Reactnative Test suite无法运行 TypeError：Cannot read property ‘default’ of undefined

我正试图在我的react-native 项目上设置Jest ，但它对bugsnag-react-native的效果并不好.

在我当前的测试配置中，我看到了与bugsnag的leaveBreadcrumb函数相关的错误，如下所示:

 FAIL  app/__tests__/NetworkReducer.test.js
  ● Test suite failed to run

    TypeError: Cannot read property 'default' of undefined

      at Object.<anonymous> (app/__tests__/NetworkReducer.test.js:10:20)
          at Generator.next (<anonymous>)
          at Promise (<anonymous>)

我有一个用于实例化bugsnag的帮助文件:

helpers/bugSnag.js


//-------------------------------------------------------------------------------------------------
// Create a single instance of the bugsnag client so we don't have to duplicate our configuration
// anywhere.
//-------------------------------------------------------------------------------------------------
// https://docs.bugsnag.com/platforms/react-native/#basic-configuration

import { Client, Configuration } from 'bugsnag-react-native';
const config = new Configuration();
config.consoleBreadcrumbsEnabled = true;
config.notifyReleaseStages = ['testflight', 'production'];

const bugSnag = new Client(config);


export default bugSnag;

所以在我所有的文件中，我都从这个助手文件中导入bugSnag，而不是在每个文件中声明一个新的客户机，尤其是在我的NetworkReducer.js中，bugSnag.leaveBreadcrumb('someData')导致了我的问题.

在我的NetworkReducer.test.js篇文章中，我称之为模拟:

 jest.mock(bugSnag, () => {
    return {
        leaveBreadcrumb: jest.fn()
    };
 });

我还进口了bugSnag from path/to/helpers/bugSnag个

如果我对模拟进行注释，我会在每个减速器类型上收到不同的错误消息，这些减速器类型的值为bugSnag.leaveBreadcrumb('someData')，如下所示:

TypeError: _bugSnag2.default.leaveBreadcrumb is not a function

  at Object.network_prop_update (app/reducers/NetworkReducer.js:29:19)
  at app/reducers/createReducer.js:4:29
  at Object.<anonymous> (app/__tests__/NetworkReducer.test.js:80:29)
  at tryCallTwo (node_modules/promise/lib/core.js:45:5)
  at doResolve (node_modules/promise/lib/core.js:200:13)
  at new Promise (node_modules/promise/lib/core.js:66:3)

我以为我搞错了.我附上了我的Jest setup.js作为额外参考:

    jest.mock('Linking', () => {
    return {
        addEventListener: jest.fn(),
        removeEventListener: jest.fn(),
        openURL: jest.fn(),
        canOpenURL: jest.fn(),
        getInitialURL: jest.fn(),
    };
});


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


jest.mock('react-native-intercom', () => {
    return {
        registerIdentifiedUser: jest.genMockFn().mockReturnValue(Promise.resolve()),
        registerUnidentifiedUser: jest.genMockFn().mockReturnValue(Promise.resolve()),
        updateUser: jest.genMockFn().mockReturnValue(Promise.resolve()),
        reset: jest.genMockFn().mockReturnValue(Promise.resolve()),
        logEvent: jest.genMockFn().mockReturnValue(Promise.resolve()),
        handlePushMessage: jest.genMockFn().mockReturnValue(Promise.resolve()),
        displayMessenger: jest.genMockFn().mockReturnValue(Promise.resolve()),
        hideMessenger: jest.genMockFn().mockReturnValue(Promise.resolve()),
        displayMessageComposer: jest.genMockFn().mockReturnValue(Promise.resolve()),
        displayMessageComposerWithInitialMessage: jest.genMockFn().mockReturnValue(Promise.resolve()),
        displayConversationsList: jest.genMockFn().mockReturnValue(Promise.resolve()),
        getUnreadConversationCount: jest.genMockFn().mockReturnValue(Promise.resolve()),
        setLauncherVisibility: jest.genMockFn().mockReturnValue(Promise.resolve()),
        setInAppMessageVisibility: jest.genMockFn().mockReturnValue(Promise.resolve()),
        setupAPN: jest.genMockFn().mockReturnValue(Promise.resolve()),
        registerForPush: jest.genMockFn().mockReturnValue(Promise.resolve()),
        setUserHash: jest.genMockFn().mockReturnValue(Promise.resolve()),
        setBottomPadding: jest.genMockFn().mockReturnValue(Promise.resolve()),
        addEventListener: jest.fn(),
        removeEventListener: jest.fn()
    };
});


jest.mock('bugsnag-react-native', () => {
    return {
        leaveBreadcrumb: jest.fn(),
        Configuration: jest.fn(),
        Client: jest.fn()
    };
});