      "uuid": "3d83da89-a372-46d3-b10d-de0c792432b3",
       "description": "one thousand",
       "property": "say",
       "input": {
@@ -71,6 +79,7 @@
       "expected": "one thousand"
     },
     {
+      "uuid": "865af898-1d5b-495f-8ff0-2f06d3c73709",
       "description": "one thousand two hundred thirty-four",
       "property": "say",
       "input": {
@@ -79,6 +88,7 @@
       "expected": "one thousand two hundred thirty-four"
     },
     {
+      "uuid": "b6a3f442-266e-47a3-835d-7f8a35f6cf7f",
       "description": "one million",
       "property": "say",
       "input": {
@@ -87,6 +97,7 @@
       "expected": "one million"
     },
     {
+      "uuid": "2cea9303-e77e-4212-b8ff-c39f1978fc70",
       "description": "one million two thousand three hundred forty-five",
       "property": "say",
       "input": {
@@ -95,6 +106,7 @@
       "expected": "one million two thousand three hundred forty-five"
     },
     {
+      "uuid": "3e240eeb-f564-4b80-9421-db123f66a38f",
       "description": "one billion",
       "property": "say",
       "input": {
@@ -103,6 +115,7 @@
       "expected": "one billion"
     },
     {
+      "uuid": "9a43fed1-c875-4710-8286-5065d73b8a9e",
       "description": "a big number",
       "property": "say",
       "input": {
@@ -111,6 +124,7 @@
       "expected": "nine hundred eighty-seven billion six hundred fifty-four million three hundred twenty-one thousand one hundred twenty-three"
     },
     {
+      "uuid": "49a6a17b-084e-423e-994d-a87c0ecc05ef",
       "description": "numbers below zero are out of range",
       "property": "say",
       "input": {
@@ -119,6 +133,7 @@
       "expected": {"error": "input out of range"}
     },
     {
+      "uuid": "4d6492eb-5853-4d16-9d34-b0f61b261fd9",
       "description": "numbers above 999,999,999,999 are out of range",
       "property": "say",
       "input": {
@@ -127,4 +142,4 @@
       "expected": {"error": "input out of range"}
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/scale-generator/canonical-data.json b/exercises/scale-generator/canonical-data.json
index 69e9e24815..baf332695c 100644
--- a/exercises/scale-generator/canonical-data.json
+++ b/exercises/scale-generator/canonical-data.json
@@ -10,6 +10,7 @@
       "description": "Chromatic scales",
       "cases": [
         {
+          "uuid": "10ea7b14-8a49-40be-ac55-7c62b55f9b47",
           "description": "Chromatic scale with sharps",
           "property": "chromatic",
           "input": {
@@ -18,6 +19,7 @@
           "expected": [ "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B" ]
         },
         {
+          "uuid": "af8381de-9a72-4efd-823a-48374dbfe76f",
           "description": "Chromatic scale with flats",
           "property": "chromatic",
           "input": {
@@ -35,6 +37,7 @@
       "description": "Scales with specified intervals",
       "cases": [
         {
+          "uuid": "6f5b1410-1dd7-4c6c-b410-6b7e986f6f1e",
           "description": "Simple major scale",
           "comments": [
             "The simplest major scale, with no sharps or flats."
@@ -47,6 +50,7 @@
           "expected": [ "C", "D", "E", "F", "G", "A", "B" ]
         },
         {
+          "uuid": "13a92f89-a83e-40b5-b9d4-01136931ba02",
           "description": "Major scale with sharps",
           "property": "interval",
           "input": {
@@ -56,6 +60,7 @@
           "expected": [ "G", "A", "B", "C", "D", "E", "F#" ]
         },
         {
+          "uuid": "aa3320f6-a761-49a1-bcf6-978e0c81080a",
           "description": "Major scale with flats",
           "property": "interval",
           "input": {
@@ -65,6 +70,7 @@
           "expected": [ "F", "G", "A", "Bb", "C", "D", "E" ]
         },
         {
+          "uuid": "63daeb2f-c3f9-4c45-92be-5bf97f61ff94",
           "description": "Minor scale with sharps",
           "property": "interval",
           "input": {
@@ -74,6 +80,7 @@
           "expected": [ "F#", "G#", "A", "B", "C#", "D", "E" ]
         },
         {
+          "uuid": "616594d0-9c48-4301-949e-af1d4fad16fd",
           "description": "Minor scale with flats",
           "property": "interval",
           "input": {
@@ -83,6 +90,7 @@
           "expected": [ "Bb", "C", "Db", "Eb", "F", "Gb", "Ab" ]
         },
         {
+          "uuid": "390bd12c-5ac7-4ec7-bdde-4e58d5c78b0a",
           "description": "Dorian mode",
           "property": "interval",
           "input": {
@@ -92,6 +100,7 @@
           "expected": [ "D", "E", "F", "G", "A", "B", "C" ]
         },
         {
+          "uuid": "846d0862-0f3e-4f3b-8a2d-9cc74f017848",
           "description": "Mixolydian mode",
           "property": "interval",
           "input": {
@@ -101,6 +110,7 @@
           "expected": [ "Eb", "F", "G", "Ab", "Bb", "C", "Db" ]
         },
         {
+          "uuid": "7d49a8bb-b5f7-46ad-a207-83bd5032291a",
           "description": "Lydian mode",
           "property": "interval",
           "input": {
@@ -110,6 +120,7 @@
           "expected": [ "A", "B", "C#", "D#", "E", "F#", "G#" ]
         },
         {
+          "uuid": "a4e4dac5-1891-4160-a19f-bb06d653d4d0",
           "description": "Phrygian mode",
           "property": "interval",
           "input": {
@@ -119,6 +130,7 @@
           "expected": [ "E", "F", "G", "A", "B", "C", "D" ]
         },
         {
+          "uuid": "ef3650af-90f8-4ad9-9ef6-fdbeae07dcaa",
           "description": "Locrian mode",
           "property": "interval",
           "input": {
@@ -131,6 +143,7 @@
           "comments": [
             "Note that this case introduces the accidental interval (A)"
           ],
+          "uuid": "70517400-12b7-4530-b861-fa940ae69ee8",
           "description": "Harmonic minor",
           "property": "interval",
           "input": {
@@ -140,6 +153,7 @@
           "expected": [ "D", "E", "F", "G", "A", "Bb", "Db" ]
         },
         {
+          "uuid": "37114c0b-c54d-45da-9f4b-3848201470b0",
           "description": "Octatonic",
           "property": "interval",
           "input": {
@@ -149,6 +163,7 @@
           "expected": [ "C", "D", "D#", "F", "F#", "G#", "A", "B" ]
         },
         {
+          "uuid": "496466e7-aa45-4bbd-a64d-f41030feed9c",
           "description": "Hexatonic",
           "property": "interval",
           "input": {
@@ -158,6 +173,7 @@
           "expected": [ "Db", "Eb", "F", "G", "A", "B" ]
         },
         {
+          "uuid": "bee5d9ec-e226-47b6-b62b-847a9241f3cc",
           "description": "Pentatonic",
           "property": "interval",
           "input": {
@@ -167,6 +183,7 @@
           "expected": [ "A", "B", "C#", "E", "F#" ]
         },
         {
+          "uuid": "dbee06a6-7535-4ab7-98e8-d8a36c8402d1",
           "description": "Enigmatic",
           "property": "interval",
           "input": {
diff --git a/exercises/scrabble-score/canonical-data.json b/exercises/scrabble-score/canonical-data.json
index 7aa6ce7a29..7cb9cbc159 100644
--- a/exercises/scrabble-score/canonical-data.json
+++ b/exercises/scrabble-score/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "f46cda29-1ca5-4ef2-bd45-388a767e3db2",
       "description": "lowercase letter",
       "property": "score",
       "input": {
@@ -11,6 +12,7 @@
       "expected": 1
     },
     {
+      "uuid": "f7794b49-f13e-45d1-a933-4e48459b2201",
       "description": "uppercase letter",
       "property": "score",
       "input": {
@@ -19,6 +21,7 @@
       "expected": 1
     },
     {
+      "uuid": "eaba9c76-f9fa-49c9-a1b0-d1ba3a5b31fa",
       "description": "valuable letter",
       "property": "score",
       "input": {
@@ -27,6 +30,7 @@
       "expected": 4
     },
     {
+      "uuid": "f3c8c94e-bb48-4da2-b09f-e832e103151e",
       "description": "short word",
       "property": "score",
       "input": {
@@ -35,6 +39,7 @@
       "expected": 2
     },
     {
+      "uuid": "71e3d8fa-900d-4548-930e-68e7067c4615",
       "description": "short, valuable word",
       "property": "score",
       "input": {
@@ -43,6 +48,7 @@
       "expected": 12
     },
     {
+      "uuid": "d3088ad9-570c-4b51-8764-c75d5a430e99",
       "description": "medium word",
       "property": "score",
       "input": {
@@ -51,6 +57,7 @@
       "expected": 6
     },
     {
+      "uuid": "fa20c572-ad86-400a-8511-64512daac352",
       "description": "medium, valuable word",
       "property": "score",
       "input": {
@@ -59,6 +66,7 @@
       "expected": 22
     },
     {
+      "uuid": "9336f0ba-9c2b-4fa0-bd1c-2e2d328cf967",
       "description": "long, mixed-case word",
       "property": "score",
       "input": {
@@ -67,6 +75,7 @@
       "expected": 41
     },
     {
+      "uuid": "1e34e2c3-e444-4ea7-b598-3c2b46fd2c10",
       "description": "english-like word",
       "property": "score",
       "input": {
@@ -75,6 +84,7 @@
       "expected": 8
     },
     {
+      "uuid": "4efe3169-b3b6-4334-8bae-ff4ef24a7e4f",
       "description": "empty input",
       "property": "score",
       "input": {
@@ -83,6 +93,7 @@
       "expected": 0
     },
     {
+      "uuid": "3b305c1c-f260-4e15-a5b5-cb7d3ea7c3d7",
       "description": "entire alphabet available",
       "property": "score",
       "input": {
@@ -91,4 +102,4 @@
       "expected": 87
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/secret-handshake/canonical-data.json b/exercises/secret-handshake/canonical-data.json
index 50eaab3b78..6361e2a14d 100644
--- a/exercises/secret-handshake/canonical-data.json
+++ b/exercises/secret-handshake/canonical-data.json
@@ -19,6 +19,7 @@
       "description": "Create a handshake for a number",
       "cases": [
         {
+          "uuid": "b8496fbd-6778-468c-8054-648d03c4bb23",
           "description": "wink for 1",
           "property": "commands",
           "input": {
@@ -27,6 +28,7 @@
           "expected": ["wink"]
         },
         {
+          "uuid": "83ec6c58-81a9-4fd1-bfaf-0160514fc0e3",
           "description": "double blink for 10",
           "property": "commands",
           "input": {
@@ -35,6 +37,7 @@
           "expected": ["double blink"]
         },
         {
+          "uuid": "0e20e466-3519-4134-8082-5639d85fef71",
           "description": "close your eyes for 100",
           "property": "commands",
           "input": {
@@ -43,6 +46,7 @@
           "expected": ["close your eyes"]
         },
         {
+          "uuid": "b339ddbb-88b7-4b7d-9b19-4134030d9ac0",
           "description": "jump for 1000",
