Testing Bus.Send()

Question

I have this method:

public void Timeout(PaymentResponseTimeout state)
{
if (Data.PaymentResponseProcessAt > DateTime.UtcNow) return;

Bus.Send(Settings.Default.BookingAutomationQueue, new QueuePnrCmd(Data.SessionData, Data.QueueingInformation));

CloseWorkflow();
}

And I want to test if the message has been send correctly, i'm doing this with following test:

Test.Initialize();    
Test.Saga<GdsFlowService>()
    .WithExternalDependencies(s => s.Data.SessionData = TestData.GetSessionDataGds())
    .ExpectSend< QueuePnrCmd >()
    .When(s => s.Timeout(new PaymentResponseTimeout()))
    .AssertSagaCompletionIs(true);

But when doing this i get following exception:

System.Exception : ExpectedSendInvocation<Gateway.Bus.FlowCoordinator.Contracts.Command.QueuePnrCmd> not fulfilled.

When i watch the queue i see that one has been added.

Now my question is how can I check with a test that it has been send correct. I'm I forgetting to do something in the configuration maybe?

Thank you for your time.