如何在反应本机玩笑测试中模拟推送通知本机模块？

Question

在使用模块react-native-push-notification时，出现了以下错误：

 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)

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

const rn = require('react-native')

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

module.exports = rn

现在，我有一个错误：

 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)

我怎么才能用正确的方式完全地嘲笑这个模块呢？

Answer 1

我通过创建一个安装文件PushNotificationIOS来模拟模块jest/setup.js。

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

我已经将jest配置为通过将该行添加到packages.json来运行这个安装文件

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

Answer 2

问题是，在抛出错误的行中，lib试图在react本机模块中调用getInitialNotification，并期望返回某种结果。因此，您需要将这个函数添加到模拟中，并让它返回一个已解决的承诺。

Answer 3

您可以直接将react-native-push-notification-ios放在tranformIgnorePatterns中。

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