anchor.diff:                  async {
                       do! Async.Sleep 100
                       let! count = queue.count()
  -                    logger.Debug "queue length %i" count
                       match count with
                       | x when x = 0L -> return! wait ()
                       | _ -> ()
  
positive.code:                 // When
                  sendJobWithBull queuename 100 |> ignore
                  do! waitForJobsToArrive queue
                  do! waitForQueueToFinish queue
  
                  //Then
                  let! length = queue.length ()
  
negative.code:                     do! Async.Sleep 100
                      let! waiting = queue.getWaiting()
                      let! active = queue.getActive()
                      match waiting.Length + active.Length with
                      | x when x > 0 -> return! wait ()
                      | _ -> ()
  