// Unit test
  describe('SomeComponent' () => {
  it('validates model on button click', () => {
      const handleSubmit = jest.fn();
      const wrapper = mount(
          
      );
      const instance = wrapper.instance();
      const submitBtn = app.find('#sign-in')
      submitBtn.simulate('click')
      expect(handleSubmit).toHaveBeenCalled();
    });
  }