public void RemoveDiscount() { Discount expected = new Discount("D104", DiscountTypeEnum.Hidden, DateTime.Parse("01/01/2018"), DateTime.Parse("31/12/2018"), 50, true); handler.AddDiscount(expected); Discount find = handler.GetDiscount("D104"); Assert.IsTrue(expected.Equals(find)); handler.RemoveDiscount(expected); find = handler.GetDiscount("D104"); Assert.IsNull(find); }