public async Task A_subscribed_receiver_can_select_a_handler_based_on_message_type()
{
var bus = new InMemoryCommandBus <ICommand <CommandTarget> >(Clock);
var received = new List <ICommand <CommandTarget> >();
var handler1 = CommandHandler.Create <CreateCommandTarget>(delivery => received.Add(delivery.Command));
var handler2 = CommandHandler.Create <UpdateCommandTarget>(delivery => received.Add(delivery.Command));
bus.Subscribe(handler1);
bus.Subscribe(handler2);
await bus.Schedule(new CreateCommandTarget(Guid.NewGuid().ToString()));
await Clock.AdvanceBy(1.Seconds());
received.Should()
.OnlyContain(c => c is CreateCommandTarget)
.And
.HaveCount(1);
}