           "property": "commands",
           "input": {
@@ -51,6 +55,7 @@
           "expected": ["jump"]
         },
         {
+          "uuid": "40499fb4-e60c-43d7-8b98-0de3ca44e0eb",
           "description": "combine two actions",
           "property": "commands",
           "input": {
@@ -59,6 +64,7 @@
           "expected": ["wink", "double blink"]
         },
         {
+          "uuid": "9730cdd5-ef27-494b-afd3-5c91ad6c3d9d",
           "description": "reverse two actions",
           "property": "commands",
           "input": {
@@ -67,6 +73,7 @@
           "expected": ["double blink", "wink"]
         },
         {
+          "uuid": "0b828205-51ca-45cd-90d5-f2506013f25f",
           "description": "reversing one action gives the same action",
           "property": "commands",
           "input": {
@@ -75,6 +82,7 @@
           "expected": ["jump"]
         },
         {
+          "uuid": "9949e2ac-6c9c-4330-b685-2089ab28b05f",
           "description": "reversing no actions still gives no actions",
           "property": "commands",
           "input": {
@@ -83,6 +91,7 @@
           "expected": []
         },
         {
+          "uuid": "23fdca98-676b-4848-970d-cfed7be39f81",
           "description": "all possible actions",
           "property": "commands",
           "input": {
@@ -91,6 +100,7 @@
           "expected": ["wink", "double blink", "close your eyes", "jump"]
         },
         {
+          "uuid": "ae8fe006-d910-4d6f-be00-54b7c3799e79",
           "description": "reverse all possible actions",
           "property": "commands",
           "input": {
@@ -99,6 +109,7 @@
           "expected": ["jump", "close your eyes", "double blink", "wink"]
         },
         {
+          "uuid": "3d36da37-b31f-4cdb-a396-d93a2ee1c4a5",
           "description": "do nothing for zero",
           "property": "commands",
           "input": {
diff --git a/exercises/series/canonical-data.json b/exercises/series/canonical-data.json
index b97b6c6500..bf43e8de9e 100644
--- a/exercises/series/canonical-data.json
+++ b/exercises/series/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "cases": [
     {
+      "uuid": "7ae7a46a-d992-4c2a-9c15-a112d125ebad",
       "description": "slices of one from one",
       "property": "slices",
       "input": {
@@ -12,6 +13,7 @@
       "expected": ["1"]
     },
     {
+      "uuid": "3143b71d-f6a5-4221-aeae-619f906244d2",
       "description": "slices of one from two",
       "property": "slices",
       "input": {
@@ -21,6 +23,7 @@
       "expected": ["1", "2"]
     },
     {
+      "uuid": "dbb68ff5-76c5-4ccd-895a-93dbec6d5805",
       "description": "slices of two",
       "property": "slices",
       "input": {
@@ -30,6 +33,7 @@
       "expected": ["35"]
     },
     {
+      "uuid": "19bbea47-c987-4e11-a7d1-e103442adf86",
       "description": "slices of two overlap",
       "property": "slices",
       "input": {
@@ -39,6 +43,7 @@
       "expected": ["91", "14", "42"]
     },
     {
+      "uuid": "8e17148d-ba0a-4007-a07f-d7f87015d84c",
       "description": "slices can include duplicates",
       "property": "slices",
       "input": {
@@ -48,6 +53,7 @@
       "expected": ["777", "777", "777", "777"]
     },
     {
+      "uuid": "bd5b085e-f612-4f81-97a8-6314258278b0",
       "description": "slices of a long series",
       "property": "slices",
       "input": {
@@ -58,6 +64,7 @@
                    "93904", "39042", "90424", "04243"]
     },
     {
+      "uuid": "6d235d85-46cf-4fae-9955-14b6efef27cd",
       "description": "slice length is too large",
       "property": "slices",
       "input": {
@@ -69,6 +76,7 @@
       }
     },
     {
+      "uuid": "d34004ad-8765-4c09-8ba1-ada8ce776806",
       "description": "slice length cannot be zero",
       "property": "slices",
       "input": {
@@ -80,6 +88,7 @@
       }
     },
     {
+      "uuid": "10ab822d-8410-470a-a85d-23fbeb549e54",
       "description": "slice length cannot be negative",
       "property": "slices",
       "input": {
@@ -91,6 +100,7 @@
       }
     },
     {
+      "uuid": "c7ed0812-0e4b-4bf3-99c4-28cbbfc246a2",
       "description": "empty series is invalid",
       "property": "slices",
       "input": {
diff --git a/exercises/sgf-parsing/canonical-data.json b/exercises/sgf-parsing/canonical-data.json
index e4386ad937..2b1b2f31f1 100644
--- a/exercises/sgf-parsing/canonical-data.json
+++ b/exercises/sgf-parsing/canonical-data.json
@@ -3,6 +3,7 @@
     "version": "1.2.0",
     "cases": [
         {
+            "uuid": "2668d5dc-109f-4f71-b9d5-8d06b1d6f1cd",
             "description": "empty input",
             "property": "parse",
             "input": {
@@ -13,6 +14,7 @@
             }
         },
         {
+            "uuid": "84ded10a-94df-4a30-9457-b50ccbdca813",
             "description": "tree with no nodes",
             "property": "parse",
             "input": {
@@ -23,6 +25,7 @@
             }
         },
         {
+            "uuid": "0a6311b2-c615-4fa7-800e-1b1cbb68833d",
             "description": "node without tree",
             "property": "parse",
             "input": {
@@ -33,6 +36,7 @@
             }
         },
         {
+            "uuid": "8c419ed8-28c4-49f6-8f2d-433e706110ef",
             "description": "node without properties",
             "property": "parse",
             "input": {
@@ -44,6 +48,7 @@
             }
         },
         {
+            "uuid": "8209645f-32da-48fe-8e8f-b9b562c26b49",
             "description": "single node tree",
             "property": "parse",
             "input": {
@@ -57,6 +62,7 @@
             }
         },
         {
+            "uuid": "6c995856-b919-4c75-8fd6-c2c3c31b37dc",
             "description": "multiple properties",
             "property": "parse",
             "input": {
@@ -71,6 +77,7 @@
             }
         },
         {
+            "uuid": "a771f518-ec96-48ca-83c7-f8d39975645f",
             "description": "properties without delimiter",
             "property": "parse",
             "input": {
@@ -81,6 +88,7 @@
             }
         },
         {
+            "uuid": "6c02a24e-6323-4ed5-9962-187d19e36bc8",
             "description": "all lowercase property",
             "property": "parse",
             "input": {
@@ -91,6 +99,7 @@
             }
         },
         {
+            "uuid": "8772d2b1-3c57-405a-93ac-0703b671adc1",
             "description": "upper and lowercase property",
             "property": "parse",
             "input": {
@@ -101,6 +110,7 @@
             }
         },
         {
+            "uuid": "a759b652-240e-42ec-a6d2-3a08d834b9e2",
             "description": "two nodes",
             "property": "parse",
             "input": {
@@ -121,6 +131,7 @@
             }
         },
         {
+            "uuid": "cc7c02bc-6097-42c4-ab88-a07cb1533d00",
             "description": "two child trees",
             "property": "parse",
             "input": {
@@ -147,6 +158,7 @@
             }
         },
         {
+            "uuid": "724eeda6-00db-41b1-8aa9-4d5238ca0130",
             "description": "multiple property values",
             "property": "parse",
             "input": {
@@ -160,6 +172,7 @@
             }
         },
         {
+            "uuid": "11c36323-93fc-495d-bb23-c88ee5844b8c",
             "description": "escaped property",
             "property": "parse",
             "input": {
diff --git a/exercises/sieve/canonical-data.json b/exercises/sieve/canonical-data.json
index 18efc4401c..fe7757ee5b 100644
--- a/exercises/sieve/canonical-data.json
+++ b/exercises/sieve/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "88529125-c4ce-43cc-bb36-1eb4ddd7b44f",
       "description": "no primes under two",
       "property": "primes",
       "input": {
@@ -11,6 +12,7 @@
       "expected": []
     },
     {
+      "uuid": "4afe9474-c705-4477-9923-840e1024cc2b",
       "description": "find first prime",
       "property": "primes",
       "input": {
@@ -19,6 +21,7 @@
       "expected": [2]
     },
     {
+      "uuid": "974945d8-8cd9-4f00-9463-7d813c7f17b7",
       "description": "find primes up to 10",
       "property": "primes",
       "input": {
@@ -27,6 +30,7 @@
       "expected": [2, 3, 5, 7]
     },
     {
+      "uuid": "2e2417b7-3f3a-452a-8594-b9af08af6d82",
       "description": "limit is prime",
       "property": "primes",
       "input": {
@@ -35,6 +39,7 @@
       "expected": [2, 3, 5, 7, 11, 13]
     },
     {
+      "uuid": "92102a05-4c7c-47de-9ed0-b7d5fcd00f21",
       "description": "find primes up to 1000",
       "property": "primes",
       "input": {
diff --git a/exercises/simple-cipher/canonical-data.json b/exercises/simple-cipher/canonical-data.json
index 2f73aa0455..9a9e9da243 100644
--- a/exercises/simple-cipher/canonical-data.json
+++ b/exercises/simple-cipher/canonical-data.json
@@ -12,6 +12,7 @@
       "description": "Random key cipher",
       "cases": [
         {
+          "uuid": "b8bdfbe1-bea3-41bb-a999-b41403f2b15d",
           "description": "Can encode",
           "property": "encode",
           "input": {
@@ -20,6 +21,7 @@
           "expected": "cipher.key.substring(0, plaintext.length)"
         },
         {
+          "uuid": "3dff7f36-75db-46b4-ab70-644b3f38b81c",
           "description": "Can decode",
           "property": "decode",
           "input": {
@@ -28,6 +30,7 @@
           "expected": "aaaaaaaaaa"
         },
         {
+          "uuid": "8143c684-6df6-46ba-bd1f-dea8fcb5d265",
           "description": "Is reversible. I.e., if you apply decode in a encoded result, you must see the same plaintext encode parameter as a result of the decode method",
           "property": "decode",
           "input": {
@@ -37,6 +40,7 @@
           "expected": "abcdefghij"
         },
         {
+          "uuid": "defc0050-e87d-4840-85e4-51a1ab9dd6aa",
           "description": "Key is made only of lowercase letters",
           "property": "key",
           "input": {},
@@ -50,6 +54,7 @@
       "description": "Substitution cipher",
       "cases": [
         {
+          "uuid": "565e5158-5b3b-41dd-b99d-33b9f413c39f",
           "description": "Can encode",
           "property": "encode",
           "input": {
@@ -59,6 +64,7 @@
           "expected": "abcdefghij"
         },
         {
+          "uuid": "d44e4f6a-b8af-4e90-9d08-fd407e31e67b",
           "description": "Can decode",
           "property": "decode",
           "input": {
@@ -68,6 +74,7 @@
           "expected": "aaaaaaaaaa"
