CODEWITHSUNDEEP
javascriptreact-nativemockingapple-push-notificationsjestjs
Assem
Assem

Reputation: 12097

How to mock Push notification native module in React native jest tests?

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)

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

Now, I have this error:

 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)

How I could mock fully this module the right way?

Upvotes: 5

Views: 6641

Answers (3)

Manik Kumar
Manik Kumar

Reputation: 1577

You can directly put react-native-push-notification-ios in tranformIgnorePatterns.

enter image description here

Upvotes: 0

Assem
Assem

Reputation: 12097

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()),
  }
});

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

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

Upvotes: 8

Andreas K&#246;berle
Andreas K&#246;berle

Reputation: 110922

The problem is that in the line where the error is thrown, the lib tries to call getInitialNotification in the react-native module and expect an promise with some kind of result to be return. So you need to add this function to the mock and let it return a resolved promise.

Upvotes: 1

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