How to use the @reactivex/rxjs.Observable.zip function in @reactivex/rxjs

test('reverts without touching unaffected states', t => {
  const dispatcher = createDispatcher()

  Observable.zip([
    dispatcher
      .reduce(AdderStore)
      .bufferCount(4),
    dispatcher
      .reduce(SubtractorStore)
      .bufferCount(6)
  ])
    .subscribe(([ x, y ]) => {
      t.same(x, [ 0, 1, 2, 0 ])
      t.same(y, [ 0, -1, -2, -3, -4, -5 ])
    }, err => {
      t.fail()
    }, () => {
      t.end()
    })