Question

我一直在尝试在新的React Native应用中设置react-navigation。当我使代码/屏幕正常工作时，Jest在按照v4 docs添加库之后，导致我遇到问题。

我安装了react-navigation，react-native-reanimated，react-native-gesture-handler和react-native-screens@^1.0.0-alpha.23。然后，我进入ios文件夹并运行pod install。因为我使用的是React Native v0.61，所以它们应该已经自动链接了。

运行默认的Jest测试时，出现类似以下错误：

  ✓ renders correctly (106ms)

  console.warn node_modules/react-native/Libraries/Animated/src/NativeAnimatedHelper.js:270
    Animated: `useNativeDriver` is not supported because the native animated module is missing. Falling back to JS-based animation. To resolve this, add `RCTAnimation` module to this app, or remove `useNativeDriver`. More info: https://github.com/facebook/react-native/issues/11094#issuecomment-263240420

我搜索了此错误，大多数建议的答案是将其放入我的测试文件中：

jest.mock('NativeAnimatedHelper');

但是，当我尝试这样做时，Jest抱怨这样的错误：

 FAIL  __tests__/App-test.tsx
  ● Test suite failed to run

    Cannot find module 'NativeAnimatedHelper' from 'App-test.tsx'

       6 | import renderer from 'react-test-renderer'
       7 |
    >  8 | jest.mock('NativeAnimatedHelper')
         | ^
       9 |
      10 | it('renders correctly', () => {
      11 |   renderer.create(<App />)

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:259:17)
      at Object.<anonymous> (__tests__/App-test.tsx:8:1)

一段时间以来，我一直在尝试各种事情，任何帮助/建议将不胜感激！

版本：

Node: 10.16.1
npm: 6.11.3
"react": "^16.9.0",
"react-native": "0.61.1",
"react-native-gesture-handler": "^1.4.1",
"react-native-reanimated": "^1.3.0",
"react-native-screens": "^1.0.0-alpha.23",
"react-navigation": "^4.0.10",
"react-navigation-stack": "^1.9.3",

"babel-jest": "^24.1.0"
"jest": "^24.1.0"
"react-test-renderer": "^16.9.0"

最佳配置：

{
  "jest": {
    "preset": "react-native",
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ],
    "setupFiles": [
      "./node_modules/react-native-gesture-handler/jestSetup.js"
    ],
    "transformIgnorePatterns": [
      "node_modules/(?!((jest-)?react-native|react-navigation|@react-navigation/.*))"
    ]
  }
}

Answer 1

更改

jest.mock('NativeAnimatedHelper');

收件人

jest.mock('react-native/Libraries/Animated/src/NativeAnimatedHelper');

Answer 2

对于 RN 64，它应该是 jest.mock('react-native/Libraries/Animated/NativeAnimatedHelper');

Answer 3

尽管公认的答案似乎对人们有用，并且是推荐的方法之一，但对我却没有用。另外，它也不理想，因为在下一个版本中路径可能会更改。

按照此blog post中提到的实施方式，我能够适当地模拟所有单独的本机模块。

实际上，我不得不通过在react-native.js内添加一个test/__mocks文件来模拟react-native接口，并将模拟后的模块导出为：

import * as ReactNative from "react-native";

export const Image = "NativeAnimatedHelper";


export default Object.setPrototypeOf(
  {
    NativeAnimatedHelper
  },
  ReactNative
);

您可以根据需要在测试中添加任意多个导出。

Answer 4

React Native v0.64.0

src 文件夹已从 Animated

中删除

您需要从模拟路径中删除 src：

Before:
jest.mock('react-native/Libraries/Animated/src/NativeAnimatedHelper');

After:
jest.mock('react-native/Libraries/Animated/NativeAnimatedHelper');

Answer 5

我不想每次使用NativeAnimatedHelper时都这样做，因此我将模拟添加到了jestSetup.js文件中。

// test/jestSetup.js
jest.mock('react-native/Libraries/Animated/src/NativeAnimatedHelper');

该文件应包含在jest.config.js文件中

module.exports = {
  setupFiles: [
    '<rootDir>/tests/jestSetup.js',
  ],
};

使用Jest模拟时找不到模块'NativeAnimatedHelper'

5 个答案: