Fix serialization issues with RegExp instances in the normalized config

CHANGELOG.md

@@ -55,6 +55,7 @@
 - `[jest-runtime]` Fix transform cache invalidation when requiring a test file from multiple projects ([#7186](https://github.com/facebook/jest/pull/7186))
 - `[jest-changed-files]` Return correctly the changed files when using `lastCommit=true` on Mercurial repositories ([#7228](https://github.com/facebook/jest/pull/7228))
 - `[babel-jest]` Cache includes babel environment variables ([#7239](https://github.com/facebook/jest/pull/7239))
+- `[jest-config]` Use strings instead of `RegExp` instances in normalized configuration ([#7251](https://github.com/facebook/jest/pull/7251))
 
 ### Chore & Maintenance
 

TestUtils.js

@@ -109,7 +109,7 @@ const DEFAULT_PROJECT_CONFIG: ProjectConfig = {
   testLocationInResults: false,
   testMatch: [],
   testPathIgnorePatterns: [],
-  testRegex: [/\.test\.js$/],
+  testRegex: ['\\.test\\.js$'],
   testRunner: 'jest-jasmine2',
   testURL: '',
   timers: 'real',

e2e/__tests__/__snapshots__/coverage_report.test.js.snap

@@ -42,6 +42,23 @@ All files |    85.71 |      100 |       50 |      100 |                   |
 
 exports[`does not output coverage report when html is requested 1`] = `""`;
 
+exports[`generates coverage when using the testRegex config param  1`] = `
+"-------------------------------------|----------|----------|----------|----------|-------------------|
+File                                 |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
+-------------------------------------|----------|----------|----------|----------|-------------------|
+All files                           </> |    56.52</> |        0</> |       50</> |    55.56</> |                  </> |
+ coverage-report                    </> |    41.18</> |        0</> |       25</> |    42.86</> |                  </> |
+  OtherFile.js                      </> |      100</> |      100</> |      100</> |      100</> |                  </> |
+  Sum.js                            </> |    85.71</> |      100</> |       50</> |      100</> |                  </> |
+  SumDependency.js                  </> |        0</> |        0</> |        0</> |        0</> |           8,10,12</> |
+  notRequiredInTestSuite.js         </> |        0</> |        0</> |        0</> |        0</> |     8,15,16,17,19</> |
+ coverage-report/cached-duplicates/a</> |      100</> |      100</> |      100</> |      100</> |                  </> |
+  Identical.js                      </> |      100</> |      100</> |      100</> |      100</> |                  </> |
+ coverage-report/cached-duplicates/b</> |      100</> |      100</> |      100</> |      100</> |                  </> |
+  Identical.js                      </> |      100</> |      100</> |      100</> |      100</> |                  </> |
+-------------------------------------|----------|----------|----------|----------|-------------------|"
+`;
+
 exports[`json reporter printing with --coverage 1`] = `
 "Test Suites: 1 failed, 1 total
 Tests:       1 failed, 2 passed, 3 total

e2e/__tests__/coverage_report.test.js

@@ -185,3 +185,13 @@ test('collects coverage from duplicate files avoiding shared cache', () => {
   expect(stdout).toMatchSnapshot();
   expect(status).toBe(0);
 });
+
+test('generates coverage when using the testRegex config param ', () => {
+  const {stdout, status} = runJest(DIR, [
+    '--no-cache',
+    '--testRegex=__tests__',
+    '--coverage',
+  ]);
+  expect(stdout).toMatchSnapshot();
+  expect(status).toBe(0);
+});

packages/babel-jest/src/index.js

@@ -48,13 +48,11 @@ const createTransformer = (options: any): Transformer => {
       }
       let configJsFilePath = path.join(directory, BABELRC_JS_FILENAME);
       if (fs.existsSync(configJsFilePath)) {
-        // $FlowFixMe
         cache[directory] = JSON.stringify(require(configJsFilePath));
         break;
       }
       configJsFilePath = path.join(directory, BABEL_CONFIG_JS_FILENAME);
       if (fs.existsSync(configJsFilePath)) {
-        // $FlowFixMe
         cache[directory] = JSON.stringify(require(configJsFilePath));
         break;
       }
@@ -64,7 +62,6 @@ const createTransformer = (options: any): Transformer => {
           ? path.resolve(directory, PACKAGE_JSON)
           : resolvedJsonFilePath;
       if (fs.existsSync(packageJsonFilePath)) {
-        // $FlowFixMe
         const packageJsonFileContents = require(packageJsonFilePath);
         if (packageJsonFileContents[BABEL_CONFIG_KEY]) {
           cache[directory] = JSON.stringify(

packages/jest-cli/src/SearchSource.js

@@ -51,12 +51,12 @@ const globsToMatcher = (globs: ?Array<Glob>) => {
   return path => micromatch([path], globs, {dot: true}).length > 0;
 };
 
