anchor.diff:          let result = awaiter(TimeSpan.FromSeconds(1.0))
           result |> should equal (Result "ONE")
   
  -    [<Test(* ; Ignore("Failing on appveyor (due to timing issues?)") *) >]
  +    [<Test ; Ignore("Failing on appveyor ('a observer-subscription was not disposed')")  >]
       member test.``AwaitObservable is canceled if the source completes without a single result``() =
           let source = new ObservableMock<string>()
           let wf = Async.AwaitObservable source
  
positive.code:         let result = awaiter(TimeSpan.FromSeconds(1.0))
          result |> should equal AwaiterResult<string>.Canceled    
          
      [<Test(* ; Ignore("Failing on appveyor (due to timing issues?)") *) >]
      member test.``AwaitObservable is unsubscribed from the source after a value was received``() =
          let source = new ObservableMock<string>()
          let wf = Async.AwaitObservable source
  
negative.code:         source.Next("Done")
          source.AssertUnsubscribe(TimeSpan.FromSeconds(1.0))
  
      [<Test ; Ignore("Failing on appveyor ('a observer-subscription was not disposed')")  >]
      member test.``AwaitObservable is unsubscribed from the source after the source completes without a result``() =
          let source = new ObservableMock<string>()
          let wf = Async.AwaitObservable source
  