使用Jest模拟时找不到模块'NativeAnimatedHelper'

Question

我一直在尝试react-navigation在新的React Native应用中进行设置。当我使代码/屏幕正常工作时，按照v4 docs在库中添加后，Jest导致了我的问题。

我安装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。

当我运行默认的Jest测试时，出现如下错误：

  ? 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测试文件中：

jest.mock('NativeAnimatedHelper');

但是，当我尝试这样做时，Jest抱怨如下错误：

 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)

我一直在尝试各种方法，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"

开玩笑的配置：

{
  "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

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

Answer 2

反应本机 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 3

更改

jest.mock('NativeAnimatedHelper');

至

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

Answer 4

尽管接受的答案似乎对人们有用并且是推荐的方法之一，但它对我不起作用。另外它并不理想，因为路径可能会在下一个版本中发生变化。

按照本博客文章中提到的实现，我能够正确模拟所有单独的 react-native 模块。

实际上，我不得不通过react-native.js在里面添加一个文件来模拟 react-native 接口并将模拟test/__mocks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数量的导出。