         },
         {
+          "uuid": "70a16473-7339-43df-902d-93408c69e9d1",
           "description": "Is reversible. I.e., if you apply decode in a encoded result, you must see the same plaintext encode parameter as a result of the decode method",
           "property": "decode",
           "input": {
@@ -78,6 +85,7 @@
           "expected": "abcdefghij"
         },
         {
+          "uuid": "69a1458b-92a6-433a-a02d-7beac3ea91f9",
           "description": "Can double shift encode",
           "property": "encode",
           "input": {
@@ -87,6 +95,7 @@
           "expected": "qayaeaagaciai"
         },
         {
+          "uuid": "21d207c1-98de-40aa-994f-86197ae230fb",
           "description": "Can wrap on encode",
           "property": "encode",
           "input": {
@@ -96,6 +105,7 @@
           "expected": "zabcdefghi"
         },
         {
+          "uuid": "a3d7a4d7-24a9-4de6-bdc4-a6614ced0cb3",
           "description": "Can wrap on decode",
           "property": "decode",
           "input": {
@@ -105,6 +115,7 @@
           "expected": "zzzzzzzzzz"
         },
         {
+          "uuid": "e31c9b8c-8eb6-45c9-a4b5-8344a36b9641",
           "description": "Can encode messages longer than the key",
           "property": "encode",
           "input": {
@@ -114,6 +125,7 @@
           "expected": "iboaqcnecbfcr"
         },
         {
+          "uuid": "93cfaae0-17da-4627-9a04-d6d1e1be52e3",
           "description": "Can decode messages longer than the key",
           "property": "decode",
           "input": {
diff --git a/exercises/space-age/canonical-data.json b/exercises/space-age/canonical-data.json
index 9b6b1aef4a..0e3c2d41d3 100644
--- a/exercises/space-age/canonical-data.json
+++ b/exercises/space-age/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.2.0",
   "cases": [
     {
+      "uuid": "84f609af-5a91-4d68-90a3-9e32d8a5cd34",
       "description": "age on Earth",
       "property": "age",
       "input": {
@@ -12,6 +13,7 @@
       "expected": 31.69
     },
     {
+      "uuid": "ca20c4e9-6054-458c-9312-79679ffab40b",
       "description": "age on Mercury",
       "property": "age",
       "input": {
@@ -21,6 +23,7 @@
       "expected": 280.88
     },
     {
+      "uuid": "502c6529-fd1b-41d3-8fab-65e03082b024",
       "description": "age on Venus",
       "property": "age",
       "input": {
@@ -30,6 +33,7 @@
       "expected": 9.78
     },
     {
+      "uuid": "9ceadf5e-a0d5-4388-9d40-2c459227ceb8",
       "description": "age on Mars",
       "property": "age",
       "input": {
@@ -39,6 +43,7 @@
       "expected": 35.88
     },
     {
+      "uuid": "42927dc3-fe5e-4f76-a5b5-f737fc19bcde",
       "description": "age on Jupiter",
       "property": "age",
       "input": {
@@ -48,6 +53,7 @@
       "expected": 2.41
     },
     {
+      "uuid": "8469b332-7837-4ada-b27c-00ee043ebcad",
       "description": "age on Saturn",
       "property": "age",
       "input": {
@@ -57,6 +63,7 @@
       "expected": 2.15
     },
     {
+      "uuid": "999354c1-76f8-4bb5-a672-f317b6436743",
       "description": "age on Uranus",
       "property": "age",
       "input": {
@@ -66,6 +73,7 @@
       "expected": 0.46
     },
     {
+      "uuid": "80096d30-a0d4-4449-903e-a381178355d8",
       "description": "age on Neptune",
       "property": "age",
       "input": {
@@ -75,4 +83,4 @@
       "expected": 0.35
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/spiral-matrix/canonical-data.json b/exercises/spiral-matrix/canonical-data.json
index b6e22e9b8b..91d65564a5 100644
--- a/exercises/spiral-matrix/canonical-data.json
+++ b/exercises/spiral-matrix/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "8f584201-b446-4bc9-b132-811c8edd9040",
       "description": "empty spiral",
       "property": "spiralMatrix",
       "input": {
@@ -11,6 +12,7 @@
       "expected": []
     },
     {
+      "uuid": "e40ae5f3-e2c9-4639-8116-8a119d632ab2",
       "description": "trivial spiral",
       "property": "spiralMatrix",
       "input": {
@@ -19,6 +21,7 @@
       "expected": [ [1] ]
     },
     {
+      "uuid": "cf05e42d-eb78-4098-a36e-cdaf0991bc48",
       "description": "spiral of size 2",
       "property": "spiralMatrix",
       "input": {
@@ -28,6 +31,7 @@
                   , [4, 3] ]
     },
     {
+      "uuid": "1c475667-c896-4c23-82e2-e033929de939",
       "description": "spiral of size 3",
       "property": "spiralMatrix",
       "input": {
@@ -38,6 +42,7 @@
                   , [7, 6, 5] ]
     },
     {
+      "uuid": "05ccbc48-d891-44f5-9137-f4ce462a759d",
       "description": "spiral of size 4",
       "property": "spiralMatrix",
       "input": {
@@ -49,6 +54,7 @@
                   , [10,  9,  8, 7] ]
     },
     {
+      "uuid": "f4d2165b-1738-4e0c-bed0-c459045ae50d",
       "description": "spiral of size 5",
       "property": "spiralMatrix",
       "input": {
diff --git a/exercises/sublist/canonical-data.json b/exercises/sublist/canonical-data.json
index ac066fe300..b9fb09619a 100644
--- a/exercises/sublist/canonical-data.json
+++ b/exercises/sublist/canonical-data.json
@@ -16,6 +16,7 @@
   ],
   "cases": [
     {
+      "uuid": "97319c93-ebc5-47ab-a022-02a1980e1d29",
       "description": "empty lists",
       "property": "sublist",
       "input": {
@@ -25,6 +26,7 @@
       "expected": "equal"
     },
     {
+      "uuid": "de27dbd4-df52-46fe-a336-30be58457382",
       "description": "empty list within non empty list",
       "property": "sublist",
       "input": {
@@ -34,6 +36,7 @@
       "expected": "sublist"
     },
     {
+      "uuid": "5487cfd1-bc7d-429f-ac6f-1177b857d4fb",
       "description": "non empty list contains empty list",
       "property": "sublist",
       "input": {
@@ -43,6 +46,7 @@
       "expected": "superlist"
     },
     {
+      "uuid": "1f390b47-f6b2-4a93-bc23-858ba5dda9a6",
       "description": "list equals itself",
       "property": "sublist",
       "input": {
@@ -52,6 +56,7 @@
       "expected": "equal"
     },
     {
+      "uuid": "7ed2bfb2-922b-4363-ae75-f3a05e8274f5",
       "description": "different lists",
       "property": "sublist",
       "input": {
@@ -61,6 +66,7 @@
       "expected": "unequal"
     },
     {
+      "uuid": "3b8a2568-6144-4f06-b0a1-9d266b365341",
       "description": "false start",
       "property": "sublist",
       "input": {
@@ -70,6 +76,7 @@
       "expected": "sublist"
     },
     {
+      "uuid": "dc39ed58-6311-4814-be30-05a64bc8d9b1",
       "description": "consecutive",
       "property": "sublist",
       "input": {
@@ -79,6 +86,7 @@
       "expected": "sublist"
     },
     {
+      "uuid": "d1270dab-a1ce-41aa-b29d-b3257241ac26",
       "description": "sublist at start",
       "property": "sublist",
       "input": {
@@ -88,6 +96,7 @@
       "expected": "sublist"
     },
     {
+      "uuid": "81f3d3f7-4f25-4ada-bcdc-897c403de1b6",
       "description": "sublist in middle",
       "property": "sublist",
       "input": {
@@ -97,6 +106,7 @@
       "expected": "sublist"
     },
     {
+      "uuid": "43bcae1e-a9cf-470e-923e-0946e04d8fdd",
       "description": "sublist at end",
       "property": "sublist",
       "input": {
@@ -106,6 +116,7 @@
       "expected": "sublist"
     },
     {
+      "uuid": "76cf99ed-0ff0-4b00-94af-4dfb43fe5caa",
       "description": "at start of superlist",
       "property": "sublist",
       "input": {
@@ -115,6 +126,7 @@
       "expected": "superlist"
     },
     {
+      "uuid": "b83989ec-8bdf-4655-95aa-9f38f3e357fd",
       "description": "in middle of superlist",
       "property": "sublist",
       "input": {
@@ -124,6 +136,7 @@
       "expected": "superlist"
     },
     {
+      "uuid": "26f9f7c3-6cf6-4610-984a-662f71f8689b",
       "description": "at end of superlist",
       "property": "sublist",
       "input": {
@@ -133,6 +146,7 @@
       "expected": "superlist"
     },
     {
+      "uuid": "0a6db763-3588-416a-8f47-76b1cedde31e",
       "description": "first list missing element from second list",
       "property": "sublist",
       "input": {
@@ -142,6 +156,7 @@
       "expected": "unequal"
     },
     {
+      "uuid": "83ffe6d8-a445-4a3c-8795-1e51a95e65c3",
       "description": "second list missing element from first list",
       "property": "sublist",
       "input": {
@@ -151,6 +166,7 @@
       "expected": "unequal"
     },
     {
+      "uuid": "0d7ee7c1-0347-45c8-9ef5-b88db152b30b",
       "description": "order matters to a list",
       "property": "sublist",
       "input": {
@@ -160,6 +176,7 @@
       "expected": "unequal"
     },
     {
+      "uuid": "5f47ce86-944e-40f9-9f31-6368aad70aa6",
       "description": "same digits but different numbers",
       "property": "sublist",
       "input": {
diff --git a/exercises/sum-of-multiples/canonical-data.json b/exercises/sum-of-multiples/canonical-data.json
index daba19defd..aea19e40e9 100644
--- a/exercises/sum-of-multiples/canonical-data.json
+++ b/exercises/sum-of-multiples/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.5.0",
   "cases": [
     {
+      "uuid": "54aaab5a-ce86-4edc-8b40-d3ab2400a279",
       "description": "no multiples within limit",
       "property": "sum",
       "input": {
@@ -12,6 +13,7 @@
       "expected": 0
     },
     {
+      "uuid": "361e4e50-c89b-4f60-95ef-5bc5c595490a",
       "description": "one factor has multiples within limit",
       "property": "sum",
       "input": {
@@ -21,6 +23,7 @@
       "expected": 3
     },
     {
+      "uuid": "e644e070-040e-4ae0-9910-93c69fc3f7ce",
       "description": "more than one multiple within limit",
       "property": "sum",
       "input": {
@@ -30,6 +33,7 @@
       "expected": 9
     },
     {
+      "uuid": "607d6eb9-535c-41ce-91b5-3a61da3fa57f",
       "description": "more than one factor with multiples within limit",
       "property": "sum",
       "input": {
@@ -39,6 +43,7 @@
       "expected": 23
     },
     {
+      "uuid": "f47e8209-c0c5-4786-b07b-dc273bf86b9b",
       "description": "each multiple is only counted once",
       "property": "sum",
       "input": {
@@ -48,6 +53,7 @@
       "expected": 2318
     },
     {
+      "uuid": "28c4b267-c980-4054-93e9-07723db615ac",
       "description": "a much larger limit",
       "property": "sum",
       "input": {
@@ -57,6 +63,7 @@
       "expected": 233168
     },
     {
+      "uuid": "09c4494d-ff2d-4e0f-8421-f5532821ee12",
       "description": "three factors",
       "property": "sum",
       "input": {
