public void CalculateDeliveryCost_ShouldThrowArgumentNullException_IfParameterNull()
{
Category electronicCategory = new Category(CategoryType.Electronic);
Product television = new Product("Television", 2000, electronicCategory);
ShoppingCart shoppingCart = new ShoppingCart();
DeliveryCostCalculator deliveryCostCalculator = new DeliveryCostCalculator(10, 5, 10, null, new StandardCalculatorStrategy());
shoppingCart.AddProduct(television, 10);
int numberOfProducts = shoppingCart.GetNumberOfProducts();
Assert.Throws <ArgumentNullException>(() => deliveryCostCalculator.CalculateCost());
}
public void CalculateDeliveryCost_ShouldWorkCorrectly_IfStandardAlgorithmApplied()
{
Category electronicCategory = new Category(CategoryType.Electronic);
Product television = new Product("Television", 2000, electronicCategory);
ShoppingCart shoppingCart = new ShoppingCart();
DeliveryCostCalculator deliveryCostCalculator = new DeliveryCostCalculator(10, 5, 10, shoppingCart, new StandardCalculatorStrategy());
shoppingCart.AddProduct(television, 10);
int numberOfProducts = shoppingCart.GetNumberOfProducts();
decimal deliveryCost = deliveryCostCalculator.CalculateCost();
Assert.Equal(25M, deliveryCost);
}