From 8cbc5b4a3b7b4295a71fdaf9cc5c96b1ab33cb50 Mon Sep 17 00:00:00 2001
From: Jason Jean <jasonjean1993@gmail.com>
Date: Tue, 11 Sep 2018 12:23:31 -0400
Subject: [PATCH] feat(builders): add runInBand and maxWorkers options to jest

---
 packages/builders/src/jest/jest.builder.spec.ts |  8 ++++++--
 packages/builders/src/jest/jest.builder.ts      |  7 +++++++
 packages/builders/src/jest/schema.json          | 10 ++++++++++
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/packages/builders/src/jest/jest.builder.spec.ts b/packages/builders/src/jest/jest.builder.spec.ts
index 8fdaa5fdf7eb41..e5ccbd047ca8c1 100644
--- a/packages/builders/src/jest/jest.builder.spec.ts
+++ b/packages/builders/src/jest/jest.builder.spec.ts
@@ -67,7 +67,9 @@ describe('Jest Builder', () => {
           ci: true,
           updateSnapshot: true,
           onlyChanged: true,
-          passWithNoTests: true
+          passWithNoTests: true,
+          runInBand: true,
+          maxWorkers: 2
         }
       })
       .toPromise();
@@ -84,7 +86,9 @@ describe('Jest Builder', () => {
         ci: true,
         updateSnapshot: true,
         onlyChanged: true,
-        passWithNoTests: true
+        passWithNoTests: true,
+        runInBand: true,
+        maxWorkers: 2
       },
       ['./jest.config.js']
     );
diff --git a/packages/builders/src/jest/jest.builder.ts b/packages/builders/src/jest/jest.builder.ts
index 24f60f35e1591f..10f4ec5c8c5553 100644
--- a/packages/builders/src/jest/jest.builder.ts
+++ b/packages/builders/src/jest/jest.builder.ts
@@ -18,7 +18,9 @@ export interface JestBuilderOptions {
   ci?: boolean;
   codeCoverage?: boolean;
   onlyChanged?: boolean;
+  maxWorkers?: number;
   passWithNoTests?: boolean;
+  runInBand?: boolean;
   setupFile?: string;
   updateSnapshot?: boolean;
 }
@@ -35,6 +37,7 @@ export default class JestBuilder implements Builder<JestBuilderOptions> {
       updateSnapshot: options.updateSnapshot,
       onlyChanged: options.onlyChanged,
       passWithNoTests: options.passWithNoTests,
+      runInBand: options.runInBand,
       globals: JSON.stringify({
         'ts-jest': {
           tsConfigFile: path.relative(builderConfig.root, options.tsConfig)
@@ -43,6 +46,10 @@ export default class JestBuilder implements Builder<JestBuilderOptions> {
       })
     };
 
+    if (options.maxWorkers) {
+      config.maxWorkers = options.maxWorkers;
+    }
+
     if (options.setupFile) {
       config.setupTestFrameworkScriptFile = path.join(
         '<rootDir>',
diff --git a/packages/builders/src/jest/schema.json b/packages/builders/src/jest/schema.json
index 35bd8e1581d541..9e91dcb676f0cd 100644
--- a/packages/builders/src/jest/schema.json
+++ b/packages/builders/src/jest/schema.json
@@ -49,6 +49,16 @@
       "type": "boolean",
       "description":
         "Fail on missing snapshots. (https://jestjs.io/docs/en/cli#ci)"
+    },
+    "runInBand": {
+      "type": "boolean",
+      "description":
+        "Run tests in a single process as opposed to multiple workers. Useful for CI. (https://jestjs.io/docs/en/cli.html#runinband)"
+    },
+    "maxWorkers": {
+      "type": "number",
+      "description":
+        "Max number of workers to run tests across. Useful for CI. (https://jestjs.io/docs/en/cli.html#maxworkers-num)"
     }
   },
   "required": ["jestConfig", "tsConfig"]