public void Can_calculate_discount_amount_fixed()
{
var discount = new Discount()
{
UsePercentage = false,
DiscountAmount = 10
};
discount.GetDiscountAmount(100).ShouldEqual(10);
discount.DiscountAmount = 20;
discount.GetDiscountAmount(200).ShouldEqual(20);
}
public void Can_calculate_discount_amount_percentage()
{
var discount = new Discount()
{
UsePercentage = true,
DiscountPercentage = 30
};
discount.GetDiscountAmount(100).ShouldEqual(30);
discount.DiscountPercentage = 60;
discount.GetDiscountAmount(200).ShouldEqual(120);
}
/// <summary>
/// Gets discount amount
/// </summary>
/// <param name="productVariant">Product variant</param>
/// <param name="customer">The customer</param>
/// <param name="additionalCharge">Additional charge</param>
/// <param name="quantity">Product quantity</param>
/// <param name="appliedDiscount">Applied discount</param>
/// <returns>Discount amount</returns>
public virtual decimal GetDiscountAmount(ProductVariant productVariant,
Customer customer,
decimal additionalCharge,
int quantity,
out Discount appliedDiscount)
{
appliedDiscount = null;
decimal appliedDiscountAmount = decimal.Zero;
//we don't apply discounts to products with price entered by a customer
if (productVariant.CustomerEntersPrice)
return appliedDiscountAmount;
appliedDiscount = GetPreferredDiscount(productVariant, customer, additionalCharge, quantity);
if (appliedDiscount != null)
{
decimal finalPriceWithoutDiscount = GetFinalPrice(productVariant, customer, additionalCharge, false, quantity);
appliedDiscountAmount = appliedDiscount.GetDiscountAmount(finalPriceWithoutDiscount);
}
return appliedDiscountAmount;
}
