public void CalculateTotalOrderAmount_Input1() { var cartItmes = new List <Cart>() { new Cart() { Quantity = 1, SkuId = 'A' }, new Cart() { Quantity = 1, SkuId = 'B' }, new Cart() { Quantity = 1, SkuId = 'C' } }; var result = promotionEngine.CalculateTotalOrderAmount(cartItmes); Assert.AreEqual(100, result); }