Invariant Violation: `new NativeEventEmitter()` requires a non-null argument

Question

I tried to run default test in react-native using jest and I found this problem:

Test suite failed to run

Invariant Violation: `new NativeEventEmitter()` requires a non-null argument.

  at invariant (node_modules/invariant/invariant.js:40:15)
  at new NativeEventEmitter (node_modules/react-native/Libraries/EventEmitter/NativeEventEmitter.js:44:7)
  at Object.<anonymous> (node_modules/@react-native-clipboard/clipboard/dist/NativeClipboard.js:15:20)
  at Object.<anonymous> (node_modules/@react-native-clipboard/clipboard/dist/Clipboard.js:24:38)

I completly dont know how to solve this problem.

Ive tried to add the following line:

jest.mock('react-native/Libraries/EventEmitter/NativeEventEmitter');

to jest.setup.js

or

mocks/native_event_emmiter.js

but neither solution works.

Anyone know how to solve this ?

Answer 1

Have you add setupFiles in your jest.config.js?

This worked for me:

//jest.config.js

setupFiles: ['<rootDir>/jest.setup.js'],

//jest.setup.js

jest.mock('react-native/Libraries/EventEmitter/NativeEventEmitter');