text: import React from 'react';
  import Main from '../../app/components/Main.jsx';
  import Enzyme from 'enzyme';
  import Adapter from 'enzyme-adapter-react-16';
  import { H3 } from '../../app/components/shared/Header.jsx';
  
  Enzyme.configure({ adapter: new Adapter() });
  
  describe('Main file', () => {
    const wrapper = Enzyme.shallow(<Main />);
    test('should contain Header component', () => {
      expect(wrapper.find(H3).exists()).toBe(true);
    });
  
    test('should have header as Crypto Coin Portfolio on the Header component', () => {
      expect(wrapper.find(H3).props().children).toBe('Crypto Coin Portfolio');
    });
  });
  