text: import React from 'react';
  import { mount, shallow } from 'enzyme';
  import { create } from 'react-test-renderer';
  import Header from '../../components/Header';
  
  describe('<Header />', () => {
    it('render header unchanged', () => {
      const tree = create(<Header />);
      expect(tree.toJSON()).toMatchSnapshot()
    });
  
    it('renders Header component', () => {
      const header = shallow(<Header />);
      expect(header.length).toEqual(1);
    });
  
    it('renders Header title', () => {
      const header = mount(<Header />);
      expect(header.find('a').text()).toEqual('');
    });
  });
  