如何在React Native Jest测试中模拟Push Notification Native模块? [英] How to mock Push notification native module in React native jest tests?

问题描述

使用模块react-native-push-notification时，出现此错误:

When using the module react-native-push-notification, I had this error:

 FAIL  __tests__/index.android.js
  ● Test suite failed to run

    Invariant Violation: Native module cannot be null.

      at invariant (node_modules/fbjs/lib/invariant.js:44:15)
      at new NativeEventEmitter (node_modules/react-native/Libraries/EventEmitter/NativeEventEmitter.js:32:1)
      at Object.<anonymous> (node_modules/react-native/Libraries/PushNotificationIOS/PushNotificationIOS.js:18:29)
      at Object.get PushNotificationIOS [as PushNotificationIOS] (node_modules/react-native/Libraries/react-native/react-native.js:97:34)
      at Object.<anonymous> (node_modules/react-native-push-notification/component/index.ios.js:10:23)

我尝试通过创建__mocks__/react-native.js并将此代码放入其中来模拟该模块:

I tried to mock the module by creating __mocks__/react-native.js and putting this code within it:

const rn = require('react-native')

jest.mock('PushNotificationIOS', () => ({
  addEventListener: jest.fn(),
  requestPermissions: jest.fn(),
  then: jest.fn()
}));

module.exports = rn

现在，我遇到此错误:

 FAIL  __tests__/index.android.js
  ● Test suite failed to run

    TypeError: Cannot read property 'then' of null

      at Object.<anonymous>.Notifications.popInitialNotification (node_modules/react-native-push-notification/index.js:278:42)
      at Object.<anonymous>.Notifications.configure (node_modules/react-native-push-notification/index.js:93:6)
      at Object.<anonymous> (app/utils/localPushNotification.js:4:39)
      at Object.<anonymous> (app/actions/trip.js:5:28)

我如何才能以正确的方式完全模拟该模块?

How I could mock fully this module the right way?

推荐答案

我通过创建安装文件jest/setup.js来模拟模块PushNotificationIOS:

I mocked the module PushNotificationIOS by creating a setup file jest/setup.js:

jest.mock('PushNotificationIOS', () => {
  return {
    addEventListener: jest.fn(),
    requestPermissions: jest.fn(() => Promise.resolve()),
    getInitialNotification: jest.fn(() => Promise.resolve()),
  }
});

我已通过将以下行添加到packages.json中来配置玩笑来运行此安装文件:

I've configured jest to run this setup file by adding this line into packages.json:

  "jest": {
    ...
    "setupFiles": ["./jest/setup.js"],
  }

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