@@ -66,6 +73,7 @@
       "expected": 51
     },
     {
+      "uuid": "2d0d5faa-f177-4ad6-bde9-ebb865083751",
       "description": "factors not relatively prime",
       "property": "sum",
       "input": {
@@ -75,6 +83,7 @@
       "expected": 30
     },
     {
+      "uuid": "ece8f2e8-96aa-4166-bbb7-6ce71261e354",
       "description": "some pairs of factors relatively prime and some not",
       "property": "sum",
       "input": {
@@ -84,6 +93,7 @@
       "expected": 4419
     },
     {
+      "uuid": "624fdade-6ffb-400e-8472-456a38c171c0",
       "description": "one factor is a multiple of another",
       "property": "sum",
       "input": {
@@ -93,6 +103,7 @@
       "expected": 275
     },
     {
+      "uuid": "949ee7eb-db51-479c-b5cb-4a22b40ac057",
       "description": "much larger factors",
       "property": "sum",
       "input": {
@@ -102,6 +113,7 @@
       "expected": 2203160
     },
     {
+      "uuid": "41093673-acbd-482c-ab80-d00a0cbedecd",
       "description": "all numbers are multiples of 1",
       "property": "sum",
       "input": {
@@ -111,6 +123,7 @@
       "expected": 4950
     },
     {
+      "uuid": "1730453b-baaa-438e-a9c2-d754497b2a76",
       "description": "no factors means an empty sum",
       "property": "sum",
       "input": {
@@ -120,6 +133,7 @@
       "expected": 0
     },
     {
+      "uuid": "214a01e9-f4bf-45bb-80f1-1dce9fbb0310",
       "description": "the only multiple of 0 is 0",
       "property": "sum",
       "input": {
@@ -129,6 +143,7 @@
       "expected": 0
     },
     {
+      "uuid": "c423ae21-a0cb-4ec7-aeb1-32971af5b510",
       "description": "the factor 0 does not affect the sum of multiples of other factors",
       "property": "sum",
       "input": {
@@ -138,6 +153,7 @@
       "expected": 3
     },
     {
+      "uuid": "17053ba9-112f-4ac0-aadb-0519dd836342",
       "description": "solutions using include-exclude must extend to cardinality greater than 3",
       "property": "sum",
       "input": {
diff --git a/exercises/tournament/canonical-data.json b/exercises/tournament/canonical-data.json
index f1e0386abe..70b4fde566 100644
--- a/exercises/tournament/canonical-data.json
+++ b/exercises/tournament/canonical-data.json
@@ -11,6 +11,7 @@
   ],
   "cases": [
     {
+      "uuid": "67e9fab1-07c1-49cf-9159-bc8671cc7c9c",
       "description": "just the header if no input",
       "property": "tally",
       "input": {
@@ -19,6 +20,7 @@
       "expected": [ "Team                           | MP |  W |  D |  L |  P" ]
     },
     {
+      "uuid": "1b4a8aef-0734-4007-80a2-0626178c88f4",
       "description": "a win is three points, a loss is zero points",
       "property": "tally",
       "input": {
@@ -33,6 +35,7 @@
 		]
 	},
     {
+      "uuid": "5f45ac09-4efe-46e7-8ddb-75ad85f86e05",
       "description": "a win can also be expressed as a loss",
       "property": "tally",
       "input": {
@@ -47,6 +50,7 @@
 		]
 	},
     {
+      "uuid": "fd297368-efa0-442d-9f37-dd3f9a437239",
       "description": "a different team can win",
       "property": "tally",
       "input": {
@@ -61,6 +65,7 @@
 		]
 	},
     {
+      "uuid": "26c016f9-e753-4a93-94e9-842f7b4d70fc",
       "description": "a draw is one point each",
       "property": "tally",
       "input": {
@@ -75,6 +80,7 @@
 		]
 	},
     {
+      "uuid": "731204f6-4f34-4928-97eb-1c307ba83e62",
       "description": "There can be more than one match",
       "property": "tally",
       "input": {
@@ -90,6 +96,7 @@
 		]
 	},
     {
+      "uuid": "49dc2463-42af-4ea6-95dc-f06cc5776adf",
       "description": "There can be more than one winner",
       "property": "tally",
       "input": {
@@ -105,6 +112,7 @@
 		]
 	},
     {
+      "uuid": "6d930f33-435c-4e6f-9e2d-63fa85ce7dc7",
       "description": "There can be more than two teams",
       "property": "tally",
       "input": {
@@ -122,6 +130,7 @@
 		]
 	},
     {
+      "uuid": "97022974-0c8a-4a50-8fe7-e36bdd8a5945",
       "description": "typical input",
       "property": "tally",
       "input": {
@@ -143,6 +152,7 @@
       ]
     },
     {
+      "uuid": "fe562f0d-ac0a-4c62-b9c9-44ee3236392b",
       "description": "incomplete competition (not all pairs have played)",
       "property": "tally",
       "input": {
@@ -162,6 +172,7 @@
       ]
     },
     {
+      "uuid": "3aa0386f-150b-4f99-90bb-5195e7b7d3b8",
       "description": "ties broken alphabetically",
       "property": "tally",
       "input": {
diff --git a/exercises/transpose/canonical-data.json b/exercises/transpose/canonical-data.json
index 8ad5a4c474..71b2ff62a3 100644
--- a/exercises/transpose/canonical-data.json
+++ b/exercises/transpose/canonical-data.json
@@ -8,6 +8,7 @@
   ],
   "cases": [
     {
+      "uuid": "404b7262-c050-4df0-a2a2-0cb06cd6a821",
       "description": "empty string",
       "property": "transpose",
       "input": {
@@ -16,6 +17,7 @@
       "expected": []
     },
     {
+      "uuid": "a89ce8a3-c940-4703-a688-3ea39412fbcb",
       "description": "two characters in a row",
       "property": "transpose",
       "input": {
@@ -29,6 +31,7 @@
       ]
     },
     {
+      "uuid": "855bb6ae-4180-457c-abd0-ce489803ce98",
       "description": "two characters in a column",
       "property": "transpose",
       "input": {
@@ -42,6 +45,7 @@
       ]
     },
     {
+      "uuid": "5ceda1c0-f940-441c-a244-0ced197769c8",
       "description": "simple",
       "property": "transpose",
       "input": {
@@ -57,6 +61,7 @@
       ]
     },
     {
+      "uuid": "a54675dd-ae7d-4a58-a9c4-0c20e99a7c1f",
       "description": "single line",
       "property": "transpose",
       "input": {
@@ -78,6 +83,7 @@
       ]
     },
     {
+      "uuid": "0dc2ec0b-549d-4047-aeeb-8029fec8d5c5",
       "description": "first line longer than second line",
       "property": "transpose",
       "input": {
@@ -106,6 +112,7 @@
       ]
     },
     {
+      "uuid": "984e2ec3-b3d3-4b53-8bd6-96f5ef404102",
       "description": "second line longer than first line",
       "property": "transpose",
       "input": {
@@ -134,6 +141,7 @@
       ]
     },
     {
+      "uuid": "eccd3784-45f0-4a3f-865a-360cb323d314",
       "description": "mixed line length",
       "property": "transpose",
       "input": {
@@ -165,6 +173,7 @@
       ]
     },
     {
+      "uuid": "85b96b3f-d00c-4f80-8ca2-c8a5c9216c2d",
       "description": "square",
       "property": "transpose",
       "input": {
@@ -185,6 +194,7 @@
       ]
     },
     {
+      "uuid": "b9257625-7a53-4748-8863-e08e9d27071d",
       "description": "rectangle",
       "property": "transpose",
       "input": {
@@ -207,6 +217,7 @@
       ]
     },
     {
+      "uuid": "b80badc9-057e-4543-bd07-ce1296a1ea2c",
       "description": "triangle",
       "property": "transpose",
       "input": {
diff --git a/exercises/triangle/canonical-data.json b/exercises/triangle/canonical-data.json
index 420e775bab..6a6e5aecbb 100644
--- a/exercises/triangle/canonical-data.json
+++ b/exercises/triangle/canonical-data.json
@@ -22,6 +22,7 @@
       "description": "equilateral triangle",
       "cases": [
         {
+          "uuid": "8b2c43ac-7257-43f9-b552-7631a91988af",
           "description": "all sides are equal",
           "property": "equilateral",
           "input": {
@@ -30,6 +31,7 @@
           "expected": true
         },
         {
+          "uuid": "33eb6f87-0498-4ccf-9573-7f8c3ce92b7b",
           "description": "any side is unequal",
           "property": "equilateral",
           "input": {
@@ -38,6 +40,7 @@
           "expected": false
         },
         {
+          "uuid": "c6585b7d-a8c0-4ad8-8a34-e21d36f7ad87",
           "description": "no sides are equal",
           "property": "equilateral",
           "input": {
@@ -46,6 +49,7 @@
           "expected": false
         },
         {
+          "uuid": "16e8ceb0-eadb-46d1-b892-c50327479251",
           "description": "all zero sides is not a triangle",
           "property": "equilateral",
           "input": {
@@ -58,6 +62,7 @@
             " Your track may choose to skip this test    ",
             " and deal only with integers if appropriate "
           ],
+          "uuid": "3022f537-b8e5-4cc1-8f12-fd775827a00c",
           "description": "sides may be floats",
           "property": "equilateral",
           "input": {
@@ -71,6 +76,7 @@
       "description": "isosceles triangle",
       "cases": [
         {
+          "uuid": "cbc612dc-d75a-4c1c-87fc-e2d5edd70b71",
           "description": "last two sides are equal",
           "property": "isosceles",
           "input": {
@@ -79,6 +85,7 @@
           "expected": true
         },
         {
+          "uuid": "e388ce93-f25e-4daf-b977-4b7ede992217",
           "description": "first two sides are equal",
           "property": "isosceles",
           "input": {
@@ -87,6 +94,7 @@
           "expected": true
         },
         {
+          "uuid": "d2080b79-4523-4c3f-9d42-2da6e81ab30f",
           "description": "first and last sides are equal",
           "property": "isosceles",
           "input": {
@@ -95,6 +103,7 @@
           "expected": true
         },
         {
+          "uuid": "8d71e185-2bd7-4841-b7e1-71689a5491d8",
           "description": "equilateral triangles are also isosceles",
           "property": "isosceles",
           "input": {
@@ -103,6 +112,7 @@
           "expected": true
         },
         {
+          "uuid": "840ed5f8-366f-43c5-ac69-8f05e6f10bbb",
           "description": "no sides are equal",
           "property": "isosceles",
           "input": {
@@ -111,6 +121,7 @@
           "expected": false
         },
         {
+          "uuid": "2eba0cfb-6c65-4c40-8146-30b608905eae",
           "description": "first triangle inequality violation",
           "property": "isosceles",
           "input": {
@@ -119,6 +130,7 @@
           "expected": false
         },
         {
+          "uuid": "278469cb-ac6b-41f0-81d4-66d9b828f8ac",
           "description": "second triangle inequality violation",
           "property": "isosceles",
           "input": {
@@ -127,6 +139,7 @@
           "expected": false
         },
         {
+          "uuid": "90efb0c7-72bb-4514-b320-3a3892e278ff",
           "description": "third triangle inequality violation",
           "property": "isosceles",
           "input": {
@@ -135,6 +148,7 @@
           "expected": false
         },
         {
+          "uuid": "adb4ee20-532f-43dc-8d31-e9271b7ef2bc",
           "comments": [
