/
runtime_require_module_or_mock.test.js
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/
runtime_require_module_or_mock.test.js
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/**
* 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';
const moduleNameMapper = {
'\\.css$': '<rootDir>/__mocks__/ManuallyMocked',
'^[./a-zA-Z0-9$_-]+.png$': 'RelativeImageStub',
'^image![a-zA-Z0-9$_-]+$': 'global_image_stub',
mappedToDirectory: '<rootDir>/MyDirectoryModule',
mappedToModule: '<rootDir>/TestModuleNameMapperResolution',
mappedToPath: '<rootDir>/global_image_stub.js',
'module/name/(.*)': '<rootDir>/mapped_module_$1.js',
};
let createRuntime;
beforeEach(() => {
createRuntime = require('createRuntime');
});
it('mocks modules by default when using automocking', async () => {
const runtime = await createRuntime(__filename, {
automock: true,
moduleNameMapper,
});
const exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'RegularModule',
);
expect(exports.setModuleStateValue._isMockFunction).toBe(true);
});
it("doesn't mock modules when explicitly unmocked when using automocking", async () => {
const runtime = await createRuntime(__filename, {
automock: true,
moduleNameMapper,
});
const root = runtime.requireModule(runtime.__mockRootPath);
root.jest.unmock('RegularModule');
const exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'RegularModule',
);
expect(exports.isRealModule).toBe(true);
});
it("doesn't mock modules when explicitly unmocked via a different name", async () => {
const runtime = await createRuntime(__filename, {
automock: true,
moduleNameMapper,
});
const root = runtime.requireModule(runtime.__mockRootPath);
root.jest.unmock('./RegularModule');
const exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'RegularModule',
);
expect(exports.isRealModule).toBe(true);
});
it("doesn't mock modules when disableAutomock() has been called", async () => {
const runtime = await createRuntime(__filename, {moduleNameMapper});
const root = runtime.requireModule(runtime.__mockRootPath);
root.jest.disableAutomock();
const exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'RegularModule',
);
expect(exports.isRealModule).toBe(true);
});
it('uses manual mock when automocking on and mock is available', async () => {
const runtime = await createRuntime(__filename, {
automock: true,
moduleNameMapper,
});
const exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ManuallyMocked',
);
expect(exports.isManualMockModule).toBe(true);
});
it('does not use manual mock when automocking is off and a real module is available', async () => {
const runtime = await createRuntime(__filename, {moduleNameMapper});
const root = runtime.requireModule(runtime.__mockRootPath);
root.jest.disableAutomock();
const exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ManuallyMocked',
);
expect(exports.isManualMockModule).toBe(false);
});
it('resolves mapped module names and unmocks them by default', async () => {
const runtime = await createRuntime(__filename, {
moduleFileExtensions: ['js', 'jsx'],
moduleNameMapper,
});
let exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'image!not_really_a_module',
);
expect(exports.isGlobalImageStub).toBe(true);
exports = runtime.requireModuleOrMock(runtime.__mockRootPath, 'mappedToPath');
expect(exports.isGlobalImageStub).toBe(true);
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'mappedToModule',
);
expect(exports.moduleNameMapperResolutionWorks).toBe(true);
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'mappedToDirectory',
);
expect(exports.isIndex).toBe(true);
exports = runtime.requireModuleOrMock(runtime.__mockRootPath, 'cat.png');
expect(exports.isRelativeImageStub).toBe(true);
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'../photos/dog.png',
);
expect(exports.isRelativeImageStub).toBe(true);
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'module/name/test',
);
expect(exports).toBe('mapped_module');
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'subdir1/style.css',
);
expect(exports.isManualMockModule).toBe(true);
});
it('automocking is disabled by default', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
const exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'RegularModule',
);
expect(exports.setModuleStateValue._isMockFunction).toBeUndefined();
});
it('unmocks modules in config.unmockedModulePathPatterns for tests with automock enabled when automock is false', async () => {
const runtime = await createRuntime(__filename, {
automock: false,
moduleNameMapper,
unmockedModulePathPatterns: ['npm3-main-dep'],
});
const root = runtime.requireModule(runtime.__mockRootPath);
root.jest.enableAutomock();
const nodeModule = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'npm3-main-dep',
);
const moduleData = nodeModule();
expect(moduleData.isUnmocked()).toBe(true);
});
it('unmocks virtual mocks after they have been mocked previously', async () => {
const runtime = await createRuntime(__filename);
const root = runtime.requireModule(runtime.__mockRootPath);
const mockImpl = {foo: 'bar'};
root.jest.mock('my-virtual-module', () => mockImpl, {virtual: true});
expect(
runtime.requireModuleOrMock(runtime.__mockRootPath, 'my-virtual-module'),
