card-with-button.test.js

it('should ask a new Card when click the button', () => {
  const cards = [];
  const setCards = jest.fn();
  useGlobal.mockReturnValueOnce([cards, setCards]);

  const wrapper = shallow(<Cards />);
  wrapper.find('button').simulate('click');
  expect(getRandomCard).toHaveBeenCalledWith(cards);
  expect(setCards).toHaveBeenCalledWith(getRandomCard.mock.results[0].value);
});