             " Your track may choose to skip this test    ",
             " and deal only with integers if appropriate "
@@ -152,6 +166,7 @@
       "description": "scalene triangle",
       "cases": [
         {
+          "uuid": "e8b5f09c-ec2e-47c1-abec-f35095733afb",
           "description": "no sides are equal",
           "property": "scalene",
           "input": {
@@ -160,6 +175,7 @@
           "expected": true
         },
         {
+          "uuid": "2510001f-b44d-4d18-9872-2303e7977dc1",
           "description": "all sides are equal",
           "property": "scalene",
           "input": {
@@ -168,6 +184,7 @@
           "expected": false
         },
         {
+          "uuid": "c6e15a92-90d9-4fb3-90a2-eef64f8d3e1e",
           "description": "two sides are equal",
           "property": "scalene",
           "input": {
@@ -176,6 +193,7 @@
           "expected": false
         },
         {
+          "uuid": "70ad5154-0033-48b7-af2c-b8d739cd9fdc",
           "description": "may not violate triangle inequality",
           "property": "scalene",
           "input": {
@@ -188,6 +206,7 @@
             " Your track may choose to skip this test    ",
             " and deal only with integers if appropriate "
           ],
+          "uuid": "26d9d59d-f8f1-40d3-ad58-ae4d54123d7d",
           "description": "sides may be floats",
           "property": "scalene",
           "input": {
diff --git a/exercises/trinary/canonical-data.json b/exercises/trinary/canonical-data.json
index 18ae38c5ba..f4d3710a6a 100644
--- a/exercises/trinary/canonical-data.json
+++ b/exercises/trinary/canonical-data.json
@@ -6,6 +6,7 @@
       "description": "returns the decimal representation of the input trinary value",
       "cases": [
         {
+          "uuid": "a7a79a9e-5606-454c-9cdb-4f3c0ca46931",
           "description": "trinary 1 is decimal 1",
           "property": "toDecimal",
           "input": {
@@ -14,6 +15,7 @@
           "expected": 1
         },
         {
+          "uuid": "39240078-13e2-4eb8-87c4-aeffa7d64130",
           "description": "trinary 2 is decimal 2",
           "property": "toDecimal",
           "input": {
@@ -22,6 +24,7 @@
           "expected": 2
         },
         {
+          "uuid": "81900d67-7e07-4d41-a71e-86f1cd72ce1f",
           "description": "trinary 10 is decimal 3",
           "property": "toDecimal",
           "input": {
@@ -30,6 +33,7 @@
           "expected": 3
         },
         {
+          "uuid": "7a8d5341-f88a-4c60-9048-4d5e017fa701",
           "description": "trinary 11 is decimal 4",
           "property": "toDecimal",
           "input": {
@@ -38,6 +42,7 @@
           "expected": 4
         },
         {
+          "uuid": "6b3c37f6-d6b3-4575-85c0-19f48dd101af",
           "description": "trinary 100 is decimal 9",
           "property": "toDecimal",
           "input": {
@@ -46,6 +51,7 @@
           "expected": 9
         },
         {
+          "uuid": "a210b2b8-d333-4e19-9e59-87cabdd2a0ba",
           "description": "trinary 112 is decimal 14",
           "property": "toDecimal",
           "input": {
@@ -54,6 +60,7 @@
           "expected": 14
         },
         {
+          "uuid": "5ae03472-b942-42ce-ba00-e84a7dc86dd8",
           "description": "trinary 222 is decimal 26",
           "property": "toDecimal",
           "input": {
@@ -62,6 +69,7 @@
           "expected": 26
         },
         {
+          "uuid": "d4fabf94-6149-4d1e-b42f-b34dc3ddef8f",
           "description": "trinary 1122000120 is decimal 32091",
           "property": "toDecimal",
           "input": {
@@ -70,6 +78,7 @@
           "expected": 32091
         },
         {
+          "uuid": "34be152d-38f3-4dcf-b5ab-9e14fe2f7161",
           "description": "invalid trinary digits returns 0",
           "property": "toDecimal",
           "input": {
@@ -78,6 +87,7 @@
           "expected": 0
         },
         {
+          "uuid": "b57aa24d-3da2-4787-9429-5bc94d3112d6",
           "description": "invalid word as input returns 0",
           "property": "toDecimal",
           "input": {
@@ -86,6 +96,7 @@
           "expected": 0
         },
         {
+          "uuid": "673c2057-5d89-483c-87fa-139da6927b90",
           "description": "invalid numbers with letters as input returns 0",
           "property": "toDecimal",
           "input": {
diff --git a/exercises/twelve-days/canonical-data.json b/exercises/twelve-days/canonical-data.json
index fc7fd7a468..fbbfb182e0 100644
--- a/exercises/twelve-days/canonical-data.json
+++ b/exercises/twelve-days/canonical-data.json
@@ -11,6 +11,7 @@
       "description": "verse",
       "cases": [
         {
+          "uuid": "c0b5a5e6-c89d-49b1-a6b2-9f523bff33f7",
           "description": "first day a partridge in a pear tree",
           "property": "recite",
           "input": {
@@ -22,6 +23,7 @@
           ]
         },
         {
+          "uuid": "1c64508a-df3d-420a-b8e1-fe408847854a",
           "description": "second day two turtle doves",
           "property": "recite",
           "input": {
@@ -33,6 +35,7 @@
           ]
         },
         {
+          "uuid": "a919e09c-75b2-4e64-bb23-de4a692060a8",
           "description": "third day three french hens",
           "property": "recite",
           "input": {
@@ -44,6 +47,7 @@
           ]
         },
         {
+          "uuid": "9bed8631-ec60-4894-a3bb-4f0ec9fbe68d",
           "description": "fourth day four calling birds",
           "property": "recite",
           "input": {
@@ -55,6 +59,7 @@
           ]
         },
         {
+          "uuid": "cf1024f0-73b6-4545-be57-e9cea565289a",
           "description": "fifth day five gold rings",
           "property": "recite",
           "input": {
@@ -66,6 +71,7 @@
           ]
         },
         {
+          "uuid": "50bd3393-868a-4f24-a618-68df3d02ff04",
           "description": "sixth day six geese-a-laying",
           "property": "recite",
           "input": {
@@ -77,6 +83,7 @@
           ]
         },
         {
+          "uuid": "8f29638c-9bf1-4680-94be-e8b84e4ade83",
           "description": "seventh day seven swans-a-swimming",
           "property": "recite",
           "input": {
@@ -88,6 +95,7 @@
           ]
         },
         {
+          "uuid": "7038d6e1-e377-47ad-8c37-10670a05bc05",
           "description": "eighth day eight maids-a-milking",
           "property": "recite",
           "input": {
@@ -99,6 +107,7 @@
           ]
         },
         {
+          "uuid": "37a800a6-7a56-4352-8d72-0f51eb37cfe8",
           "description": "ninth day nine ladies dancing",
           "property": "recite",
           "input": {
@@ -110,6 +119,7 @@
           ]
         },
         {
+          "uuid": "10b158aa-49ff-4b2d-afc3-13af9133510d",
           "description": "tenth day ten lords-a-leaping",
           "property": "recite",
           "input": {
@@ -121,6 +131,7 @@
           ]
         },
         {
+          "uuid": "08d7d453-f2ba-478d-8df0-d39ea6a4f457",
           "description": "eleventh day eleven pipers piping",
           "property": "recite",
           "input": {
@@ -132,6 +143,7 @@
           ]
         },
         {
+          "uuid": "0620fea7-1704-4e48-b557-c05bf43967f0",
           "description": "twelfth day twelve drummers drumming",
           "property": "recite",
           "input": {
@@ -148,6 +160,7 @@
       "description": "lyrics",
       "cases": [
         {
+          "uuid": "da8b9013-b1e8-49df-b6ef-ddec0219e398",
           "description": "recites first three verses of the song",
           "property": "recite",
           "input": {
@@ -161,6 +174,7 @@
           ]
         },
         {
+          "uuid": "c095af0d-3137-4653-ad32-bfb899eda24c",
           "description": "recites three verses from the middle of the song",
           "property": "recite",
           "input": {
@@ -174,6 +188,7 @@
           ]
         },
         {
+          "uuid": "20921bc9-cc52-4627-80b3-198cbbfcf9b7",
           "description": "recites the whole song",
           "property": "recite",
           "input": {
@@ -198,4 +213,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/two-bucket/canonical-data.json b/exercises/two-bucket/canonical-data.json
index 44b053d5aa..bec29c4895 100644
--- a/exercises/two-bucket/canonical-data.json
+++ b/exercises/two-bucket/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.4.0",
   "cases": [
     {
+      "uuid": "a6f2b4ba-065f-4dca-b6f0-e3eee51cb661",
       "description": "Measure using bucket one of size 3 and bucket two of size 5 - start with bucket one",
       "property": "measure",
       "input": {
@@ -18,6 +19,7 @@
       }
     },
     {
+      "uuid": "6c4ea451-9678-4926-b9b3-68364e066d40",
       "description": "Measure using bucket one of size 3 and bucket two of size 5 - start with bucket two",
       "property": "measure",
       "input": {
@@ -33,6 +35,7 @@
       }
     },
     {
+      "uuid": "3389f45e-6a56-46d5-9607-75aa930502ff",
       "description": "Measure using bucket one of size 7 and bucket two of size 11 - start with bucket one",
       "property": "measure",
       "input": {
@@ -48,6 +51,7 @@
       }
     },
     {
+      "uuid": "fe0ff9a0-3ea5-4bf7-b17d-6d4243961aa1",
       "description": "Measure using bucket one of size 7 and bucket two of size 11 - start with bucket two",
       "property": "measure",
       "input": {
@@ -63,6 +67,7 @@
       }
     },
     {
+      "uuid": "0ee1f57e-da84-44f7-ac91-38b878691602",
       "description": "Measure one step using bucket one of size 1 and bucket two of size 3 - start with bucket two",
       "property": "measure",
       "input": {
@@ -78,6 +83,7 @@
       }
     },
     {
+      "uuid": "eb329c63-5540-4735-b30b-97f7f4df0f84",
       "description": "Measure using bucket one of size 2 and bucket two of size 3 - start with bucket one and end with bucket two",
       "property": "measure",
       "input": {
@@ -93,4 +99,4 @@
       }
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/two-fer/canonical-data.json b/exercises/two-fer/canonical-data.json
index 9b043575c1..6129b41f3c 100644
--- a/exercises/two-fer/canonical-data.json
+++ b/exercises/two-fer/canonical-data.json
@@ -3,6 +3,7 @@
   "version": "1.2.0",
   "cases": [
     {
+      "uuid": "1cf3e15a-a3d7-4a87-aeb3-ba1b43bc8dce",
       "description": "no name given",
       "property": "twoFer",
       "input": {
@@ -11,6 +12,7 @@
       "expected": "One for you, one for me."
