refactor(e2e): consolidate all end-to-end tests of fake timers (#12595)

e2e/__tests__/fakeTimers.test.ts

@@ -0,0 +1,48 @@
+/**
+ * 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 runJest from '../runJest';
+
+describe('enableGlobally', () => {
+  test('enables fake timers from Jest config', () => {
+    const result = runJest('fake-timers/enable-globally');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('useFakeTimers', () => {
+  test('enables fake timers from Jest object', () => {
+    const result = runJest('fake-timers/use-fake-timers');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('requestAnimationFrame', () => {
+  test('fakes requestAnimationFrame', () => {
+    const result = runJest('fake-timers/request-animation-frame');
+
+    expect(result.stderr).toMatch('requestAnimationFrame test');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('setImmediate', () => {
+  test('fakes setImmediate', () => {
+    const result = runJest('fake-timers/set-immediate');
+
+    expect(result.stderr).toMatch('setImmediate test');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('useRealTimers', () => {
+  test('restores timers to the native implementation', () => {
+    const result = runJest('fake-timers/use-real-timers');
+    expect(result.stdout).toMatch('API is not mocked with fake timers.');
+    expect(result.exitCode).toBe(0);
+  });
+});

e2e/__tests__/fakeTimersLegacy.test.ts

@@ -0,0 +1,60 @@
+/**
+ * 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 runJest from '../runJest';
+
+describe('enableGlobally', () => {
+  test('enables fake timers from Jest config', () => {
+    const result = runJest('fake-timers-legacy/enable-globally');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('useFakeTimers', () => {
+  test('enables fake timers from Jest object', () => {
+    const result = runJest('fake-timers-legacy/use-fake-timers');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('requestAnimationFrame', () => {
+  test('fakes requestAnimationFrame', () => {
+    const result = runJest('fake-timers-legacy/request-animation-frame');
+
+    expect(result.stderr).toMatch('requestAnimationFrame test');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('setImmediate', () => {
+  test('fakes setImmediate', () => {
+    const result = runJest('fake-timers-legacy/set-immediate');
+
+    expect(result.stderr).toMatch('setImmediate test');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('useRealTimers', () => {
+  test('restores timers to the native implementation', () => {
+    const result = runJest('fake-timers-legacy/use-real-timers');
+    expect(result.stdout).toMatch('API is not mocked with fake timers.');
+    expect(result.exitCode).toBe(0);
+  });
+});
+
+describe('when mocks are reset', () => {
+  test('calling resetAllMocks does not break tests', () => {
+    const result = runJest('fake-timers-legacy/reset-all-mocks');
+    expect(result.exitCode).toBe(0);
+  });
+
+  test('setting resetMocks in Jest config does not break tests', () => {
+    const result = runJest('fake-timers-legacy/reset-mocks');
+    expect(result.exitCode).toBe(0);
+  });
+});

e2e/fake-time/legacy/from-config/__tests__/test.js → e2e/fake-timers-legacy/enable-globally/__tests__/enableGlobally.test.js

@@ -7,7 +7,13 @@
 
 'use strict';
 
-test('fake timers', () => {
+test('getRealSystemTime', () => {
+  expect(() => jest.getRealSystemTime()).toThrow(
+    'getRealSystemTime is not available when not using modern timers',
+  );
+});
+
+test('setSystemTime', () => {
   expect(() => jest.setSystemTime(0)).toThrow(
     'setSystemTime is not available when not using modern timers',
   );

e2e/fake-timers-legacy/enable-globally/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "enable-globally-legacy",
+  "jest": {
+    "timers": "legacy"
+  }
+}

e2e/fake-time/legacy/requestAnimationFrame/__tests__/test.js → e2e/fake-timers-legacy/request-animation-frame/__tests__/requestAnimationFrame.test.js

@@ -9,7 +9,7 @@
 
 'use strict';
 
-test('requestAnimationFrame', () => {
+test('requestAnimationFrame test', () => {
   jest.useFakeTimers('legacy');
   let frameTimestamp = -1;
   requestAnimationFrame(timestamp => {

e2e/fake-time/legacy/requestAnimationFrame/package.json → e2e/fake-timers-legacy/request-animation-frame/package.json

