public void DegradeConjuredItem()
        {
            var item = new Item {
                Name = "Conjured", SellIn = 1, Quality = 5
            };
            var app = new GildedRose(null);

            // Check decreases by 2
            app.DegradeConjuredItem(item);

            Assert.AreEqual(3, item.Quality);
            Assert.AreEqual(0, item.SellIn);

            // Check decreases by 4 after sellin
            app.DegradeConjuredItem(item);

            Assert.AreEqual(0, item.Quality);
            Assert.AreEqual(-1, item.SellIn);
        }