     },
     {
+      "uuid": "b4c6dbb8-b4fb-42c2-bafd-10785abe7709",
       "description": "a name given",
       "property": "twoFer",
       "input": {
@@ -19,6 +21,7 @@
       "expected": "One for Alice, one for me."
     },
     {
+      "uuid": "3549048d-1a6e-4653-9a79-b0bda163e8d5",
       "description": "another name given",
       "property": "twoFer",
       "input": {
@@ -27,4 +30,4 @@
       "expected": "One for Bob, one for me."
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/variable-length-quantity/canonical-data.json b/exercises/variable-length-quantity/canonical-data.json
index 558ce0fe12..dc771feb1e 100644
--- a/exercises/variable-length-quantity/canonical-data.json
+++ b/exercises/variable-length-quantity/canonical-data.json
@@ -12,6 +12,7 @@
       "description": "Encode a series of integers, producing a series of bytes.",
       "cases": [
         {
+          "uuid": "35c9db2e-f781-4c52-b73b-8e76427defd0",
           "description": "zero",
           "property": "encode",
           "input": {
@@ -20,6 +21,7 @@
           "expected": [0]
         },
         {
+          "uuid": "be44d299-a151-4604-a10e-d4b867f41540",
           "description": "arbitrary single byte",
           "property": "encode",
           "input": {
@@ -28,6 +30,7 @@
           "expected": [64]
         },
         {
+          "uuid": "ea399615-d274-4af6-bbef-a1c23c9e1346",
           "description": "largest single byte",
           "property": "encode",
           "input": {
@@ -36,6 +39,7 @@
           "expected": [127]
         },
         {
+          "uuid": "77b07086-bd3f-4882-8476-8dcafee79b1c",
           "description": "smallest double byte",
           "property": "encode",
           "input": {
@@ -44,6 +48,7 @@
           "expected": [129,0]
         },
         {
+          "uuid": "63955a49-2690-4e22-a556-0040648d6b2d",
           "description": "arbitrary double byte",
           "property": "encode",
           "input": {
@@ -52,6 +57,7 @@
           "expected": [192, 0]
         },
         {
+          "uuid": "29da7031-0067-43d3-83a7-4f14b29ed97a",
           "description": "largest double byte",
           "property": "encode",
           "input": {
@@ -60,6 +66,7 @@
           "expected": [255, 127]
         },
         {
+          "uuid": "3345d2e3-79a9-4999-869e-d4856e3a8e01",
           "description": "smallest triple byte",
           "property": "encode",
           "input": {
@@ -68,6 +75,7 @@
           "expected": [129, 128, 0]
         },
         {
+          "uuid": "5df0bc2d-2a57-4300-a653-a75ee4bd0bee",
           "description": "arbitrary triple byte",
           "property": "encode",
           "input": {
@@ -76,6 +84,7 @@
           "expected": [192, 128, 0]
         },
         {
+          "uuid": "f51d8539-312d-4db1-945c-250222c6aa22",
           "description": "largest triple byte",
           "property": "encode",
           "input": {
@@ -84,6 +93,7 @@
           "expected": [255, 255, 127]
         },
         {
+          "uuid": "da78228b-544f-47b7-8bfe-d16b35bbe570",
           "description": "smallest quadruple byte",
           "property": "encode",
           "input": {
@@ -92,6 +102,7 @@
           "expected": [129, 128, 128, 0]
         },
         {
+          "uuid": "11ed3469-a933-46f1-996f-2231e05d7bb6",
           "description": "arbitrary quadruple byte",
           "property": "encode",
           "input": {
@@ -100,6 +111,7 @@
           "expected": [192, 128, 128, 0]
         },
         {
+          "uuid": "d5f3f3c3-e0f1-4e7f-aad0-18a44f223d1c",
           "description": "largest quadruple byte",
           "property": "encode",
           "input": {
@@ -108,6 +120,7 @@
           "expected": [255, 255, 255, 127]
         },
         {
+          "uuid": "91a18b33-24e7-4bfb-bbca-eca78ff4fc47",
           "description": "smallest quintuple byte",
           "property": "encode",
           "input": {
@@ -116,6 +129,7 @@
           "expected": [129, 128, 128, 128, 0]
         },
         {
+          "uuid": "5f34ff12-2952-4669-95fe-2d11b693d331",
           "description": "arbitrary quintuple byte",
           "property": "encode",
           "input": {
@@ -124,6 +138,7 @@
           "expected": [143, 248, 128, 128, 0]
         },
         {
+          "uuid": "7489694b-88c3-4078-9864-6fe802411009",
           "description": "maximum 32-bit integer input",
           "property": "encode",
           "input": {
@@ -132,6 +147,7 @@
           "expected": [143, 255, 255, 255, 127]
         },
         {
+          "uuid": "f9b91821-cada-4a73-9421-3c81d6ff3661",
           "description": "two single-byte values",
           "property": "encode",
           "input": {
@@ -140,6 +156,7 @@
           "expected": [64, 127]
         },
         {
+          "uuid": "68694449-25d2-4974-ba75-fa7bb36db212",
           "description": "two multi-byte values",
           "property": "encode",
           "input": {
@@ -148,6 +165,7 @@
           "expected": [129, 128, 0, 200, 232, 86]
         },
         {
+          "uuid": "51a06b5c-de1b-4487-9a50-9db1b8930d85",
           "description": "many multi-byte values",
           "property": "encode",
           "input": {
@@ -161,6 +179,7 @@
       "description": "Decode a series of bytes, producing a series of integers.",
       "cases": [
         {
+          "uuid": "baa73993-4514-4915-bac0-f7f585e0e59a",
           "description": "one byte",
           "property": "decode",
           "input": {
@@ -169,6 +188,7 @@
           "expected": [127]
         },
         {
+          "uuid": "72e94369-29f9-46f2-8c95-6c5b7a595aee",
           "description": "two bytes",
           "property": "decode",
           "input": {
@@ -177,6 +197,7 @@
           "expected": [8192]
         },
         {
+          "uuid": "df5a44c4-56f7-464e-a997-1db5f63ce691",
           "description": "three bytes",
           "property": "decode",
           "input": {
@@ -185,6 +206,7 @@
           "expected": [2097151]
         },
         {
+          "uuid": "1bb58684-f2dc-450a-8406-1f3452aa1947",
           "description": "four bytes",
           "property": "decode",
           "input": {
@@ -193,6 +215,7 @@
           "expected": [2097152]
         },
         {
+          "uuid": "cecd5233-49f1-4dd1-a41a-9840a40f09cd",
           "description": "maximum 32-bit integer",
           "property": "decode",
           "input": {
@@ -201,6 +224,7 @@
           "expected": [4294967295]
         },
         {
+          "uuid": "e7d74ba3-8b8e-4bcb-858d-d08302e15695",
           "description": "incomplete sequence causes error",
           "property": "decode",
           "input": {
@@ -209,6 +233,7 @@
           "expected": {"error": "incomplete sequence"}
         },
         {
+          "uuid": "aa378291-9043-4724-bc53-aca1b4a3fcb6",
           "description": "incomplete sequence causes error, even if value is zero",
           "property": "decode",
           "input": {
@@ -217,6 +242,7 @@
           "expected": {"error": "incomplete sequence"}
         },
         {
+          "uuid": "a91e6f5a-c64a-48e3-8a75-ce1a81e0ebee",
           "description": "multiple values",
           "property": "decode",
           "input": {
diff --git a/exercises/word-count/canonical-data.json b/exercises/word-count/canonical-data.json
index f991a610ff..55fcc96542 100644
--- a/exercises/word-count/canonical-data.json
+++ b/exercises/word-count/canonical-data.json
@@ -7,6 +7,7 @@
   ],
   "cases": [
     {
+      "uuid": "61559d5f-2cad-48fb-af53-d3973a9ee9ef",
       "description": "count one word",
       "property": "countWords",
       "input": {
@@ -17,6 +18,7 @@
       }
     },
     {
+      "uuid": "5abd53a3-1aed-43a4-a15a-29f88c09cbbd",
       "description": "count one of each word",
       "property": "countWords",
       "input": {
@@ -29,6 +31,7 @@
       }
     },
     {
+      "uuid": "2a3091e5-952e-4099-9fac-8f85d9655c0e",
       "description": "multiple occurrences of a word",
       "property": "countWords",
       "input": {
@@ -43,6 +46,7 @@
       }
     },
     {
+      "uuid": "e81877ae-d4da-4af4-931c-d923cd621ca6",
       "description": "handles cramped lists",
       "property": "countWords",
       "input": {
@@ -55,6 +59,7 @@
       }
     },
     {
+      "uuid": "7349f682-9707-47c0-a9af-be56e1e7ff30",
       "description": "handles expanded lists",
       "property": "countWords",
       "input": {
@@ -67,6 +72,7 @@
       }
     },
     {
+      "uuid": "a514a0f2-8589-4279-8892-887f76a14c82",
       "description": "ignore punctuation",
       "property": "countWords",
       "input": {
@@ -81,6 +87,7 @@
       }
     },
     {
+      "uuid": "d2e5cee6-d2ec-497b-bdc9-3ebe092ce55e",
       "description": "include numbers",
       "property": "countWords",
       "input": {
@@ -93,6 +100,7 @@
       }
     },
     {
+      "uuid": "dac6bc6a-21ae-4954-945d-d7f716392dbf",
       "description": "normalize case",
       "property": "countWords",
       "input": {
@@ -104,6 +112,7 @@
       }
     },
     {
+      "uuid": "4185a902-bdb0-4074-864c-f416e42a0f19",
       "description": "with apostrophes",
       "property": "countWords",
       "input": {
@@ -118,6 +127,7 @@
       }
     },
     {
+      "uuid": "be72af2b-8afe-4337-b151-b297202e4a7b",
       "description": "with quotations",
       "property": "countWords",
       "input": {
@@ -133,6 +143,7 @@
       }
     },
     {
+      "uuid": "8d6815fe-8a51-4a65-96f9-2fb3f6dc6ed6",
       "description": "substrings from the beginning",
       "property": "countWords",
       "input": {
@@ -150,6 +161,7 @@
       }
     },
     {
+      "uuid": "c5f4ef26-f3f7-4725-b314-855c04fb4c13",
       "description": "multiple spaces not detected as a word",
       "property": "countWords",
       "input": {
@@ -161,6 +173,7 @@
       }
     },
     {
+      "uuid": "50176e8a-fe8e-4f4c-b6b6-aa9cf8f20360",
       "description": "alternating word separators not detected as a word",
       "property": "countWords",
       "input": {
