public void Cart_Can_Compute_Sum() { var pruductsArray = products.Products.ToArray(); Cart target = new Cart(); target.AddItem(pruductsArray[0], 1); target.AddItem(pruductsArray[1], 2); var resultValue = target.ComputeTotalValue(); var resultCount = target.ComputeTotalCount(); var checkresult = pruductsArray[0].Price + pruductsArray[1].Price * 2; Assert.AreEqual(resultValue, checkresult); Assert.AreEqual(resultCount, 3); }