Selecting from a dropdown

Let's move on to creating our appointment form. This form is used to book an appointment for a customer. The first field is the service the customer requires: cut, color, blow-dry, and so on:

1. Create a new file, test/AppointmentForm.test.js, with the following test and setup:

import React from 'react';
import { createContainer } from './domManipulators';
import { AppointmentForm } from '../src/AppointmentForm';

describe('AppointmentForm', () => {
  let render, container;

  beforeEach(() => {
    ({ render, container } = createContainer());
  });

  const form = id =>
    container.querySelector(`form[id="${id}"]`);

  it('renders a form', () => {
    render(<AppointmentForm />);
    expect(form('appointment')).not.toBeNull...