CameraSettings-spy-with-mock.js

import React from 'react';
import { shallow } from 'enzyme';
import mockStore from 'redux-mock-store';

import sinon from 'sinon';
import { NativeModules } from 'react-native';

import CameraSettings from 'components/menu/CameraSettings';

const initialState = {
  preferences: {
    save_photos_locally: true,
    open_to_camera: true,
  },
};

jest.mock('NativeModules', () => {
  return {
    PhotoActions: {
      saveToPhone: jest.fn(),
    },
  };
});

describe('Testing CameraSettings', () => {
  const wrapper = shallow(
    <CameraSettings />,
    { context: { store: mockStore(initialState) } },
  );
  const render = wrapper.dive();

  it('renders as expected', () => {
    expect(render).toMatchSnapshot();
  });

  const saveToPhoneSpy = sinon.spy(NativeModules.PhotoActions, 'saveToPhone');

  it('calls actions as expected when toggling switches', () => {
    render.find('Switch').forEach(child => {
      child.simulate('valueChange');
    });
    
    expect(saveToPhoneSpy.calledOnce).toBe(true);
  });
});