public void CalculateNewSellIn_DifferentParameters_ReturnGoodResult(string itemName, int itemSellIn, int expectedNewSellInResult)
        {
            GildedRose gildeRose = new GildedRose(Items);
            int        result    = gildeRose.CalculateNewSellIn(itemName, itemSellIn);

            Assert.AreEqual(expectedNewSellInResult, result, $"CalculateNewSellIn(): expected {expectedNewSellInResult}; got {result}; parameters ( itemName {itemName}; itemSellIn {itemSellIn} )");
        }