-const regexToMatcher = (testRegex: Array<RegExp>) => {
+const regexToMatcher = (testRegex: Array<string>) => {
   if (!testRegex.length) {
     return () => true;
   }
 
-  return path => testRegex.some(e => e.test(path));
+  return path => testRegex.some(testRegex => new RegExp(testRegex).test(path));
 };
 
 const toTests = (context, tests) =>

packages/jest-cli/src/__tests__/generateEmptyCoverage.test.js

@@ -14,7 +14,6 @@ const os = require('os');
 const {makeGlobalConfig, makeProjectConfig} = require('../../../../TestUtils');
 
 jest.mock('jest-runtime', () => {
-  // $FlowFixMe requireActual
   const realRuntime = jest.requireActual('jest-runtime');
   realRuntime.shouldInstrument = () => true;
   return realRuntime;

packages/jest-config/src/ValidConfig.js

@@ -10,7 +10,7 @@
 import type {InitialOptions} from 'types/Config';
 
 import {replacePathSepForRegex} from 'jest-regex-util';
-import {MultipleValidOptions} from 'jest-validate';
+import {multipleValidOptions} from 'jest-validate';
 import {NODE_MODULES} from './constants';
 
 const NODE_MODULES_REGEXP = replacePathSepForRegex(NODE_MODULES);
@@ -101,7 +101,7 @@ export default ({
   testMatch: ['**/__tests__/**/*.js?(x)', '**/?(*.)+(spec|test).js?(x)'],
   testNamePattern: 'test signature',
   testPathIgnorePatterns: [NODE_MODULES_REGEXP],
-  testRegex: MultipleValidOptions(
+  testRegex: multipleValidOptions(
     '(/__tests__/.*|(\\.|/)(test|spec))\\.jsx?$',
     ['/__tests__/\\.test\\.jsx?$', '/__tests__/\\.spec\\.jsx?$'],
   ),

packages/jest-config/src/__tests__/__snapshots__/normalize.test.js.snap

@@ -90,17 +90,6 @@ exports[`testMatch throws if testRegex and testMatch are both specified 1`] = `
 <red></>"
 `;
 
-exports[`testMatch throws if testRegex is provided an invalid regex string 1`] = `
-"<red><bold><bold>● <bold>Validation Error</>:</>
-<red></>
-<red>Error parsing configuration for <bold>testRegex</>: \\"foo(bar\\" could not be parsed.</>
-<red>Error: Invalid regular expression: /foo(bar/: Unterminated group</>
-<red></>
-<red>  <bold>Configuration Documentation:</></>
-<red>  https://jestjs.io/docs/configuration.html</>
-<red></>"
-`;
-
 exports[`testPathPattern <regexForTestFiles> ignores invalid regular expressions and logs a warning 1`] = `"<red>  Invalid testPattern a( supplied. Running all tests instead.</>"`;
 
 exports[`testPathPattern --testPathPattern ignores invalid regular expressions and logs a warning 1`] = `"<red>  Invalid testPattern a( supplied. Running all tests instead.</>"`;

packages/jest-config/src/__tests__/normalize.test.js

@@ -860,7 +860,7 @@ describe('testRegex', () => {
 
     expect(options.testRegex).toEqual([]);
   });
-  it('testRegex string is mapped to array of RegExp objects', () => {
+  it('testRegex string is mapped to an array', () => {
     const {options} = normalize(
       {
         rootDir: '/root',
@@ -869,9 +869,9 @@ describe('testRegex', () => {
       {},
     );
 
