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86968c1104
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/38955 Jest introduced "modern" timers based on `sinon/fake-timers` in Jest 26 ([release announcement](https://jestjs.io/blog/2020/05/05/jest-26#new-fake-timers)), and they became the default in Jest 27, in May 2021. Modern timers have more capabilities - they were introduced with support for `queueMicrotask`, mocking `Date`, etc., and they've continued to receive more attention from the Jest team since - they're now much more comprehensive and more configurable than legacy timers. Importantly, because they're not based on Jest mocks, they're not affected in surprising ways by eg `jest.resetAllMocks()` (a particularly confusing side-effect when fake timers are enabled globally, as in our setup). This migrates RN's own tests and config to modern fake timers, or real timers where that's more appropriate. NOTE: In cases where non-trivial changes to the tests are required, four test files are individually opted-in to `legacyFakeTimers` with a `TODO(legacy-fake-timers)`. I'll open these up for community contributions to fix. Changelog: [Internal] Reviewed By: motiz88 Differential Revision: D48189907 fbshipit-source-id: 2e7ce74cc60e80679d81d7c16d599ad1bbe2c921
65 lines
1.9 KiB
JavaScript
65 lines
1.9 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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*/
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'use strict';
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const {defaults} = require('jest-config');
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module.exports = {
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transform: {
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'^.+\\.(bmp|gif|jpg|jpeg|mp4|png|psd|svg|webp)$':
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'<rootDir>/packages/react-native/jest/assetFileTransformer.js',
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'.*': './jest/preprocessor.js',
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},
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setupFiles: ['./packages/react-native/jest/local-setup.js'],
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fakeTimers: {
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enableGlobally: true,
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legacyFakeTimers: false,
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},
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snapshotFormat: {
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escapeString: true,
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printBasicPrototype: true,
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},
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// This allows running Meta-internal tests with the `-test.fb.js` suffix.
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testRegex: '/__tests__/.*-test(\\.fb)?\\.js$',
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testPathIgnorePatterns: [
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'/node_modules/',
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'<rootDir>/packages/react-native/template',
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'<rootDir>/packages/react-native/Libraries/Renderer',
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'<rootDir>/packages/rn-tester/e2e',
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],
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transformIgnorePatterns: ['node_modules/(?!@react-native/)'],
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haste: {
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defaultPlatform: 'ios',
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platforms: ['ios', 'android'],
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},
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moduleNameMapper: {
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// This module is internal to Meta and used by their custom React renderer.
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// In tests, we can just use a mock.
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'^ReactNativeInternalFeatureFlags$':
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'<rootDir>/packages/react-native/jest/ReactNativeInternalFeatureFlagsMock.js',
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},
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moduleFileExtensions: ['fb.js'].concat(defaults.moduleFileExtensions),
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unmockedModulePathPatterns: [
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'node_modules/react/',
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'packages/react-native/Libraries/Renderer',
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'promise',
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'source-map',
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'fastpath',
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'denodeify',
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],
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testEnvironment: 'node',
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collectCoverageFrom: ['packages/react-native/Libraries/**/*.js'],
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coveragePathIgnorePatterns: [
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'/__tests__/',
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'/vendor/',
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'<rootDir>/packages/react-native/Libraries/react-native/',
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],
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};
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