// 测试Discount的添加折扣商品函数
@Test
public void AddDiscountItem_and_AddGiveItem() {
Discount dis = Discount.Initial();
dis.ClearDiscount();
dis.AddDiscountItem("ITEM000001");
dis.AddDiscountItem("ITEM000002");
dis.AddGiveItem("ITEM000001");
dis.AddGiveItem("ITEM000003");
PromotionType type1 = dis.IsPromotion("ITEM000001");
assertEquals(type1, PromotionType.BUYTWOGIVEONE);
PromotionType type2 = dis.IsPromotion("ITEM000002");
assertEquals(type2, PromotionType.DISCOUNT);
PromotionType type3 = dis.IsPromotion("ITEM000003");
assertEquals(type3, PromotionType.BUYTWOGIVEONE);
PromotionType type4 = dis.IsPromotion("ITEM000005");
assertEquals(type4, PromotionType.NOPROMOTION);
}
