text: import '../src/app';
  
  jest.mock('react-dom', () => {
    return {
      render: jest.fn(),
    };
  });
  
  describe('App test', () => {
    it("Render should be called", () => {
      const {render} = require('react-dom');
      expect(render).toHaveBeenCalled();
    });
    it('Create element works', () => {
      const div = document.createElement('div');
    });
  });
  