/// <summary>
/// Add some albums to the specified user's cart.
/// </summary>
public static MvcMusicStore.Models.ShoppingCart AddItemsToCart(string userName, IEnumerable<Album> albums)
{
var cart = new MvcMusicStore.Models.ShoppingCart { ShoppingCartId = userName };
cart.EmptyCart();
foreach (var album in albums)
cart.AddToCart(album);
return cart;
}