refactor

test/AgedBrieTest.cs

@@ -26,15 +26,17 @@ namespace csharpcore
             new object[]{ -1, 1, 3 },
         };
 
-        [Fact]
-        public void ShouldNotIncreaseQualityMoreThan50()
+        [Theory]
+        [InlineData(1, 0)]
+        [InlineData(-1, -2)]
+        public void ShouldNotIncreaseQualityMoreThan50(int startSellInDays, int expectedSellInDays)
         {
-            var item = new Item {Name = "Aged Brie", SellIn = 1, Quality = 50};
+            var item = new Item {Name = "Aged Brie", SellIn = startSellInDays, Quality = 50};
             var app = new GildedRose(new List<Item> {item});
             
             app.UpdateQuality();
             Assert.Equal("Aged Brie", item.Name);
-            Assert.Equal(0, item.SellIn);
+            Assert.Equal(expectedSellInDays, item.SellIn);
             Assert.Equal(50, item.Quality);
         }
     }

test/ConjuredTest.cs

@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+using Xunit;
+
+namespace csharpcore
+{
+    // "Conjured" items degrade in Quality twice as fast as normal items
+    public class ConjuredTest
+    {
+        private readonly List<Item> _items;
+        private GildedRose _rose;
+
+        public ConjuredTest()
+        {
+            _items = new List<Item>();
+            _rose =new GildedRose(_items);
+        }
+
+        //[Fact]
+        public void ShouldDecreaseInQuality()
+        {
+            var item = GenerateItem(3, 2);
+            _items.Add(item);
+
+            _rose.UpdateQuality();
+            Assert.Equal(1, item.Quality);
+            Assert.Equal(1, item.SellIn);
+        }
+        
+        public Item GenerateItem(int quality, int sellInDays) 
+            => new Item {Name = "Conjured Mana Cake", Quality = quality, SellIn = sellInDays};
+    }
+}