public void NotifyObservers_MultipleObserversDetachingOrAttachingOthers_NoUpdatesForAttachedAndDetachedObservers()
{
// Setup
var mocks = new MockRepository();
var testObservable = new TestObservable();
var observer1 = mocks.Stub <IObserver>();
var observer2 = mocks.Stub <IObserver>();
var observer3 = mocks.Stub <IObserver>();
var observer4 = mocks.Stub <IObserver>();
var observer5 = mocks.Stub <IObserver>();
var observer6 = mocks.Stub <IObserver>();
testObservable.Attach(observer1);
testObservable.Attach(observer2);
testObservable.Attach(observer3);
testObservable.Attach(observer4);
testObservable.Attach(observer6);
observer1.Expect(o => o.UpdateObserver());
observer2.Expect(o => o.UpdateObserver()).Do((Action)(() => testObservable.Detach(observer3)));
observer3.Expect(o => o.UpdateObserver()).Repeat.Never(); // A detached observer should no longer be updated
observer4.Expect(o => o.UpdateObserver()).Do((Action)(() => testObservable.Attach(observer5)));
observer5.Expect(o => o.UpdateObserver()).Repeat.Never(); // An attached observer should not be updated too
observer6.Expect(o => o.UpdateObserver());
mocks.ReplayAll();
// Call
testObservable.NotifyObservers();
// Assert
mocks.VerifyAll();
}
public void NotifyObserver_AttachedObserverDetachedAgain_ObserverNoLongerNotified()
{
// Setup
var mocks = new MockRepository();
var observer = mocks.StrictMock <IObserver>();
mocks.ReplayAll();
var observable = new TestObservable();
observable.Attach(observer);
observable.Detach(observer);
// Call
observable.NotifyObservers();
// Assert
mocks.VerifyAll(); // Expect no calls on 'observer'
}
