public void Compound_Observer()
{
DuckSimulator sim = new DuckSimulator();
Flock flockDucks = new Flock();
IDuckFactory duckFactory = new DuckCounterFactory();
flockDucks.Add(duckFactory.CreateMallardDuck());
flockDucks.Add(duckFactory.CreateRubberDuck());
flockDucks.Add(duckFactory.CreateRedheadDuck());
flockDucks.Add(duckFactory.CreateDuckCall());
flockDucks.Add(new GooseAdapter(new Goose()));
flockDucks.RegisterObservers(new QuackologistObserver());
sim.Simulate(flockDucks);
Assert.AreEqual(4, QuackCounter.GetQuackCount());
}
