Testing sequence of REST API calls - "there was no current spec"

I am trying to test the sequence of create/delete for as REST-service. The example below always passes in the IDE, but gives an error in the Karma/Jasmine debugger.

"xpect' was used when there was no current spec, 
this could be because an asynchronous test timed out"

Each test alone runs ok.

---

  it('should return the number of deleted items after creation', done => {
    const ex1 = sgformsService.getOrCreate('Endoskopie', 9999, '2019-03-20')
    const ex2 = sgformsService.deleteByParameter('Endoskopie', 9999, '2019-03-20')
    const ex = ex2.pipe(concat(ex1)).subscribe(
      (val: number) => {
        expect(val).toEqual(7)
        done()
      })
  }
  )