text: import React from 'react';
  import { shallow } from 'enzyme';
  import AppBar from '@material-ui/core/AppBar';
  
  import Header from './index';
  
  const component = shallow(<Header />);
  
  describe('<Header />', () => {
    test('renders as expected', () => {
      expect(component.find(AppBar)).toBeTruthy();
    });
  });
  