content: import React from 'react';
  import { shallow } from 'enzyme';
  import { CardHeader } from '../';
  
  describe('CardHeader', () => {
    it('should render with "card-header" class', () => {
      const wrapper = shallow(<CardHeader>Yo!</CardHeader>);
  
      expect(wrapper.text()).toBe('Yo!');
      expect(wrapper.hasClass('card-header')).toBe(true);
    });
  
    it('should render additional classes', () => {
      const wrapper = shallow(<CardHeader className="other">Yo!</CardHeader>);
  
      expect(wrapper.hasClass('other')).toBe(true);
      expect(wrapper.hasClass('card-header')).toBe(true);
    });
  
    it('should render custom tag', () => {
      const wrapper = shallow(<CardHeader tag="main">Yo!</CardHeader>);
  
      expect(wrapper.text()).toBe('Yo!');
      expect(wrapper.hasClass('card-header')).toBe(true);
      expect(wrapper.find('main').length).toBe(1);
    });
  });
  