TypeError: Cannot read property 'PlatformLocalStorage' of undefined

Question

我正在运行对 react-native 进行开玩笑测试并得到以下错误

测试套件未能运行

TypeError: Cannot read property 'PlatformLocalStorage' of undefined

  2 | import thunk from 'redux-thunk';
  3 | import { persistStore, persistReducer } from 'redux-persist';
> 4 | import AsyncStorage from '@react-native-community/async-storage';
    | ^
  5 |

"dependencies":{
    "react": "16.8.3",
    "react-native": "0.59.9",
},
"devDependencies": {
  "jest": "^24.1.0",
  "enzyme": "^3.9.0",
    "enzyme-adapter-react-16": "^1.10.0",
},

  "jest": {
    "setupFilesAfterEnv": [
      "<rootDir>/__tests__/setup/test-setup.js"
    ],
    "setupFiles": [
      "<rootDir>/__tests__/setup/test-setup.js"
    ],
    "transformIgnorePatterns": [
      "/node_modules(?![\/]rn-fetch-blob[\/]|[\/]react-native[\/]|[\/]react-native-config[\/]|[\/]react-native-navigation[\/]|[\/]react-native-status-bar-height[\/]|[\/]react-native-animatable[\/]|[\/]react-native-restart[\/]|[\/]react-native-linear-gradient[\/]|[\/]react-native-i18n[\/]|[\/]react-native-modal[\/]|[\/]react-native-smooth-pincode-input[\/]|[\/]react-native-swipe-gestures[\/]|[\/]react-native-root-toast[\/]|[\/]react-native-root-siblings[\/]|[\/]static-container[\/]|[\/]react-native-elements[\/]|[\/]react-native-ratings[\/]|[\/]react-native-progress[\/]|[\/]react-native-dialog[\/]|[\/]react-native-pdf[\/]|[\/]react-native-webview[\/]|[\/]react-native-check-box[\/]|[\/]react-native-share[\/]|[\/]react-native-haptic-feedback[\/]|[\/]react-native-responsive-screen[\/]|[\/]react-native-keyboard-aware-scroll-view[\/]|[\/]he[\/]|[\/]react-native-iphone-x-helper[\/]|[\/]check-prop-types[\/]|[\/]react-native-image-progress[\/]|[\/]react-native-theming[\/]|[\/]@react-native-community/async-storage[\/])/"
    ],
    "testPathIgnorePatterns": [
      "<rootDir>/(build|docs|node_modules)/",
      "<rootDir>/__tests__/setup"
    ],
    "preset": "react-native"
  },
  "rnpm": {
    "assets": [
      "fonts"
    ]
  }
}

有人可以帮我解释为什么当我运行在 react-native 应用程序中开玩笑测试时会出现这个错误。我已经更新了几个开发依赖项，但没有成功。

Answer 1

模拟 AsyncStorage 库。如果像我一样，您已经从 react-native 变体移植到 react-native-community 变体，您可能需要更新您的模拟（如果您已经有了）。

jest.mock("@react-native-community/async-storage", () => {
   // a map/dict/kvs of types to return - the leaves of the def
   // are jest functions
   const apiMock = {
    getItem: jest.fn(() => {  // mock's AsyncStorage.getItem()
      return JSON.stringify("some mock data");
    }),
   };
   return apiMock;
 });

Answer 2

解决方案是模拟包。

在你的项目根目录下，创建 __mocks__/@react-native-async-storage directory.
在该文件夹中，创建 async-storage.js 文件。
在该文件中，导出异步存储模拟。

export default from '@react-native-async-storage/async-storage/jest/async-storage-mock'

完整说明在这里https://react-native-async-storage.github.io/async-storage/docs/advanced/jest

TypeError: Cannot read property 'PlatformLocalStorage' of undefined

TypeError: Cannot read property 'PlatformLocalStorage' of undefined

jestjs

react-native

enzyme

enzyme-to-snapshot