public void Attach_Success()
{
// The client code.
var subject = new Observed(_outputHelper);
var observerA = new ConcreteObserverA(_outputHelper);
subject.Attach(observerA);
var observerB = new ConcreteObserverB(_outputHelper);
subject.Attach(observerB);
Assert.Equal(2, subject.ObserverCount);
}
public void Notification_Success()
{
// The client code.
var subject = new Observed(_outputHelper);
var observerA = new ConcreteObserverA(_outputHelper);
subject.Attach(observerA);
var observerB = new ConcreteObserverB(_outputHelper);
subject.Attach(observerB);
subject.SomeBusinessLogic();
subject.SomeBusinessLogic();
subject.Detach(observerB);
subject.SomeBusinessLogic();
Assert.Equal(5, observerA.NotificationCount + observerB.NotificationCount);
}