medium-todo-delete-button-test.js

it('should delete the todo when clicking the delete button', function() {
  const Button = createSpy();
  const onDeleteSpy = spy();
  
  jest.mock('./button.jsx', () => Button);
  
  const Todo = require('./todo.jsx');
  render(<Todo name="buy milk" onDelete={onDeleteSpy} />);
         
  Button.lastProps.onSubmit();
  
  expect(onDeleteSpy).to.have.been.called;
});