Pretty-print asymmetric matchers

packages/jest-diff/src/index.js

@@ -14,6 +14,7 @@ import type {DiffOptions} from './diffStrings';
 
 const ReactElementPlugin = require('pretty-format/build/plugins/ReactElement');
 const ReactTestComponentPlugin = require('pretty-format/build/plugins/ReactTestComponent');
+const AsymmetricMatcherPlugin = require('pretty-format/build/plugins/AsymmetricMatcher');
 
 const chalk = require('chalk');
 const diffStrings = require('./diffStrings');
@@ -25,7 +26,11 @@ const {
   SIMILAR_MESSAGE,
 } = require('./constants');
 
-const PLUGINS = [ReactTestComponentPlugin, ReactElementPlugin];
+const PLUGINS = [
+  ReactTestComponentPlugin,
+  ReactElementPlugin,
+  AsymmetricMatcherPlugin,
+];
 const FORMAT_OPTIONS = {
   plugins: PLUGINS,
 };

packages/jest-matcher-utils/src/index.js

@@ -12,6 +12,9 @@
 
 const chalk = require('chalk');
 const prettyFormat = require('pretty-format');
+const AsymmetricMatcherPlugin = require('pretty-format/build/plugins/AsymmetricMatcher');
+
+const PLUGINS = [AsymmetricMatcherPlugin];
 
 export type ValueType =
   | 'array'
@@ -71,6 +74,8 @@ const getType = (value: any): ValueType => {
       return 'map';
     } else if (value.constructor === Set) {
       return 'set';
+    } else if (value.toString() === 'ArrayContaining') {
+      return 'array';
     }
     return 'object';
   // $FlowFixMe https://github.com/facebook/flow/issues/1015
@@ -89,12 +94,14 @@ const stringify = (object: any, maxDepth?: number = 10): string => {
     result = prettyFormat(object, {
       maxDepth,
       min: true,
+      plugins: PLUGINS,
     });
   } catch (e) {
     result = prettyFormat(object, {
       callToJSON: false,
       maxDepth,
       min: true,
+      plugins: PLUGINS,
     });
   }
 

packages/jest-matchers/src/__tests__/__snapshots__/matchers-test.js.snap

@@ -183,7 +183,7 @@ exports[`.toBeCloseTo() accepts an optional precision argument: [0, 0.000004, 5]
 
 Expected value not to be close to (with 5-digit precision):
   0.000004
-Received: 
+Received:
   0"
 `;
 
@@ -192,7 +192,7 @@ exports[`.toBeCloseTo() accepts an optional precision argument: [0, 0.0001, 3] 1
 
 Expected value not to be close to (with 3-digit precision):
   0.0001
-Received: 
+Received:
   0"
 `;
 
@@ -201,7 +201,7 @@ exports[`.toBeCloseTo() accepts an optional precision argument: [0, 0.1, 0] 1`]
 
 Expected value not to be close to (with 0-digit precision):
   0.1
-Received: 
+Received:
   0"
 `;
 
@@ -210,7 +210,7 @@ exports[`.toBeCloseTo() passes: [0, 0.001] 1`] = `
 
 Expected value not to be close to (with 2-digit precision):
   0.001
-Received: 
+Received:
   0"
 `;
 
@@ -219,7 +219,7 @@ exports[`.toBeCloseTo() passes: [0, 0] 1`] = `
 
 Expected value not to be close to (with 2-digit precision):
   0
-Received: 
+Received:
   0"
 `;
 
@@ -228,7 +228,7 @@ exports[`.toBeCloseTo() passes: [1.23, 1.225] 1`] = `
 
 Expected value not to be close to (with 2-digit precision):
   1.225
-Received: 
+Received:
   1.23"
 `;
 
@@ -237,7 +237,7 @@ exports[`.toBeCloseTo() passes: [1.23, 1.226] 1`] = `
 
 Expected value not to be close to (with 2-digit precision):
   1.226
-Received: 
+Received:
   1.23"
 `;
 
@@ -246,7 +246,7 @@ exports[`.toBeCloseTo() passes: [1.23, 1.229] 1`] = `
 
 Expected value not to be close to (with 2-digit precision):
   1.229
-Received: 
+Received:
   1.23"
 `;
 
@@ -255,7 +255,7 @@ exports[`.toBeCloseTo() passes: [1.23, 1.234] 1`] = `
 
 Expected value not to be close to (with 2-digit precision):
   1.234
-Received: 
+Received:
   1.23"
 `;
 
@@ -264,7 +264,7 @@ exports[`.toBeCloseTo() throws: [0, 0.01] 1`] = `
 
 Expected value to be close to (with 2-digit precision):
   0.01
-Received: 
+Received:
   0"
 `;
 
@@ -273,7 +273,7 @@ exports[`.toBeCloseTo() throws: [1, 1.23] 1`] = `
 
 Expected value to be close to (with 2-digit precision):
   1.23
-Received: 
+Received:
   1"
 `;
 
@@ -282,7 +282,7 @@ exports[`.toBeCloseTo() throws: [1.23, 1.2249999] 1`] = `
 
 Expected value to be close to (with 2-digit precision):
   1.2249999
-Received: 
+Received:
   1.23"
 `;
 
@@ -1742,20 +1742,20 @@ Received:
   \"abc\""
 `;
 
-exports[`.toEqual() expect("abcd").not.toEqual({"regexp": /bc/}) 1`] = `
+exports[`.toEqual() expect("abcd").not.toEqual(StringMatching /bc/) 1`] = `
 "expect(received).not.toEqual(expected)
 
