text: import React from 'react';
  import { Header } from '../../components/Header';
  import { shallow } from 'enzyme';
  
  test('should render Header correctly', () => {
    const wrapper = shallow(<Header startLogout={() => {}} />);
    expect(wrapper).toMatchSnapshot();
  });
  
  test('should call startLogout on button click', () => {
    const startLogout = jest.fn();
    const wrapper = shallow(<Header startLogout={startLogout} />);
    wrapper.find('button').simulate('click');
    expect(startLogout).toHaveBeenCalled();
  });
  