@@ -1,4 +1,5 @@
 {
+  "name": "request-animation-frame-legacy",
   "jest": {
     "testEnvironment": "jsdom"
   }

e2e/fake-timers-legacy/reset-all-mocks/__tests__/resetAllMocks.test.js

@@ -0,0 +1,25 @@
+/**
+ * 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';
+
+test('works before resetAllMocks is called', () => {
+  jest.useFakeTimers();
+  const f = jest.fn();
+  setTimeout(f, 0);
+  jest.runAllTimers();
+  expect(f).toHaveBeenCalledTimes(1);
+});
+
+test('works after resetAllMocks is called', () => {
+  jest.resetAllMocks();
+  jest.useFakeTimers();
+  const f = jest.fn();
+  setTimeout(f, 0);
+  jest.runAllTimers();
+  expect(f).toHaveBeenCalledTimes(1);
+});

e2e/fake-timers-legacy/reset-all-mocks/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "reset-all-mocks",
+  "jest": {
+    "resetMocks": false,
+    "timers": "legacy"
+  }
+}

e2e/fake-time/modern/from-jest-object/__tests__/test.js → e2e/fake-timers-legacy/reset-mocks/__tests__/resetMock.test.js

@@ -7,14 +7,10 @@
 
 'use strict';
 
-test('fake timers', () => {
+test('works when resetMocks is set in Jest config', () => {
   jest.useFakeTimers();
-
-  jest.setSystemTime(0);
-
-  expect(Date.now()).toBe(0);
-
-  jest.setSystemTime(1000);
-
-  expect(Date.now()).toBe(1000);
+  const f = jest.fn();
+  setTimeout(f, 0);
+  jest.runAllTimers();
+  expect(f).toHaveBeenCalledTimes(1);
 });

e2e/fake-timers-legacy/reset-mocks/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "reset-mocks",
+  "jest": {
+    "resetMocks": true,
+    "timers": "legacy"
+  }
+}

e2e/fake-timers-legacy/set-immediate/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "set-immediate-legacy",
+  "jest": {
+    "timers": "legacy"
+  }
+}

e2e/fake-timers-legacy/use-fake-timers/package.json

@@ -0,0 +1,3 @@
+{
+  "name": "use-fake-timers-legacy"
+}

e2e/timer-use-real-timers/__tests__/useRealTimers.test.js → e2e/fake-timers-legacy/use-real-timers/__tests__/useRealTimers.test.js

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+'use strict';
+
 jest.useRealTimers();
 
 test('bar', () => {

e2e/fake-timers-legacy/use-real-timers/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "use-real-timers-legacy",
+  "jest": {
+    "timers": "legacy"
+  }
+}

e2e/modern-fake-timers/from-config/__tests__/test.js → e2e/fake-timers/enable-globally/__tests__/enableGlobally.test.js

@@ -26,3 +26,9 @@ test('fake timers with Date argument', () => {
 
   expect(Date.now()).toBe(1000);
 });
+
+test('runAllImmediates', () => {
+  expect(() => jest.runAllImmediates()).toThrow(
+    'runAllImmediates is not available when using modern timers',
+  );
+});

e2e/fake-timers/enable-globally/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "enable-globally",
+  "jest": {
+    "timers": "modern"
+  }
+}

e2e/fake-time/modern/requestAnimationFrame/__tests__/test.js → e2e/fake-timers/request-animation-frame/__tests__/requestAnimationFrame.test.js

@@ -9,7 +9,7 @@
 
 'use strict';
 
-test('requestAnimationFrame', () => {
+test('requestAnimationFrame test', () => {
   jest.useFakeTimers('modern');
   let frameTimestamp = -1;
   requestAnimationFrame(timestamp => {

e2e/fake-time/modern/requestAnimationFrame/package.json → e2e/fake-timers/request-animation-frame/package.json

@@ -1,4 +1,5 @@
 {
+  "name": "request-animation-frame",
   "jest": {
     "testEnvironment": "jsdom"
   }