diff --git a/exercises/word-search/canonical-data.json b/exercises/word-search/canonical-data.json
index fcd681f19e..b22dffc05d 100644
--- a/exercises/word-search/canonical-data.json
+++ b/exercises/word-search/canonical-data.json
@@ -6,6 +6,7 @@
   ],
   "cases": [
     {
+      "uuid": "b4057815-0d01-41f0-9119-6a91f54b2a0a",
       "description": "Should accept an initial game grid and a target search word",
       "property": "search",
       "input": {
@@ -21,6 +22,7 @@
       }
     },
     {
+      "uuid": "6b22bcc5-6cbf-4674-931b-d2edbff73132",
       "description": "Should locate one word written left to right",
       "property": "search",
       "input": {
@@ -45,6 +47,7 @@
       }
     },
     {
+      "uuid": "ff462410-434b-442d-9bc3-3360c75f34a8",
       "description": "Should locate the same word written left to right in a different position",
       "property": "search",
       "input": {
@@ -69,6 +72,7 @@
       }
     },
     {
+      "uuid": "a02febae-6347-443e-b99c-ab0afb0b8fca",
       "description": "Should locate a different left to right word",
       "property": "search",
       "input": {
@@ -93,6 +97,7 @@
       }
     },
     {
+      "uuid": "e42e9987-6304-4e13-8232-fa07d5280130",
       "description": "Should locate that different left to right word in a different position",
       "property": "search",
       "input": {
@@ -117,6 +122,7 @@
       }
     },
     {
+      "uuid": "9bff3cee-49b9-4775-bdfb-d55b43a70b2f",
       "description": "Should locate a left to right word in two line grid",
       "property": "search",
       "input": {
@@ -142,6 +148,7 @@
       }
     },
     {
+      "uuid": "851a35fb-f499-4ec1-9581-395a87903a22",
       "description": "Should locate a left to right word in three line grid",
       "property": "search",
       "input": {
@@ -168,6 +175,7 @@
       }
     },
     {
+      "uuid": "2f3dcf84-ba7d-4b75-8b8d-a3672b32c035",
       "description": "Should locate a left to right word in ten line grid",
       "property": "search",
       "input": {
@@ -201,6 +209,7 @@
       }
     },
     {
+      "uuid": "006d4856-f365-4e84-a18c-7d129ce9eefb",
       "description": "Should locate that left to right word in a different position in a ten line grid",
       "property": "search",
       "input": {
@@ -234,6 +243,7 @@
       }
     },
     {
+      "uuid": "eff7ac9f-ff11-443e-9747-40850c12ab60",
       "description": "Should locate a different left to right word in a ten line grid",
       "property": "search",
       "input": {
@@ -267,6 +277,7 @@
       }
     },
     {
+      "uuid": "dea39f86-8c67-4164-8884-13bfc48bd13b",
       "description": "Should locate multiple words",
       "property": "search",
       "input": {
@@ -311,6 +322,7 @@
       }
     },
     {
+      "uuid": "29e6a6a5-f80c-48a6-8e68-05bbbe187a09",
       "description": "Should locate a single word written right to left",
       "property": "search",
       "input": {
@@ -335,6 +347,7 @@
       }
     },
     {
+      "uuid": "3cf34428-b43f-48b6-b332-ea0b8836011d",
       "description": "Should locate multiple words written in different horizontal directions",
       "property": "search",
       "input": {
@@ -379,6 +392,7 @@
       }
     },
     {
+      "uuid": "2c8cd344-a02f-464b-93b6-8bf1bd890003",
       "description": "Should locate words written top to bottom",
       "property": "search",
       "input": {
@@ -434,6 +448,7 @@
       }
     },
     {
+      "uuid": "9ee1e43d-e59d-4c32-9a5f-6a22d4a1550f",
       "description": "Should locate words written bottom to top",
       "property": "search",
       "input": {
@@ -500,6 +515,7 @@
       }
     },
     {
+      "uuid": "6a21a676-f59e-4238-8e88-9f81015afae9",
       "description": "Should locate words written top left to bottom right",
       "property": "search",
       "input": {
@@ -577,6 +593,7 @@
       }
     },
     {
+      "uuid": "c9125189-1861-4b0d-a14e-ba5dab29ca7c",
       "description": "Should locate words written bottom right to top left",
       "property": "search",
       "input": {
@@ -665,6 +682,7 @@
       }
     },
     {
+      "uuid": "b19e2149-7fc5-41ec-a8a9-9bc6c6c38c40",
       "description": "Should locate words written bottom left to top right",
       "property": "search",
       "input": {
@@ -764,6 +782,7 @@
       }
     },
     {
+      "uuid": "69e1d994-a6d7-4e24-9b5a-db76751c2ef8",
       "description": "Should locate words written top right to bottom left",
       "property": "search",
       "input": {
@@ -874,6 +893,7 @@
       }
     },
     {
+      "uuid": "695531db-69eb-463f-8bad-8de3bf5ef198",
       "description": "Should fail to locate a word that is not in the puzzle",
       "property": "search",
       "input": {
@@ -986,4 +1006,4 @@
       }
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/exercises/wordy/canonical-data.json b/exercises/wordy/canonical-data.json
index 05e667ba2f..551f1aa522 100644
--- a/exercises/wordy/canonical-data.json
+++ b/exercises/wordy/canonical-data.json
@@ -8,6 +8,7 @@
   ],
   "cases": [
     {
+      "uuid": "88bf4b28-0de3-4883-93c7-db1b14aa806e",
       "description": "just a number",
       "property": "answer",
       "input": {
@@ -16,6 +17,7 @@
       "expected": 5
     },
     {
+      "uuid": "bb8c655c-cf42-4dfc-90e0-152fcfd8d4e0",
       "description": "addition",
       "property": "answer",
       "input": {
@@ -24,6 +26,7 @@
       "expected": 2
     },
     {
+      "uuid": "79e49e06-c5ae-40aa-a352-7a3a01f70015",
       "description": "more addition",
       "property": "answer",
       "input": {
@@ -32,6 +35,7 @@
       "expected": 55
     },
     {
+      "uuid": "b345dbe0-f733-44e1-863c-5ae3568f3803",
       "description": "addition with negative numbers",
       "property": "answer",
       "input": {
@@ -40,6 +44,7 @@
       "expected": -11
     },
     {
+      "uuid": "cd070f39-c4cc-45c4-97fb-1be5e5846f87",
       "description": "large addition",
       "property": "answer",
       "input": {
@@ -48,6 +53,7 @@
       "expected": 45801
     },
     {
+      "uuid": "0d86474a-cd93-4649-a4fa-f6109a011191",
       "description": "subtraction",
       "property": "answer",
       "input": {
@@ -56,6 +62,7 @@
       "expected": 16
     },
     {
+      "uuid": "30bc8395-5500-4712-a0cf-1d788a529be5",
       "description": "multiplication",
       "property": "answer",
       "input": {
@@ -64,6 +71,7 @@
       "expected": -75
     },
     {
+      "uuid": "34c36b08-8605-4217-bb57-9a01472c427f",
       "description": "division",
       "property": "answer",
       "input": {
@@ -72,6 +80,7 @@
       "expected": -11
     },
     {
+      "uuid": "da6d2ce4-fb94-4d26-8f5f-b078adad0596",
       "description": "multiple additions",
       "property": "answer",
       "input": {
@@ -80,6 +89,7 @@
       "expected": 3
     },
     {
+      "uuid": "7fd74c50-9911-4597-be09-8de7f2fea2bb",
       "description": "addition and subtraction",
       "property": "answer",
       "input": {
@@ -88,6 +98,7 @@
       "expected": 8
     },
     {
+      "uuid": "b120ffd5-bad6-4e22-81c8-5512e8faf905",
       "description": "multiple subtraction",
       "property": "answer",
       "input": {
@@ -96,6 +107,7 @@
       "expected": 3
     },
     {
+      "uuid": "4f4a5749-ef0c-4f60-841f-abcfaf05d2ae",
       "description": "subtraction then addition",
       "property": "answer",
       "input": {
@@ -104,6 +116,7 @@
       "expected": 14
     },
     {
+      "uuid": "312d908c-f68f-42c9-aa75-961623cc033f",
       "description": "multiple multiplication",
       "property": "answer",
       "input": {
@@ -112,6 +125,7 @@
       "expected": -12
     },
     {
+      "uuid": "38e33587-8940-4cc1-bc28-bfd7e3966276",
       "description": "addition and multiplication",
       "property": "answer",
       "input": {
@@ -120,6 +134,7 @@
       "expected": -8
     },
     {
+      "uuid": "3c854f97-9311-46e8-b574-92b60d17d394",
       "description": "multiple division",
       "property": "answer",
       "input": {
@@ -128,6 +143,7 @@
       "expected": 2
     },
     {
+      "uuid": "3ad3e433-8af7-41ec-aa9b-97b42ab49357",
       "description": "unknown operation",
       "property": "answer",
       "input": {
@@ -136,6 +152,7 @@
       "expected": {"error": "unknown operation"}
     },
     {
+      "uuid": "8a7e85a8-9e7b-4d46-868f-6d759f4648f8",
       "description": "Non math question",
       "property": "answer",
       "input": {
@@ -144,6 +161,7 @@
       "expected": {"error": "unknown operation"}
     },
     {
+      "uuid": "42d78b5f-dbd7-4cdb-8b30-00f794bb24cf",
       "description": "reject problem missing an operand",
       "property": "answer",
       "input": {
@@ -152,6 +170,7 @@
       "expected": {"error": "syntax error"}
     },
     {
+      "uuid": "c2c3cbfc-1a72-42f2-b597-246e617e66f5",
       "description": "reject problem with no operands or operators",
       "property": "answer",
       "input": {
@@ -160,6 +179,7 @@
       "expected": {"error": "syntax error"}
     },
     {
+      "uuid": "4b3df66d-6ed5-4c95-a0a1-d38891fbdab6",
       "description": "reject two operations in a row",
       "property": "answer",
       "input": {
@@ -168,6 +188,7 @@
       "expected": {"error": "syntax error"}
     },
     {
+      "uuid": "6abd7a50-75b4-4665-aa33-2030fd08bab1",
       "description": "reject two numbers in a row",
       "property": "answer",
       "input": {
@@ -176,6 +197,7 @@
       "expected": {"error": "syntax error"}
     },
     {
+      "uuid": "10a56c22-e0aa-405f-b1d2-c642d9c4c9de",
       "description": "reject postfix notation",
       "property": "answer",
       "input": {
@@ -184,6 +206,7 @@
       "expected": {"error": "syntax error"}
     },
     {
+      "uuid": "0035bc63-ac43-4bb5-ad6d-e8651b7d954e",
       "description": "reject prefix notation",
       "property": "answer",
       "input": {
diff --git a/exercises/yacht/canonical-data.json b/exercises/yacht/canonical-data.json
index d88598a582..2d8a7a4dbb 100644
--- a/exercises/yacht/canonical-data.json
+++ b/exercises/yacht/canonical-data.json
@@ -14,6 +14,7 @@
    ],
     "cases":[
