React native TypeError:无法读取属性'；平台本地存储'；未定义的

我正在react native上运行jest测试，并出现以下错误

测试套件无法运行

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 | 

“依赖项”：{
“反应”：“16.8.3”，
“反应本机”：“0.59.9”，
},
“依赖性”：{
“笑话”：“^24.1.0”，
“酶”：“^3.9.0”，
“酶-适配器-反应-16”：“^1.10.0”，
},
“笑话”：{
“SetupFileAfterEnv”：[
“/\uuuu测试\uuuu/setup/test setup.js”
],
“设置文件”：[
“/\uuuu测试\uuuu/setup/test setup.js”
],
“transformIgnorePatterns”：[
“/node\u模块（？！[\\/]rn fetch blob[\\/]\\\/]react native[\\/]\\/]react native config[\\/]\\\/]react native navigation[\\\/]react native status bar height[\\/]react native animatable[\\\/]react native animatable[\\\/]react native native重新启动[\\\/]react native线性渐变[\\/]react native[\\/]react native[\/]react native[\\\/]react native[\\/]react native[\/]反应本机平滑pincode输入[\\/]\\\/]反应本机滑动手势[\\/]\\\/]反应本机根toast[\\/]\\/]反应本机根同级[\\/]\\\/]反应本机进程[\\/]\\\/]静态容器[\\\/]\\\\/]反应本机元素[\\\/]\\/]反应本机分级[\\\\/]反应本机进程[\\\\/]反应本机对话框[\/\\/]react native webview[\/][\\/][\\/]react native复选框[\\/][\\\/]react native share[\\/][\\/]react native触觉反馈[\\/][\\/]react native responsive screen[\\/]react native键盘感知滚动视图[\\\/]他[\\\/]react-native-iphone x-helper[\/]react-native-iphone x-helper[\/]检查项目类型[\\\/][\\\\\/]进程[\\/]react-native主题化[\\/]\[\\/]@react-native社区/异步存储[\\/]）/”
],
“testPathIgnorePatterns”：[
“/（构建|文档|节点|模块）/”，
“/\测试\设置”
],
“预设”：“本机反应”
},
“rnpm”：{
“资产”：[
“字体”
]
}
}

---

当我在react原生应用程序中运行jest测试时，有人能帮我解释为什么会出现这种错误吗。我已经更新了几个开发人员依赖项，但运气不佳。

模拟异步存储库。如果像我一样，您已经从

react native

变体移植到

react native社区

，您可能需要更新您的mock（如果您已经有了）

---

解决方案是模拟包

在项目根目录中，创建

\uuuumocks\uuuu/@react本机异步存储目录

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

从“@react native async storage/async storage/jest/async storage mock”导出默认值

完整的说明在这里

"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"
    ]
  }
}

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;
 });