public void ChangeProductCount_SetNegativeCount_ThrowArgumentException()
{
var cartManager = new ShoppingCartManager(new CommandManager());
var product = new VanilaCandy(1, "buble", 2M, 10);
cartManager.AddProduct(product);
cartManager.ChangeProductCount(product, 15);
Assert.Throws <ArgumentException>(() => cartManager.ChangeProductCount(product, -5));
}
public void ChangeProductCount_SetCorrectCount_SetNewCount()
{
var cartManager = new ShoppingCartManager(new CommandManager());
var product = new VanilaCandy(1, "buble", 2M, 10);
cartManager.AddProduct(product);
cartManager.ChangeProductCount(product, 15);
Assert.IsTrue(product.Count == 15);
}