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} )"); }