 Expected value to not equal:
-  {\"regexp\": /bc/}
+  StringMatching /bc/
 Received:
   \"abcd\""
 `;
 
-exports[`.toEqual() expect("abd").toEqual({"regexp": /bc/i}) 1`] = `
+exports[`.toEqual() expect("abd").toEqual(StringMatching /bc/i) 1`] = `
 "expect(received).toEqual(expected)
 
 Expected value to equal:
-  {\"regexp\": /bc/i}
+  StringMatching /bc/i
 Received:
   \"abd\"
 
@@ -1773,60 +1773,68 @@ Received:
   \"banana\""
 `;
 
-exports[`.toEqual() expect([1, 2, 3]).not.toEqual({"sample": [2, 3]}) 1`] = `
+exports[`.toEqual() expect([1, 2, 3]).not.toEqual(ArrayContaining [2, 3]) 1`] = `
 "expect(received).not.toEqual(expected)
 
 Expected value to not equal:
-  {\"sample\": [2, 3]}
+  ArrayContaining [2, 3]
 Received:
   [1, 2, 3]"
 `;
 
-exports[`.toEqual() expect([1, 3]).toEqual({"sample": [1, 2]}) 1`] = `
+exports[`.toEqual() expect([1, 3]).toEqual(ArrayContaining [1, 2]) 1`] = `
 "expect(received).toEqual(expected)
 
 Expected value to equal:
-  {\"sample\": [1, 2]}
+  ArrayContaining [1, 2]
 Received:
   [1, 3]
 
 Difference:
 
-  Comparing two different types of values. Expected object but received array."
+- Expected
++ Received
+
+-ArrayContaining [
++Array [
+   1,
+-  2,
++  3,
+ ]"
 `;
 
-exports[`.toEqual() expect([Function anonymous]).not.toEqual({"expectedObject": [Function Function]}) 1`] = `
+exports[`.toEqual() expect([Function anonymous]).not.toEqual(Any<Function>) 1`] = `
 "expect(received).not.toEqual(expected)
 
 Expected value to not equal:
-  {\"expectedObject\": [Function Function]}
+  Any<Function>
 Received:
   [Function anonymous]"
 `;
 
-exports[`.toEqual() expect({"a": 1, "b": [Function b], "c": true}).not.toEqual({"a": 1, "b": {"expectedObject": [Function Function]}, "c": {}}) 1`] = `
+exports[`.toEqual() expect({"a": 1, "b": [Function b], "c": true}).not.toEqual({"a": 1, "b": Any<Function>, "c": Anything}) 1`] = `
 "expect(received).not.toEqual(expected)
 
 Expected value to not equal:
-  {\"a\": 1, \"b\": {\"expectedObject\": [Function Function]}, \"c\": {}}
+  {\"a\": 1, \"b\": Any<Function>, \"c\": Anything}
 Received:
   {\"a\": 1, \"b\": [Function b], \"c\": true}"
 `;
 
-exports[`.toEqual() expect({"a": 1, "b": 2}).not.toEqual({"sample": {"a": 1}}) 1`] = `
+exports[`.toEqual() expect({"a": 1, "b": 2}).not.toEqual(ObjectContaining {"a": 1}) 1`] = `
 "expect(received).not.toEqual(expected)
 
 Expected value to not equal:
-  {\"sample\": {\"a\": 1}}
+  ObjectContaining {\"a\": 1}
 Received:
   {\"a\": 1, \"b\": 2}"
 `;
 
-exports[`.toEqual() expect({"a": 1, "b": 2}).toEqual({"sample": {"a": 2}}) 1`] = `
+exports[`.toEqual() expect({"a": 1, "b": 2}).toEqual(ObjectContaining {"a": 2}) 1`] = `
 "expect(received).toEqual(expected)
 
 Expected value to equal:
-  {\"sample\": {\"a\": 2}}
+  ObjectContaining {\"a\": 2}
 Received:
   {\"a\": 1, \"b\": 2}
 
@@ -1836,9 +1844,7 @@ Difference:
 + Received
 
 -ObjectContaining {
--  \"sample\": Object {
--    \"a\": 2,
--  },
+-  \"a\": 2,
 +Object {
 +  \"a\": 1,
 +  \"b\": 2,
@@ -1904,11 +1910,11 @@ Difference:
   Comparing two different types of values. Expected undefined but received null."
 `;
 
-exports[`.toEqual() expect(true).not.toEqual({}) 1`] = `
+exports[`.toEqual() expect(true).not.toEqual(Anything) 1`] = `
 "expect(received).not.toEqual(expected)
 
 Expected value to not equal:
-  {}
+  Anything
 Received:
   true"
 `;
@@ -1931,11 +1937,11 @@ Received:
   true"
 `;
 
-exports[`.toEqual() expect(undefined).toEqual({"expectedObject": [Function Function]}) 1`] = `
+exports[`.toEqual() expect(undefined).toEqual(Any<Function>) 1`] = `
 "expect(received).toEqual(expected)
 
 Expected value to equal:
-  {\"expectedObject\": [Function Function]}
+  Any<Function>
 Received:
   undefined
 
@@ -1944,11 +1950,11 @@ Difference:
   Comparing two different types of values. Expected object but received undefined."
 `;
 
-exports[`.toEqual() expect(undefined).toEqual({}) 1`] = `
+exports[`.toEqual() expect(undefined).toEqual(Anything) 1`] = `
 "expect(received).toEqual(expected)
 
 Expected value to equal:
-  {}
+  Anything
 Received:
   undefined