public void InvalidOperationExceptionIsThrownWhenListenerIsNotSubscribed()
{
var eventQueue = new EventQueue();
var subscribable = new TestSubscribable();
Action action = () => eventQueue.Unsubscribe(subscribable);
action.ShouldThrow <InvalidOperationException>();
}
public void ThenAnSubscribeEventIsGenerated()
{
var eventQueue = new EventQueue();
var subscribable = new TestSubscribable();
eventQueue.Subscribe(subscribable);
eventQueue
.Peek()
.Should()
.BeOfType <ListenerSubscribedEvent>();
}
public void GivenTheSameListenerIsRegisteredTwiceThenAnInvalidOperationExceptionIsThrown()
{
var eventQueue = new EventQueue();
var subscribable = new TestSubscribable();
eventQueue.Subscribe(subscribable);
Action action = () => eventQueue.Subscribe(subscribable);
action
.ShouldThrow <InvalidOperationException>();
}
public void ThenSubscribedListenerForEventTypeReceivesEvent()
{
var eventQueue = new EventQueue();
var subscribable = new TestSubscribable();
eventQueue.Subscribe(subscribable);
eventQueue.Enqueue(new TestEvent());
subscribable
.ReceivedEvents
.Should()
.HaveCount(1);
}
public void ThenTheListenerDoesntReceiveNewEvents()
{
var eventQueue = new EventQueue();
var subscribable = new TestSubscribable();
eventQueue.Subscribe(subscribable);
eventQueue.Unsubscribe(subscribable);
eventQueue.Enqueue(new TestEvent());
subscribable
.ReceivedEvents
.Should()
.HaveCount(0);
}
