public void TestClearNotifiesObservers()
{
CoinPurse coinPurse = new CoinPurse();
MockCoin mockCoin = new MockCoin();
MockCoinPurseObserver mockCoinPurseObserver = new MockCoinPurseObserver();
coinPurse.RegisterObserver(mockCoinPurseObserver);
coinPurse.Clear();
Assert.AreEqual(1, mockCoinPurseObserver.NumberOfTimesCoinPurseUpdatedCalled);
}
public void TestRegisterObserverAddsToObserverList()
{
CoinPurse coinPurse = new CoinPurse();
MockCoinPurseObserver mockCoinPurseObserver = new MockCoinPurseObserver();
coinPurse.RegisterObserver(mockCoinPurseObserver);
Assert.AreEqual(1, coinPurse.Observers.Count);
Assert.AreEqual(mockCoinPurseObserver, coinPurse.Observers[0]);
}
public void TestUpdatesOberserversWhenCoinIsAddedToCoinPurse()
{
CoinPurse coinPurse = new CoinPurse();
MockCoinPurseObserver mockCoinPurseObserverOne = new MockCoinPurseObserver();
MockCoinPurseObserver mockCoinPurseObserverTwo = new MockCoinPurseObserver();
coinPurse.RegisterObserver(mockCoinPurseObserverOne);
coinPurse.RegisterObserver(mockCoinPurseObserverTwo);
coinPurse.AddCoin(new MockCoin());
Assert.AreEqual(1, mockCoinPurseObserverOne.NumberOfTimesCoinPurseUpdatedCalled);
Assert.AreEqual(1, mockCoinPurseObserverTwo.NumberOfTimesCoinPurseUpdatedCalled);
}