text: const app = require('./server');
  const request = require('supertest');
  
  test('server is listening to / as an html', done => {
    request(app)
      .get('/')
      .expect('Content-Type', /html/)
      .expect(200, done);
  })
  
  test('bundle.js is built and the server returns bundle.js', done => {
    request(app)
      .get('/bundle.js')
      .expect('Content-Type', /javascript/)
      .expect(200, done);
  })
  