feat(testing): added --showConfig CLI option to Jest package (#2968)

docs/angular/api-jest/builders/jest.md

@@ -136,6 +136,12 @@ Type: `string`
 
 The name of a setup file used by Jest. (https://jestjs.io/docs/en/configuration#setupfilesafterenv-array)
 
+### showConfig
+
+Type: `boolean`
+
+Print your Jest config and then exits. (https://jestjs.io/docs/en/cli#--showconfig)
+
 ### silent
 
 Type: `boolean`

docs/react/api-jest/builders/jest.md

@@ -137,6 +137,12 @@ Type: `string`
 
 The name of a setup file used by Jest. (https://jestjs.io/docs/en/configuration#setupfilesafterenv-array)
 
+### showConfig
+
+Type: `boolean`
+
+Print your Jest config and then exits. (https://jestjs.io/docs/en/cli#--showconfig)
+
 ### silent
 
 Type: `boolean`

packages/jest/src/builders/jest/jest.impl.spec.ts

@@ -182,6 +182,7 @@ describe('Jest Builder', () => {
         onlyChanged: true,
         outputFile: 'abc.txt',
         passWithNoTests: true,
+        showConfig: true,
         silent: true,
         testNamePattern: 'test',
         testPathPattern: ['/test/path'],
@@ -225,6 +226,7 @@ describe('Jest Builder', () => {
           onlyChanged: true,
           outputFile: 'abc.txt',
           passWithNoTests: true,
+          showConfig: true,
           silent: true,
           testNamePattern: 'test',
           testPathPattern: ['/test/path'],

packages/jest/src/builders/jest/jest.impl.ts

@@ -81,6 +81,7 @@ function run(
     outputFile: options.outputFile,
     passWithNoTests: options.passWithNoTests,
     runInBand: options.runInBand,
+    showConfig: options.showConfig,
     silent: options.silent,
     testLocationInResults: options.testLocationInResults,
     testNamePattern: options.testNamePattern,

packages/jest/src/builders/jest/schema.d.ts

@@ -19,6 +19,7 @@ export interface JestBuilderOptions extends JsonObject {
   outputFile?: string;
   passWithNoTests?: boolean;
   runInBand?: boolean;
+  showConfig?: boolean;
   silent?: boolean;
   testNamePattern?: string;
   testPathPattern?: string[];

packages/jest/src/builders/jest/schema.json

@@ -80,6 +80,10 @@
       "description": "Run all tests serially in the current process (rather than creating a worker pool of child processes that run tests). This is sometimes useful for debugging, but such use cases are pretty rare. Useful for CI. (https://jestjs.io/docs/en/cli#runinband)",
       "type": "boolean"
     },
+    "showConfig": {
+      "description": "Print your Jest config and then exits. (https://jestjs.io/docs/en/cli#--showconfig)",
+      "type": "boolean"
+    },
     "silent": {
       "description": "Prevent tests from printing messages through the console. (https://jestjs.io/docs/en/cli#silent)",
       "type": "boolean"