webamp/js/__tests__/MainWindow.js

const Winamp = ({
  media: {
    addEventListener: jest.fn(),
    _analyser: null
  }
});

const canvasMockify = require('canvas-mock');

function createNodeMock(element) {
  if (element.type === 'canvas') {
    const Canvas = window.document.createElement('canvas');
    canvasMockify(Canvas); // mock canvas functions required by Phaser.js are added
    return Canvas;
  }
  return null;
}

window.requestAnimationFrame = () => {};

import React from 'react';
import {Provider} from 'react-redux';
import renderer from 'react-test-renderer';
import getStore from '../store';

import MainWindow from '../components/MainWindow';

describe('MainWindow', () => {
  let store;
  beforeEach(() => {
    store = getStore(Winamp);
  });

  it('renders to snapshot', () => {
    const options = {createNodeMock};
    const tree = renderer.create(
      <Provider store={store}>
        <MainWindow
          winamp={Winamp}
          mediaPlayer={Winamp.media}
        />
      </Provider>,
      options).toJSON();
    expect(tree).toMatchSnapshot();
  });
});