text: import React from 'react';
  import App from './App';
  
  import { shallow } from 'enzyme';
  import toJson from 'enzyme-to-json';
  
  it('renders without crashing', () => {
    const component = shallow(<App />);
    expect(toJson(component)).toMatchSnapshot();
    expect(component.instance()).toBeInstanceOf(App);
  });
  