public void WhenConstructed_ThenDoesNotAttachToSource()
{
var added = false;
var removed = false;
var observable = new WeakObservableEvent <EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => added = true,
handler => removed = true);
Assert.False(added);
Assert.False(removed);
}
public void WhenConstructed_ThenDoesNotAttachToSource()
{
var added = false;
var removed = false;
var observable = new WeakObservableEvent<EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => added = true,
handler => removed = true);
Assert.False(added);
Assert.False(removed);
}
public void WhenSourceEventRaised_ThenInvokesOnNextOnSubscriber()
{
EventHandler raiseHandler = null;
EventArgs args = new EventArgs();
var subscriber = new Mock <IObserver <IEvent <EventArgs> > >();
var observable = new WeakObservableEvent <EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => raiseHandler = handler,
handler => { });
var subscription = observable.Subscribe(subscriber.Object);
raiseHandler(this, args);
subscriber.Verify(x => x.OnNext(It.Is <IEvent <EventArgs> >(e => e.EventArgs == args)));
}
public void WhenSourceEventRaised_ThenInvokesOnNextOnSubscriber()
{
EventHandler raiseHandler = null;
EventArgs args = new EventArgs();
var subscriber = new Mock<IObserver<IEvent<EventArgs>>>();
var observable = new WeakObservableEvent<EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => raiseHandler = handler,
handler => { });
var subscription = observable.Subscribe(subscriber.Object);
raiseHandler(this, args);
subscriber.Verify(x => x.OnNext(It.Is<IEvent<EventArgs>>(e => e.EventArgs == args)));
}
public void WhenLastSubscriberRemovedByDisposingSubscription_ThenDetachesFromSource()
{
var added = 0;
var removed = 0;
var subscriber = new Mock <IObserver <IEvent <EventArgs> > >();
var observable = new WeakObservableEvent <EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => added++,
handler => removed++);
var subscription = observable.Subscribe(subscriber.Object);
subscription.Dispose();
Assert.Equal(1, added);
Assert.Equal(1, removed);
}
public void WhenLastSubscriberRemovedByDisposingSubscription_ThenDetachesFromSource()
{
var added = 0;
var removed = 0;
var subscriber = new Mock<IObserver<IEvent<EventArgs>>>();
var observable = new WeakObservableEvent<EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => added++,
handler => removed++);
var subscription = observable.Subscribe(subscriber.Object);
subscription.Dispose();
Assert.Equal(1, added);
Assert.Equal(1, removed);
}
public void WhenFirstSubscriberAdded_ThenAttachesToSource()
{
var added = 0;
var removed = 0;
var observable = new WeakObservableEvent <EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => added++,
handler => removed++);
observable.Subscribe(new Mock <IObserver <IEvent <EventArgs> > >().Object);
Assert.Equal(1, added);
Assert.Equal(0, removed);
observable.Subscribe(new Mock <IObserver <IEvent <EventArgs> > >().Object);
Assert.Equal(1, added);
Assert.Equal(0, removed);
}
public void WhenFirstSubscriberAdded_ThenAttachesToSource()
{
var added = 0;
var removed = 0;
var observable = new WeakObservableEvent<EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => added++,
handler => removed++);
observable.Subscribe(new Mock<IObserver<IEvent<EventArgs>>>().Object);
Assert.Equal(1, added);
Assert.Equal(0, removed);
observable.Subscribe(new Mock<IObserver<IEvent<EventArgs>>>().Object);
Assert.Equal(1, added);
Assert.Equal(0, removed);
}
public void WhenSourceEventRaisedAndWeakSubscriberDisposed_ThenRemovesSubscriber()
{
EventHandler raiseHandler = null;
var removed = 0;
var observer = new Mock <IObserver <IEvent <EventArgs> > >();
var weakSubscriber = new WeakObserverEvent <EventArgs>(observer.Object.OnNext, observer.Object.OnError, observer.Object.OnCompleted);
var observable = new WeakObservableEvent <EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => raiseHandler = handler,
handler => removed++);
observable.Subscribe(weakSubscriber);
Assert.NotNull(raiseHandler);
Assert.Equal(0, removed);
observer = null;
GC.Collect();
raiseHandler(this, EventArgs.Empty);
Assert.Equal(1, removed);
}
public void WhenSourceEventRaisedAndWeakSubscriberDisposed_ThenRemovesSubscriber()
{
EventHandler raiseHandler = null;
var removed = 0;
var observer = new Mock<IObserver<IEvent<EventArgs>>>();
var weakSubscriber = new WeakObserverEvent<EventArgs>(observer.Object.OnNext, observer.Object.OnError, observer.Object.OnCompleted);
var observable = new WeakObservableEvent<EventHandler, EventArgs>(
handler => new EventHandler(handler.Invoke),
handler => raiseHandler = handler,
handler => removed++);
observable.Subscribe(weakSubscriber);
Assert.NotNull(raiseHandler);
Assert.Equal(0, removed);
observer = null;
GC.Collect();
raiseHandler(this, EventArgs.Empty);
Assert.Equal(1, removed);
}
