chore: add integration test for driving promises with fake timers (#7071

)

e2e/__tests__/fake-promises.test.js

@@ -0,0 +1,23 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. 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.
+ *
+ * @flow
+ */
+'use strict';
+
+const runJest = require('../runJest');
+
+describe('Fake promises', () => {
+  it('should be possible to resolve with fake timers using immediates', () => {
+    const result = runJest('fake-promises/immediate');
+    expect(result.status).toBe(0);
+  });
+
+  it('should be possible to resolve with fake timers using asap', () => {
+    const result = runJest('fake-promises/asap');
+    expect(result.status).toBe(0);
+  });
+});

e2e/fake-promises/asap/__tests__/generator.test.js

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. 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('fake promises', () => {
+  let someValue;
+  Promise.resolve().then(() => {
+    someValue = 'foobar';
+  });
+
+  jest.runAllTicks();
+
+  expect(someValue).toBe('foobar');
+});

e2e/fake-promises/asap/fake-promises.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. 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';
+
+global.Promise = require('promise');

e2e/fake-promises/asap/package.json

@@ -0,0 +1,9 @@
+{
+  "jest": {
+    "timers": "fake",
+    "setupFiles": [
+      "<rootDir>/fake-promises"
+    ],
+    "testEnvironment": "node"
+  }
+}

e2e/fake-promises/immediate/__tests__/generator.test.js

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. 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('fake promises', () => {
+  let someValue;
+  Promise.resolve().then(() => {
+    someValue = 'foobar';
+  });
+
+  jest.runAllImmediates();
+
+  expect(someValue).toBe('foobar');
+});

e2e/fake-promises/immediate/fake-promises.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. 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';
+
+global.Promise = require('promise/setimmediate');

e2e/fake-promises/immediate/package.json

@@ -0,0 +1,9 @@
+{
+  "jest": {
+    "timers": "fake",
+    "setupFiles": [
+      "<rootDir>/fake-promises"
+    ],
+    "testEnvironment": "node"
+  }
+}

package.json

@@ -59,6 +59,7 @@
     "prettier": "^1.13.3",
     "prettylint": "^1.0.0",
     "progress": "^2.0.0",
+    "promise": "^8.0.2",
     "readable-stream": "^3.0.3",
     "regenerator-runtime": "^0.11.0",
     "resolve": "^1.4.0",