public void TestCaseCart3() { //A = 3, B = 5, C = 1, D = 1 PromotionEngine promotionEngine = new PromotionEngine(); FillCartList3(promotionEngine); decimal orginalPrice = 335m, expectedPrice = 280m; (decimal actualPrice, decimal promoPrice) = promotionEngine.PromoCalculator(); Assert.AreEqual(orginalPrice, actualPrice); Assert.AreEqual(expectedPrice, promoPrice); }