How do I mock react-native-ibeacon in jest

Question

I am trying to mock react-native-ibeacon (a native module, I just want to test how it is called, including all functions in the Beacons object below).

Here is a code snippet that leaves Beacons undefined:

var React = require('react-native');
var Beacons = require('react-native-ibeacon');
jest.mock('react-native-ibeacon');

describe('beaconView', () => {

  console.log('Beacons', Beacons);

  Beacons.requestWhenInUseAuthorization();

  it('test pass', () => {
    expect(1).toBeTruthy();
  });
});

It fails when I try and call the requestWhenInUseAuthorization method.

What am I missing?

Answer 1

You'll need to provide a good mock using the second argument to jest.mock.

Example:

jest.mock('my-module', () => ({
    myFn: jest.fn();
}));

and then you can do:

const myModule = require('my-module');

myModule.myFn() // calling the mock function.

you need to figure out what features your external native module has and then create a mock that can behave similarly.