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TypeError failed to run in test case: cannot read property 'default' from undefined

I am trying to configure Jest for my reaction project, but it did not play well with bugsnag-react-native .

p>

With my current test configuration, I see errors related to the bugsnag function leaveBreadcrumb, which is visible below:

 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>)

I have a helper file that instantiates bugsnag:

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;

Therefore, in all my files, I import bugSnag from this auxiliary file instead of announcing a new client in each file, especially in mine NetworkReducer.js, where it bugSnag.leaveBreadcrumb('someData')causes me problems.

In mine, NetworkReducer.test.jsI call the layout:

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

where i also import bugSnag from path/to/helpers/bugSnag

, , bugSnag.leaveBreadcrumb('someData'), :

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)

, , , , . Jest setup.js :

    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()
    };
});
+13
4

, :

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

.

+5

, . react-test-renderer , react-test-renderer , .

PureComponent:

constructor(props) {
    super(props)
}
+18

, -.

Github :

sed -i -- 's/inlineRequires: true,/inlineRequires: false,/' node_modules/react-native/jest/preprocessor.js

postinstall . , Github , :-)

+5

I solved this by simply moving my class variables to the constructor. Even if I had constructors, I still got this error, so moving them to the constructor eliminated the error. Also found that here: https://github.com/facebook/react-native/issues/22437#issuecomment-445898652

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