feat: Add GitHub Actions Reporter

CHANGELOG.md

@@ -30,6 +30,7 @@
 - `[jest-mock]` [**BREAKING**] Improve the usage of `jest.fn` generic type argument ([#12489](https://github.com/facebook/jest/pull/12489))
 - `[jest-mock]` Add support for auto-mocking async generator functions ([#11080](https://github.com/facebook/jest/pull/11080))
 - `[jest-mock]` Add `contexts` member to mock functions ([#12601](https://github.com/facebook/jest/pull/12601))
+- `[jest-reporters]` Add GitHub Actions reporter ([#11320](https://github.com/facebook/jest/pull/11320))
 - `[jest-resolve]` [**BREAKING**] Add support for `package.json` `exports` ([#11961](https://github.com/facebook/jest/pull/11961), [#12373](https://github.com/facebook/jest/pull/12373))
 - `[jest-resolve, jest-runtime]` Add support for `data:` URI import and mock ([#12392](https://github.com/facebook/jest/pull/12392))
 - `[jest-resolve, jest-runtime]` Add support for async resolver ([#11540](https://github.com/facebook/jest/pull/11540))

packages/jest-reporters/src/GitHubActionsReporter.ts

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import stripAnsi = require('strip-ansi');
+import type {AggregatedResult, TestResult} from '@jest/test-result';
+import BaseReporter from './BaseReporter';
+import type {Context} from './types';
+
+const lineAndColumnInStackTrace = /^.*?:([0-9]+):([0-9]+).*$/;
+
+function replaceEntities(s: string): string {
+  // https://github.com/actions/toolkit/blob/b4639928698a6bfe1c4bdae4b2bfdad1cb75016d/packages/core/src/command.ts#L80-L85
+  const substitutions: Array<[RegExp, string]> = [
+    [/%/g, '%25'],
+    [/\r/g, '%0D'],
+    [/\n/g, '%0A'],
+  ];
+  return substitutions.reduce((acc, sub) => acc.replace(...sub), s);
+}
+
+export default class GitHubActionsReporter extends BaseReporter {
+  onRunComplete(
+    _contexts?: Set<Context>,
+    aggregatedResults?: AggregatedResult,
+  ): void {
+    const messages = getMessages(aggregatedResults?.testResults);
+
+    for (const message of messages) {
+      this.log(message);
+    }
+  }
+}
+
+function getMessages(results: Array<TestResult> | undefined) {
+  if (!results) return [];
+
+  return results.flatMap(({testFilePath, testResults}) =>
+    testResults
+      .filter(r => r.status === 'failed')
+      .flatMap(r => r.failureMessages)
+      .map(m => stripAnsi(m))
+      .map(m => replaceEntities(m))
+      .map(m => lineAndColumnInStackTrace.exec(m))
+      .filter((m): m is RegExpExecArray => m !== null)
+      .map(
+        ([message, line, col]) =>
+          `::error file=${testFilePath},line=${line},col=${col}::${message}`,
+      ),
+  );
+}