-    expect(options.testRegex).toEqual([/.*/]);
+    expect(options.testRegex).toEqual(['.*']);
   });
-  it('testRegex array is mapped to array of RegExp objects', () => {
+  it('testRegex array is preserved', () => {
     const {options} = normalize(
       {
         rootDir: '/root',
@@ -880,7 +880,7 @@ describe('testRegex', () => {
       {},
     );
 
-    expect(options.testRegex).toEqual([/.*/, /foo\.bar/]);
+    expect(options.testRegex).toEqual(['.*', 'foo\\.bar']);
   });
 });
 
@@ -922,18 +922,6 @@ describe('testMatch', () => {
     }).toThrowErrorMatchingSnapshot();
   });
 
-  it('throws if testRegex is provided an invalid regex string', () => {
-    expect(() => {
-      normalize(
-        {
-          rootDir: '/root',
-          testRegex: 'foo(bar',
-        },
-        {},
-      );
-    }).toThrowErrorMatchingSnapshot();
-  });
-
   it('normalizes testMatch', () => {
     const {options} = normalize(
       {

packages/jest-config/src/normalize.js

@@ -569,23 +569,9 @@ export default function normalize(options: InitialOptions, argv: Argv) {
         );
         break;
       case 'testRegex':
-        const valueOrEmptyArray = options[key] || [];
-        const valueArray = Array.isArray(valueOrEmptyArray)
-          ? valueOrEmptyArray
-          : [valueOrEmptyArray];
-
-        value = valueArray.map(replacePathSepForRegex).map(pattern => {
-          try {
-            return new RegExp(pattern);
-          } catch (err) {
-            throw createConfigError(
-              `Error parsing configuration for ${chalk.bold(
-                key,
-              )}: "${pattern}" could not be parsed.\n` +
-                `Error: ${err.message}`,
-            );
-          }
-        });
+        value = options[key]
+          ? [].concat(options[key]).map(replacePathSepForRegex)
+          : [];
         break;
       case 'moduleFileExtensions': {
         value = options[key];

packages/jest-runtime/src/__tests__/should_instrument.test.js

@@ -29,13 +29,13 @@ describe('should_instrument', () => {
 
     it('when testRegex provided and file is not a test file', () => {
       testShouldInstrument('source_file.js', defaultOptions, {
-        testRegex: [/.*\.(test)\\.(js)$'/],
+        testRegex: ['.*\\.(test)\\.(js)$'],
       });
     });
 
     it('when more than one testRegex is provided and filename is not a test file', () => {
       testShouldInstrument('source_file.js', defaultOptions, {
-        testRegex: [/.*\_(test)\.(js)$/, /.*\.(test)\.(js)$/, /never/],
+        testRegex: ['.*\\_(test)\\.(js)$', '.*\\.(test)\\.(js)$', 'never'],
       });
     });
 
@@ -121,13 +121,13 @@ describe('should_instrument', () => {
 
     it('when testRegex provided and filename is a test file', () => {
       testShouldInstrument(defaultFilename, defaultOptions, {
-        testRegex: [/.*\.(test)\.(js)$/],
+        testRegex: ['.*\\.(test)\\.(js)$'],
       });
     });
 
     it('when more than one testRegex is provided and filename matches one of the patterns', () => {
       testShouldInstrument(defaultFilename, defaultOptions, {
-        testRegex: [/.*\_(test)\.(js)$/, /.*\.(test)\.(js)$/, /never/],
+        testRegex: ['.*\\_(test)\\.(js)$', '.*\\.(test)\\.(js)$', 'never'],
       });
     });
 

packages/jest-runtime/src/should_instrument.js

@@ -37,7 +37,7 @@ export default function shouldInstrument(
 
   if (
     config.testRegex &&
-    config.testRegex.some(regex => regex.test(filename))
+    config.testRegex.some(testRegex => new RegExp(testRegex).test(filename))
   ) {
     return false;
   }

packages/jest-validate/README.md

@@ -141,11 +141,11 @@ This will output:
 ## Example validating multiple types
 
 ```js
-import {MultipleValidOptions} from 'jest-validate';
+import {multipleValidOptions} from 'jest-validate';
 
 validate(config, {
   // `bar` will accept either a string or a number
-  bar: MultipleValidOptions('string is ok', 2),
+  bar: multipleValidOptions('string is ok', 2),
 });
 ```
 

packages/jest-validate/src/__tests__/validate.test.js

@@ -9,7 +9,7 @@
 'use strict';
 
 import validate from '../validate';
-import {MultipleValidOptions} from '../condition';
+import {multipleValidOptions} from '../condition';
 import jestValidateExampleConfig from '../example_config';
 import jestValidateDefaultConfig from '../default_config';
 