).toEqual(mockImpl);
root.jest.unmock('my-virtual-module');
expect(() => {
runtime.requireModuleOrMock(runtime.__mockRootPath, 'my-virtual-module');
}).toThrow(
new Error("Cannot find module 'my-virtual-module' from 'root.js'"),
);
});
describe('resetModules', () => {
it('resets all the modules', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
let exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
exports.increment();
expect(exports.getState()).toBe(2);
runtime.resetModules();
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
});
describe('isolateModules', () => {
it('keeps its registry isolated from global one', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
let exports;
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
exports.increment();
expect(exports.getState()).toBe(2);
runtime.isolateModules(() => {
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(2);
});
it('resets all modules after the block', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
let exports;
runtime.isolateModules(() => {
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
exports.increment();
expect(exports.getState()).toBe(2);
});
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
it('resets module after failing', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
expect(() =>
runtime.isolateModules(() => {
throw new Error('Error from isolated module');
}),
).toThrow('Error from isolated module');
runtime.isolateModules(() => {
expect(true).toBe(true);
});
});
it('cannot nest isolateModules blocks', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
expect(() => {
runtime.isolateModules(() => {
runtime.isolateModules(() => {});
});
}).toThrow(
'isolateModules cannot be nested inside another isolateModules or isolateModulesAsync.',
);
});
it('can call resetModules within a isolateModules block', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
let exports;
runtime.isolateModules(() => {
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
exports.increment();
runtime.resetModules();
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
describe('can use isolateModules from a beforeEach block', () => {
let exports;
beforeEach(() => {
jest.isolateModules(() => {
exports = require('./test_root/ModuleWithState');
exports.set(1); // Ensure idempotency with the isolateModulesAsync test
});
});
it('can use the required module from beforeEach and re-require it', () => {
expect(exports.getState()).toBe(1);
exports.increment();
expect(exports.getState()).toBe(2);
exports = require('./test_root/ModuleWithState');
expect(exports.getState()).toBe(1);
exports.increment();
expect(exports.getState()).toBe(2);
});
});
});
describe('isolateModulesAsync', () => {
it('keeps its registry isolated from global one', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
let exports;
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
exports.increment();
expect(exports.getState()).toBe(2);
await runtime.isolateModulesAsync(async () => {
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(2);
});
it('resets all modules after the block', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
let exports;
await runtime.isolateModulesAsync(async () => {
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
exports.increment();
expect(exports.getState()).toBe(2);
});
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
it('resets module after failing', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
await expect(
runtime.isolateModulesAsync(async () => {
throw new Error('Error from isolated module');
}),
).rejects.toThrow('Error from isolated module');
await runtime.isolateModulesAsync(async () => {
expect(true).toBe(true);
});
});
it('cannot nest isolateModulesAsync blocks', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
await expect(async () => {
await runtime.isolateModulesAsync(async () => {
await runtime.isolateModulesAsync(() => Promise.resolve());
});
}).rejects.toThrow(
'isolateModulesAsync cannot be nested inside another isolateModulesAsync or isolateModules.',
);
});
it('can call resetModules within a isolateModules block', async () => {
const runtime = await createRuntime(__filename, {
moduleNameMapper,
});
let exports;
await runtime.isolateModulesAsync(async () => {
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
exports.increment();
runtime.resetModules();
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
exports = runtime.requireModuleOrMock(
runtime.__mockRootPath,
'ModuleWithState',
);
expect(exports.getState()).toBe(1);
});
describe('can use isolateModulesAsync from a beforeEach block', () => {
let exports;
beforeEach(async () => {
await jest.isolateModulesAsync(async () => {
exports = require('./test_root/ModuleWithState');
exports.set(1); // Ensure idempotency with the isolateModules test
});
});
it('can use the required module from beforeEach and re-require it', () => {
expect(exports.getState()).toBe(1);
exports.increment();
expect(exports.getState()).toBe(2);
exports = require('./test_root/ModuleWithState');
expect(exports.getState()).toBe(2);
exports.increment();
expect(exports.getState()).toBe(3);
});
});
});