public void TestRemovingAProductNotifesAllObservers()
{
ProductStock productStock = new ProductStock();
MockProductStockObserver mockProductStockObserverOne = new MockProductStockObserver();
MockProductStockObserver mockProductStockObserverTwo = new MockProductStockObserver();
productStock.RegisterObserver(mockProductStockObserverOne);
productStock.RegisterObserver(mockProductStockObserverTwo);
productStock.Remove(Products.Cola);
Assert.AreEqual(1, mockProductStockObserverOne.NumberOfTimesProductStockUpdatedWasCalled);
Assert.AreEqual(Products.Cola, mockProductStockObserverOne.LastProductPassedToProductStockUpdated);
Assert.AreEqual(1, mockProductStockObserverTwo.NumberOfTimesProductStockUpdatedWasCalled);
Assert.AreEqual(Products.Cola, mockProductStockObserverTwo.LastProductPassedToProductStockUpdated);
productStock.Remove(Products.Candy);
Assert.AreEqual(2, mockProductStockObserverOne.NumberOfTimesProductStockUpdatedWasCalled);
Assert.AreEqual(Products.Candy, mockProductStockObserverOne.LastProductPassedToProductStockUpdated);
Assert.AreEqual(2, mockProductStockObserverTwo.NumberOfTimesProductStockUpdatedWasCalled);
Assert.AreEqual(Products.Candy, mockProductStockObserverTwo.LastProductPassedToProductStockUpdated);
}
public void TestRegisterObserverAddsObserverToList()
{
ProductStock productStock = new ProductStock();
List <IProductStockObserver> productStockObservers = productStock.Observers;
Assert.AreEqual(0, productStockObservers.Count);
productStock.RegisterObserver(new MockProductStockObserver());
Assert.AreEqual(1, productStockObservers.Count);
}
public void TestHandlesUnknownProductsGracefully()
{
MockProduct mockProduct = new MockProduct();
ProductStock productStock = new ProductStock();
MockProductStockObserver mockProductStockObserver = new MockProductStockObserver();
productStock.RegisterObserver(mockProductStockObserver);
productStock.Remove(mockProduct);
Assert.AreEqual(0, productStock.Count(mockProduct));
Assert.AreEqual(0, mockProductStockObserver.NumberOfTimesProductStockUpdatedWasCalled);
}