public void CalculateReducePrice_MoreMeetProductQuantity_HasReducePrice()
{
const int QUANTITY = 10;
const int MEETQUANTITY = 20;
const int FREEQUANTITY = 15;
const decimal UNIT_PRICE_PRODUCT1 = 10;
const decimal UNIT_PRICE_PRODUCT2 = 20;
const decimal UNIT_PRICE_PRODUCT3 = 30;
var promotion = new PromotionRuleBuyMoreSomeFree("promotionId", "title", MEETQUANTITY, FREEQUANTITY);
promotion.JoinProduct("productId1", "productName");
promotion.JoinProduct("productId2", "productName");
promotion.JoinProduct("productId3", "productName");
Assert.AreEqual(true, promotion.IsExistedProduct("productId1"));
Assert.AreEqual(true, promotion.IsExistedProduct("productId2"));
Assert.AreEqual(true, promotion.IsExistedProduct("productId3"));
List <BoughtProduct> products = new List <BoughtProduct>
{
new BoughtProduct("productId1", QUANTITY, UNIT_PRICE_PRODUCT1, 0, null, null),
new BoughtProduct("productId2", QUANTITY, UNIT_PRICE_PRODUCT2, 0, null, null),
new BoughtProduct("productId3", QUANTITY, UNIT_PRICE_PRODUCT3, 0, null, null)
};
var reducePrice = promotion.CalculateReducePrice(products);
Assert.AreEqual(UNIT_PRICE_PRODUCT1 * QUANTITY + UNIT_PRICE_PRODUCT2 * (FREEQUANTITY - QUANTITY), reducePrice);
}
public void CalculateReducePrice_BoughtProductIsNull_ReducePriceZero()
{
var promotion = new PromotionRuleBuyMoreSomeFree("promotionId", "title", 20, 15);
promotion.JoinProduct("productId1", "productName");
promotion.JoinProduct("productId2", "productName");
promotion.JoinProduct("productId3", "productName");
Assert.AreEqual(true, promotion.IsExistedProduct("productId1"));
Assert.AreEqual(true, promotion.IsExistedProduct("productId2"));
Assert.AreEqual(true, promotion.IsExistedProduct("productId3"));
var reducePrice = promotion.CalculateReducePrice(null);
Assert.AreEqual(0, reducePrice);
}