@@ -210,7 +210,7 @@ test('works with custom deprecations', () => {
 
 test('works with multiple valid types', () => {
   const exampleConfig = {
-    foo: MultipleValidOptions('text', ['text']),
+    foo: multipleValidOptions('text', ['text']),
   };
 
   expect(
@@ -239,7 +239,7 @@ test('works with multiple valid types', () => {
 
 test('reports errors nicely when failing with multiple valid options', () => {
   const exampleConfig = {
-    foo: MultipleValidOptions('text', ['text']),
+    foo: multipleValidOptions('text', ['text']),
   };
 
   expect(() =>
@@ -254,7 +254,7 @@ test('reports errors nicely when failing with multiple valid options', () => {
 
 test('Repeated types within multiple valid examples are coalesced in error report', () => {
   const exampleConfig = {
-    foo: MultipleValidOptions('foo', 'bar', 2),
+    foo: multipleValidOptions('foo', 'bar', 2),
   };
 
   expect(() =>

packages/jest-validate/src/condition.js

@@ -9,7 +9,7 @@
 
 const toString = Object.prototype.toString;
 
-const MultipleValidOptionsSymbol = Symbol('JEST_MULTIPLE_VALID_OPTIONS');
+const MULTIPLE_VALID_OPTIONS_SYMBOL = Symbol('JEST_MULTIPLE_VALID_OPTIONS');
 
 function validationConditionSingle(option: any, validOption: any): boolean {
   return (
@@ -22,10 +22,9 @@ function validationConditionSingle(option: any, validOption: any): boolean {
 export function getValues(validOption: any) {
   if (
     Array.isArray(validOption) &&
-    validOption.length &&
-    validOption[0] === MultipleValidOptionsSymbol
+    validOption[MULTIPLE_VALID_OPTIONS_SYMBOL]
   ) {
-    return validOption.slice(1);
+    return validOption;
   }
   return [validOption];
 }
@@ -34,6 +33,9 @@ export function validationCondition(option: any, validOption: any): boolean {
   return getValues(validOption).some(e => validationConditionSingle(option, e));
 }
 
-export function MultipleValidOptions(...args: Array<any>) {
-  return [MultipleValidOptionsSymbol, ...args];
+export function multipleValidOptions(...args: Array<any>) {
+  const options = [...args];
+  // $FlowFixMe
+  options[MULTIPLE_VALID_OPTIONS_SYMBOL] = true;
+  return options;
 }

packages/jest-validate/src/index.js

@@ -15,14 +15,14 @@ import {
 } from './utils';
 import validate from './validate';
 import validateCLIOptions from './validate_cli_options';
-import {MultipleValidOptions} from './condition';
+import {multipleValidOptions} from './condition';
 
 module.exports = {
-  MultipleValidOptions,
   ValidationError,
   createDidYouMeanMessage,
   format,
   logValidationWarning,
+  multipleValidOptions,
   validate,
   validateCLIOptions,
 };

types/Config.js

@@ -74,7 +74,7 @@ export type DefaultOptions = {|
   testLocationInResults: boolean,
   testMatch: Array<Glob>,
   testPathIgnorePatterns: Array<string>,
-  testRegex: Array<RegExp>,
+  testRegex: Array<string>,
   testResultsProcessor: ?string,
   testRunner: ?string,
   testURL: string,
@@ -166,7 +166,7 @@ export type InitialOptions = {
   testNamePattern?: string,
   testPathDirs?: Array<Path>,
   testPathIgnorePatterns?: Array<string>,
-  testRegex?: string | Array<any>,
+  testRegex?: string | Array<string>,
   testResultsProcessor?: ?string,
   testRunner?: string,
   testURL?: string,
@@ -283,7 +283,7 @@ export type ProjectConfig = {|
   testMatch: Array<Glob>,
   testLocationInResults: boolean,
   testPathIgnorePatterns: Array<string>,
-  testRegex: Array<RegExp>,
+  testRegex: Array<string>,
   testRunner: string,
   testURL: string,
   timers: 'real' | 'fake',