public void AddItemToCart_MutipleCalls_Should_Total()
{
var store = new OnlineStore(new Catalog());
var customerName = CustomerName;
store.CreateShoppingCart(customerName);
store.AddItemToShoppingCart(customerName, ProductTypeEnum.Tent, 3);
store.AddItemToShoppingCart(customerName, ProductTypeEnum.Tent, 2);
Assert.AreEqual(5, store.GetItemCountInCart(customerName, ProductTypeEnum.Tent));
Assert.AreEqual(5 * 50M, store.GetItemInCart(customerName, ProductTypeEnum.Tent).Cost);
}