public void MoveForwardOneDay(int startingSellIn, int startingQuality, int resultSellIn, int resultQuality)
        {
            BackStagePasses backstagepasses = new BackStagePasses()
            {
                SellIn = startingSellIn, Quality = startingQuality
            };

            backstagepasses.MoveForwardOneDay();

            int expectedQuality = backstagepasses.Quality;
            int sellin          = backstagepasses.SellIn;

            Assert.That(sellin, Is.EqualTo(resultSellIn));
            Assert.That(expectedQuality, Is.EqualTo(resultQuality));
        }
 /// <summary>
 /// Initializes a new instance of BackStagePassesUpdateStrategy class.
 /// </summary>
 /// <param name="item">Item type.</param>
 public BackStagePassesUpdateStrategy(BackStagePasses item)
 {
     _item = item;
 }