--onlyChanged tests (jestjs#3977)

integration_tests/__tests__/only_changed.test.js

@@ -0,0 +1,75 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+'use strict';
+
+import runJest from '../runJest';
+import {cleanup, run, writeFiles} from '../utils';
+import os from 'os';
+import path from 'path';
+
+const skipOnWindows = require('skipOnWindows');
+const DIR = path.resolve(os.tmpdir(), 'jest_only_changed');
+const GIT = 'git -c user.name=jest_test -c [email protected]';
+
+skipOnWindows.suite();
+
+beforeEach(() => cleanup(DIR));
+afterEach(() => cleanup(DIR));
+
+test('run only changed files', () => {
+  writeFiles(DIR, {
+    '.watchmanconfig': '',
+    '__tests__/file1.test.js': `require('../file1'); test('file1', () => {});`,
+    'file1.js': 'module.exports = {}',
+    'package.json': '{}',
+  });
+  let stderr;
+  let stdout;
+
+  ({stdout} = runJest(DIR, ['-o']));
+  expect(stdout).toMatch(/Jest can only find uncommitted changed files/);
+
+  run(`${GIT} init`, DIR);
+  run(`${GIT} add .`, DIR);
+  run(`${GIT} commit -m "first"`, DIR);
+
+  ({stdout} = runJest(DIR, ['-o']));
+  expect(stdout).toMatch('No tests found related to files');
+
+  ({stderr} = runJest(DIR, ['-o', '--lastCommit']));
+  expect(stderr).toMatch('PASS  __tests__/file1.test.js');
+
+  writeFiles(DIR, {
+    '__tests__/file2.test.js': `require('../file2'); test('file2', () => {});`,
+    '__tests__/file3.test.js': `require('../file3'); test('file3', () => {});`,
+    'file2.js': 'module.exports = {}',
+    'file3.js': `require('./file2')`,
+  });
+
+  ({stderr} = runJest(DIR, ['-o']));
+
+  expect(stderr).not.toMatch('PASS  __tests__/file1.test.js');
+  expect(stderr).toMatch('PASS  __tests__/file2.test.js');
+  expect(stderr).toMatch('PASS  __tests__/file3.test.js');
+
+  run(`${GIT} add .`, DIR);
+  run(`${GIT} commit -m "second"`, DIR);
+
+  ({stderr} = runJest(DIR, ['-o']));
+  expect(stdout).toMatch('No tests found related to files');
+
+  writeFiles(DIR, {
+    'file2.js': 'module.exports = {modified: true}',
+  });
+
+  ({stderr} = runJest(DIR, ['-o']));
+  expect(stderr).not.toMatch('PASS  __tests__/file1.test.js');
+  expect(stderr).toMatch('PASS  __tests__/file2.test.js');
+  expect(stderr).toMatch('PASS  __tests__/file3.test.js');
+});