medium failed test

thing.3.spec.js

  describe('when the state changes', () => {
    it('it renders correctly', () => {
      component = shallow(<Thing value={3} />);
      expect(component.find('h1').text()).toEqual('The value is 3');

      // lets alter the state
      component.setState({ message: 'You have a value of' });
      // remember our shouldComponentUpdate() rejects any update
      // unless the prop value has changed
      expect(component.find('h1').text()).toEqual('The value is 3');
    });
  });