public void stash_test2() { //Arrange var pingPongActor = MockFactory .WhenActorReceives <PingMessage>() .ItShouldDo((a) => a.Stash.Stash()) .CreateMockActorRef <MockActor2>(); //Act pingPongActor.Tell(new PingMessage()); System.Threading.Thread.Sleep(TimeSpan.FromSeconds(3)); MockFactory.ClearAllMessages(); //Assert Assert.Throws <Exception>(() => MockFactory.ExpectMockActor(pingPongActor).ToHaveReceivedMessage <PingMessage>()); }