examples/cra-react15/src/App.test.js
import React from 'react';
import ReactDOM from 'react-dom';
import global from 'global';
import App from './App';
const { document } = global;
it('renders without crashing', () => {
const div = document.createElement('div');
ReactDOM.render(<App />, div);
ReactDOM.unmountComponentAtNode(div);
});