public void DecreaseQualityByDecrement_Old(string itemName, int decrement) { var gildedRose = new GildedRose(TestData.GetItemByNameList(itemName)); gildedRose.UpdateQuality_Old(); Assert.IsTrue(gildedRose.GetItems_Old() != null && gildedRose.GetItems_Old().Count == 1); Assert.AreEqual(TestData.GetItemByName(itemName).Quality - decrement, gildedRose.GetItems_Old().First().Quality); Assert.AreEqual(TestData.GetItemByName(itemName).SellIn - 1, gildedRose.GetItems_Old().First().SellIn); }