test.jsx

import { mount } from 'enzyme';
import { TextInput, PasswordInput } from 'a-plus-forms';
import SignInForm from 'src/features/auth/signin_form';

describe('<SignInForm /', () => {
  it('works beautifully', () => {
    const onSubmit = sinon.spy();
    const wrapper = mount(<SignInForm onSubmit={onSubmit} />);
    
    wrapper.find(TextInput).instance().value = 'nikolay';
    wrapper.find(PasswordInput).instance().value = 'b@(k0n!';
    
    wrapper.find('form').simulate('submit');
    
    expect(onSubmit).to.have.been.calledWith({
      username: 'nikolay', password: 'b@(k0n!'
    });
  });
});