Neither sinon faker server respond nor ajax delays

sinon-faker-server-ajax-delay-test.js

describe('neither sinon faker server respond nor ajax delays', () => {
  let server
  beforeEach('set up fake server', () => {
    server = sinon.fakeServer.create()
    server.respondWith("GET", 'hey/you', [200, { 'Content-Type': 'application/json' }, JSON.stringify({})])
  })
  afterEach(() => server.restore())

  context('when ajax is called', () => {
    let result
    beforeEach(() => {
      ajax('hey/you').then(
        () => { result = 'okay' }
      )
    })

    it('ajax adds request to faker server queue', () => {
      expect(server.requests[0].url).eq('hey/you')
    })

    it('does not has result yet', () => {
      expect(result).to.not.exist
    })

    context('when server responds', () => {
      beforeEach(() => {
        server.respond()
      })

      it('ajax does receive and process the response immediately', () => {
        expect(result).to.eq('okay')
      })

      it('of course works after waiting for 1ms', done => {
        setTimeout(
          () => {
            expect(result).to.eq('okay')
            done()
          },
          1
        )
      })
    })
  })
})

This test passes