         {
+            "uuid": "3060e4a5-4063-4deb-a380-a630b43a84b6",
             "description":"Yacht",
             "property":"score",
             "input":{
@@ -23,6 +24,7 @@
             "expected":50
         },
         {
+            "uuid": "15026df2-f567-482f-b4d5-5297d57769d9",
             "description":"Not Yacht",
             "property":"score",
             "input":{
@@ -32,6 +34,7 @@
             "expected":0
         },
         {
+            "uuid": "36b6af0c-ca06-4666-97de-5d31213957a4",
             "description":"Ones",
             "property":"score",
             "input":{
@@ -41,6 +44,7 @@
             "expected":3
         },
         {
+            "uuid": "023a07c8-6c6e-44d0-bc17-efc5e1b8205a",
             "description":"Ones, out of order",
             "property":"score",
             "input":{
@@ -50,6 +54,7 @@
             "expected":3
         },
         {
+            "uuid": "7189afac-cccd-4a74-8182-1cb1f374e496",
             "description":"No ones",
             "property":"score",
             "input":{
@@ -59,6 +64,7 @@
             "expected":0
         },
         {
+            "uuid": "793c4292-dd14-49c4-9707-6d9c56cee725",
             "description":"Twos",
             "property":"score",
             "input":{
@@ -68,6 +74,7 @@
             "expected":2
         },
         {
+            "uuid": "dc41bceb-d0c5-4634-a734-c01b4233a0c6",
             "description":"Fours",
             "property":"score",
             "input":{
@@ -77,6 +84,7 @@
             "expected":8
         },
         {
+            "uuid": "f6125417-5c8a-4bca-bc5b-b4b76d0d28c8",
             "description":"Yacht counted as threes",
             "property":"score",
             "input":{
@@ -86,6 +94,7 @@
             "expected":15
         },
         {
+            "uuid": "464fc809-96ed-46e4-acb8-d44e302e9726",
             "description":"Yacht of 3s counted as fives",
             "property":"score",
             "input":{
@@ -95,6 +104,7 @@
             "expected":0
         },
         {
+            "uuid": "e8a036e0-9d21-443a-8b5f-e15a9e19a761",
             "description":"Sixes",
             "property":"score",
             "input":{
@@ -104,6 +114,7 @@
             "expected":6
         },
         {
+            "uuid": "51cb26db-6b24-49af-a9ff-12f53b252eea",
             "description":"Full house two small, three big",
             "property":"score",
             "input":{
@@ -113,6 +124,7 @@
             "expected":16
         },
         {
+            "uuid": "1822ca9d-f235-4447-b430-2e8cfc448f0c",
             "description":"Full house three small, two big",
             "property":"score",
             "input":{
@@ -122,6 +134,7 @@
             "expected":19
         },
         {
+            "uuid": "b208a3fc-db2e-4363-a936-9e9a71e69c07",
             "description":"Two pair is not a full house",
             "property":"score",
             "input":{
@@ -131,6 +144,7 @@
             "expected":0
         },
         {
+            "uuid": "b90209c3-5956-445b-8a0b-0ac8b906b1c2",
             "description":"Four of a kind is not a full house",
             "property":"score",
             "input":{
@@ -140,6 +154,7 @@
             "expected":0
         },
         {
+            "uuid": "32a3f4ee-9142-4edf-ba70-6c0f96eb4b0c",
             "description":"Yacht is not a full house",
             "property":"score",
             "input":{
@@ -149,6 +164,7 @@
             "expected":0
         },
         {
+            "uuid": "b286084d-0568-4460-844a-ba79d71d79c6",
             "description":"Four of a Kind",
             "property":"score",
             "input":{
@@ -158,6 +174,7 @@
             "expected":24
         },
         {
+            "uuid": "f25c0c90-5397-4732-9779-b1e9b5f612ca",
             "description":"Yacht can be scored as Four of a Kind",
             "property":"score",
             "input":{
@@ -167,6 +184,7 @@
             "expected":12
         },
         {
+            "uuid": "9f8ef4f0-72bb-401a-a871-cbad39c9cb08",
             "description":"Full house is not Four of a Kind",
             "property":"score",
             "input":{
@@ -176,6 +194,7 @@
             "expected":0
         },
         {
+            "uuid": "b4743c82-1eb8-4a65-98f7-33ad126905cd",
             "description":"Little Straight",
             "property":"score",
             "input":{
@@ -185,6 +204,7 @@
             "expected":30
         },
         {
+            "uuid": "7ac08422-41bf-459c-8187-a38a12d080bc",
             "description":"Little Straight as Big Straight",
             "property":"score",
             "input":{
@@ -194,6 +214,7 @@
             "expected":0
         },
         {
+            "uuid": "97bde8f7-9058-43ea-9de7-0bc3ed6d3002",
             "description":"Four in order but not a little straight",
             "property":"score",
             "input":{
@@ -203,6 +224,7 @@
             "expected":0
         },
         {
+            "uuid": "cef35ff9-9c5e-4fd2-ae95-6e4af5e95a99",
             "description":"No pairs but not a little straight",
             "property":"score",
             "input":{
@@ -212,6 +234,7 @@
             "expected":0
         },
         {
+            "uuid": "fd785ad2-c060-4e45-81c6-ea2bbb781b9d",
             "description":"Minimum is 1, maximum is 5, but not a little straight",
             "property":"score",
             "input":{
@@ -221,6 +244,7 @@
             "expected":0
         },
         {
+            "uuid": "35bd74a6-5cf6-431a-97a3-4f713663f467",
             "description":"Big Straight",
             "property":"score",
             "input":{
@@ -230,6 +254,7 @@
             "expected":30
         },
         {
+            "uuid": "87c67e1e-3e87-4f3a-a9b1-62927822b250",
             "description":"Big Straight as little straight",
             "property":"score",
             "input":{
@@ -239,6 +264,7 @@
             "expected":0
         },
         {
+            "uuid": "c1fa0a3a-40ba-4153-a42d-32bc34d2521e",
             "description":"No pairs but not a big straight",
             "property":"score",
             "input":{
@@ -248,6 +274,7 @@
             "expected":0
         },
         {
+            "uuid": "207e7300-5d10-43e5-afdd-213e3ac8827d",
             "description":"Choice",
             "property":"score",
             "input":{
@@ -257,6 +284,7 @@
             "expected":23
         },
         {
+            "uuid": "b524c0cf-32d2-4b40-8fb3-be3500f3f135",
             "description":"Yacht as choice",
             "property":"score",
             "input":{
diff --git a/exercises/zebra-puzzle/canonical-data.json b/exercises/zebra-puzzle/canonical-data.json
index a9d067d045..0f130ce243 100644
--- a/exercises/zebra-puzzle/canonical-data.json
+++ b/exercises/zebra-puzzle/canonical-data.json
@@ -3,12 +3,14 @@
   "version": "1.1.0",
   "cases": [
     {
+      "uuid": "16efb4e4-8ad7-4d5e-ba96-e5537b66fd42",
       "description": "resident who drinks water",
       "property": "drinksWater",
       "input": {},
       "expected": "Norwegian"
     },
     {
+      "uuid": "084d5b8b-24e2-40e6-b008-c800da8cd257",
       "description": "resident who owns zebra",
       "property": "ownsZebra",
       "input": {},
diff --git a/exercises/zipper/canonical-data.json b/exercises/zipper/canonical-data.json
index 02e40f1bf5..1ebcff3012 100644
--- a/exercises/zipper/canonical-data.json
+++ b/exercises/zipper/canonical-data.json
@@ -18,6 +18,7 @@
   ],
   "cases": [
     {
+      "uuid": "771c652e-0754-4ef0-945c-0675d12ef1f5",
       "description": "data is retained",
       "property": "expectedValue",
       "input": {
@@ -66,6 +67,7 @@
       }
     },
     {
+      "uuid": "d7dcbb92-47fc-4d01-b81a-df3353bc09ff",
       "description": "left, right and value",
       "property": "expectedValue",
       "input": {
@@ -104,6 +106,7 @@
       }
     },
     {
+      "uuid": "613d8286-b05c-4453-b205-e6f9c5966339",
       "description": "dead end",
       "property": "expectedValue",
       "input": {
@@ -139,6 +142,7 @@
       }
     },
     {
+      "uuid": "dda31af7-1c68-4e29-933a-c9d198d94284",
       "description": "tree from deep focus",
       "property": "expectedValue",
       "input": {
@@ -193,6 +197,7 @@
       }
     },
     {
+      "uuid": "1e3072a6-f85b-430b-b014-cdb4087e3577",
       "description": "traversing up from top",
       "property": "expectedValue",
       "input": {
@@ -225,6 +230,7 @@
       }
     },
     {
+      "uuid": "b8505f6a-aed4-4c2e-824f-a0ed8570d74b",
       "description": "left, right, and up",
       "property": "expectedValue",
       "input": {
@@ -275,6 +281,7 @@
       }
     },
     {
+      "uuid": "47df1a27-b709-496e-b381-63a03b82ea5f",
       "description": "set_value",
       "property": "expectedValue",
       "input": {
@@ -330,6 +337,7 @@
       }
     },
     {
+      "uuid": "16a1f1a8-dbed-456d-95ac-1cbb6093e0ab",
       "description": "set_value after traversing up",
       "property": "expectedValue",
       "input": {
@@ -391,6 +399,7 @@
       }
     },
     {
+      "uuid": "535a91af-a02e-49cd-8d2c-ecb6e4647174",
       "description": "set_left with leaf",
       "property": "expectedValue",
       "input": {
@@ -454,6 +463,7 @@
       }
     },
     {
+      "uuid": "b3f60c4b-a788-4ffd-be5d-1e69aee61de3",
       "description": "set_right with null",
       "property": "expectedValue",
       "input": {
@@ -505,6 +515,7 @@
       }
     },
     {
+      "uuid": "e91c221d-7b90-4604-b4ec-46638a673a12",
       "description": "set_right with subtree",
       "property": "expectedValue",
       "input": {
@@ -577,6 +588,7 @@
       }
     },
     {
+      "uuid": "c246be85-6648-4e9c-866f-b08cd495149a",
       "description": "set_value on deep focus",
       "property": "expectedValue",
       "input": {
@@ -635,6 +647,7 @@
       }
     },
     {
+      "uuid": "47aa85a0-5240-48a4-9f42-e2ac636710ea",
       "description": "different paths to same zipper",
       "property": "sameResultFromOperations",
       "input": {