packages/jest-reporters/src/__tests__/GitHubActionsReporter.test.js

@@ -0,0 +1,118 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+let GitHubActionsReporter;
+
+const write = process.stderr.write;
+const globalConfig = {
+  rootDir: 'root',
+  watch: false,
+};
+
+let results = [];
+
+function requireReporter() {
+  jest.isolateModules(() => {
+    GitHubActionsReporter = require('../GitHubActionsReporter').default;
+  });
+}
+
+beforeEach(() => {
+  process.stderr.write = result => results.push(result);
+});
+
+afterEach(() => {
+  results = [];
+  process.stderr.write = write;
+});
+
+const aggregatedResults = {
+  numFailedTestSuites: 1,
+  numFailedTests: 1,
+  numPassedTestSuites: 0,
+  numTotalTestSuites: 1,
+  numTotalTests: 1,
+  snapshot: {
+    added: 0,
+    didUpdate: false,
+    failure: false,
+    filesAdded: 0,
+    filesRemoved: 0,
+    filesRemovedList: [],
+    filesUnmatched: 0,
+    filesUpdated: 0,
+    matched: 0,
+    total: 0,
+    unchecked: 0,
+    uncheckedKeysByFile: [],
+    unmatched: 0,
+    updated: 0,
+  },
+  startTime: 0,
+  success: false,
+  testResults: [
+    {
+      numFailingTests: 1,
+      numPassingTests: 0,
+      numPendingTests: 0,
+      numTodoTests: 0,
+      openHandles: [],
+      perfStats: {
+        end: 1234,
+        runtime: 1234,
+        slow: false,
+        start: 0,
+      },
+      skipped: false,
+      snapshot: {
+        added: 0,
+        fileDeleted: false,
+        matched: 0,
+        unchecked: 0,
+        uncheckedKeys: [],
+        unmatched: 0,
+        updated: 0,
+      },
+      testFilePath: '/home/runner/work/jest/jest/some.test.js',
+      testResults: [
+        {
+          ancestorTitles: [Array],
+          duration: 7,
+          failureDetails: [Array],
+          failureMessages: [
+            `
+              Error: \u001b[2mexpect(\u001b[22m\u001b[31mreceived\u001b[39m\u001b[2m).\u001b[22mtoBe\u001b[2m(\u001b[22m\u001b[32mexpected\u001b[39m\u001b[2m) // Object.is equality\u001b[22m\n
+              \n
+              Expected: \u001b[32m\"b\"\u001b[39m\n
+              Received: \u001b[31m\"a\"\u001b[39m\n
+                  at Object.<anonymous> (/home/runner/work/jest/jest/some.test.js:4:17)\n
+                  at Object.asyncJestTest (/home/runner/work/jest/jest/node_modules/jest-jasmine2/build/jasmineAsyncInstall.js:106:37)\n
+                  at /home/runner/work/jest/jest/node_modules/jest-jasmine2/build/queueRunner.js:45:12\n
+                  at new Promise (<anonymous>)\n
+                  at mapper (/home/runner/work/jest/jest/node_modules/jest-jasmine2/build/queueRunner.js:28:19)\n
+                  at /home/runner/work/jest/jest/node_modules/jest-jasmine2/build/queueRunner.js:75:41\n
+                  at processTicksAndRejections (internal/process/task_queues.js:93:5)
+            `,
+          ],
+          fullName: 'asserts that a === b',
+          location: null,
+          numPassingAsserts: 0,
+          status: 'failed',
+          title: 'asserts that a === b',
+        },
+      ],
+    },
+  ],
+};
+
+test('reporter extracts the correct filename, line, and column', () => {
+  requireReporter();
+  const testReporter = new GitHubActionsReporter(globalConfig);
+  testReporter.onRunComplete(new Set(), aggregatedResults);
+  expect(results.join('').replace(/\\/g, '/')).toMatchSnapshot();
+});

packages/jest-reporters/src/__tests__/__snapshots__/GitHubActionsReporter.test.js.snap

@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`reporter extracts the correct filename, line, and column 1`] = `
+"::error file=/home/runner/work/jest/jest/some.test.js,line=4,col=17::%0A              Error: expect(received).toBe(expected) // Object.is equality%0A%0A              %0A%0A              Expected: "b"%0A%0A              Received: "a"%0A%0A                  at Object.<anonymous> (/home/runner/work/jest/jest/some.test.js:4:17)%0A%0A                  at Object.asyncJestTest (/home/runner/work/jest/jest/node_modules/jest-jasmine2/build/jasmineAsyncInstall.js:106:37)%0A%0A                  at /home/runner/work/jest/jest/node_modules/jest-jasmine2/build/queueRunner.js:45:12%0A%0A                  at new Promise (<anonymous>)%0A%0A                  at mapper (/home/runner/work/jest/jest/node_modules/jest-jasmine2/build/queueRunner.js:28:19)%0A%0A                  at /home/runner/work/jest/jest/node_modules/jest-jasmine2/build/queueRunner.js:75:41%0A%0A                  at processTicksAndRejections (internal/process/task_queues.js:93:5)%0A            
+"
+`;

packages/jest-reporters/src/index.ts

@@ -26,6 +26,7 @@ export {default as DefaultReporter} from './DefaultReporter';
 export {default as NotifyReporter} from './NotifyReporter';
 export {default as SummaryReporter} from './SummaryReporter';
 export {default as VerboseReporter} from './VerboseReporter';
+export {default as GitHubActionsReporter} from './GitHubActionsReporter';
 export type {
   Context,
   Reporter,