React本机，不变冲突:本机模块不能为null。(指向OneSignal模块)

Question

我正在用Jest+Enzyme为一个使用OneSignal的react原生应用程序编写测试。

这里有一个类似的问题(我认为)：https://github.com/facebook/jest/issues/2208，但这个问题已经很老了，我遵循了那里的解决方案，但没有一个对我有效。

最初，我在运行jest时遇到了这个错误

home/nrion/Desktop/mobile-ui/PriceInsight_app/node_modules/react-native-onesignal/index.js:4
    import { NativeModules, NativeEventEmitter, NetInfo, Platform } from 'react-native';
    ^^^^^^

    SyntaxError: Unexpected token import

    > 1 | import OneSignal from 'react-native-onesignal';
      2 | 
      3 | export const STORE_TIMEFRAME = 'STORE_TIMEFRAME';
      4 | export const STORE_TIMEFRAMES = 'STORE_TIMEFRAMES';

      at ScriptTransformer._transformAndBuildScript (../../../../../usr/lib/node_modules/jest-cli/node_modules/jest-runtime/build/script_transformer.js:316:17)
      at Object.<anonymous> (src/actions/subscription.js:1:387)
      at Object.<anonymous> (src/reducers/subscription.js:1:402)

所以我继续将react-native-onesignal添加到package.json中：

"transformIgnorePatterns": [
      "node_modules/(?!(react-native-onesignal|react-native-login|react-native-elements)/)"
    ]

这就解决了我的问题。但另一个问题来了：

 Invariant Violation: Native module cannot be null.

    > 1 | import OneSignal from 'react-native-onesignal';
      2 | 
      3 | export const STORE_TIMEFRAME = 'STORE_TIMEFRAME';
      4 | export const STORE_TIMEFRAMES = 'STORE_TIMEFRAMES';

      at invariant (node_modules/fbjs/lib/invariant.js:42:15)
      at new NativeEventEmitter (node_modules/react-native/Libraries/EventEmitter/NativeEventEmitter.js:37:31)
      at Object.<anonymous> (node_modules/react-native-onesignal/index.js:9:33)

我试着模拟OneSignal，但当我这样做时会发生这样的情况：

 Cannot find module 'OneSignal' from 'Main.test.js'

    > 1 | import React from 'react'
      2 | import { shallow } from '../../jest-setup'
      3 | import configureStore from 'redux-mock-store'
      4 | import OneSignal from 'react-native-onesignal'

      at Resolver.resolveModule (../../../../../usr/lib/node_modules/jest-cli/node_modules/jest-resolve/build/index.js:169:17)
      at Object.<anonymous> (src/__tests__/Main.test.js:1:108)

我已经被这个问题困扰了好几个小时了！我们将非常感谢您的任何见解。

Answer 1

所以事实证明我的模型是错误的。它应该是：

jest.mock('react-native-onesignal', () => ({
  addEventListener: jest.fn(),
  removeEventListener: jest.fn(),
  inFocusDisplaying: jest.fn()
}))

正如本帖所指出的：https://github.com/facebook/jest/issues/6382#issuecomment-394104956