public void Detach(Shop shop)
{
shops.Remove(shop);
if (priceNotifier == null)
return;
priceNotifier -= new Notifier(shop.Update);
}
public void check_all_the_shops_notified_with_latest_price()
{
Book yaanaBook = new Book();
Shop jayangarShop = new Shop("Jayanagar Shop");
yaanaBook.Attach(jayangarShop);
Shop jpNagarShop = new Shop("JP Nagar Shop");
yaanaBook.Attach(jpNagarShop);
Shop krRoadShop = new Shop("KR Road Shop");
yaanaBook.Attach(krRoadShop);
decimal latestPrice = 250m;
yaanaBook.UpdatePrice(latestPrice);
Assert.AreEqual(latestPrice, jayangarShop.Price);
Assert.AreEqual(latestPrice, jpNagarShop.Price);
Assert.AreEqual(latestPrice, krRoadShop.Price);
}
public void Attach(Shop shop)
{
shops.Add(shop);
priceNotifier += new Notifier(shop.Update);
}