diff --git a/GildedRose.cs b/GildedRose.cs
index b2115f5..36e3ecf 100644
--- a/GildedRose.cs
+++ b/GildedRose.cs
@@ -45,9 +45,8 @@ namespace csharpcore
 
         private static void UpdateConjuredCake(Item item)
         {
-            // TODO
-            // Decrease quality twice when sell date is passed
-            var qualityDecrement = item.SellIn > 0 ? 1 : 2;
+            // Decrease quality twice as fast as normal items
+            var qualityDecrement = item.SellIn > 0 ? 2 : 4;
             item.Quality = Math.Max(item.Quality - qualityDecrement, 0);
         }
 
diff --git a/test/ApprovalTest.ThirtyDays.approved.txt b/test/ApprovalTest.ThirtyDays.approved.txt
index cd66984..f80af4e 100644
--- a/test/ApprovalTest.ThirtyDays.approved.txt
+++ b/test/ApprovalTest.ThirtyDays.approved.txt
@@ -21,7 +21,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 14, 21
 Backstage passes to a TAFKAL80ETC concert, 9, 50
 Backstage passes to a TAFKAL80ETC concert, 4, 50
-Conjured Mana Cake, 2, 5
+Conjured Mana Cake, 2, 4
 
 -------- day 2 --------
 name, sellIn, quality
@@ -33,7 +33,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 13, 22
 Backstage passes to a TAFKAL80ETC concert, 8, 50
 Backstage passes to a TAFKAL80ETC concert, 3, 50
-Conjured Mana Cake, 1, 4
+Conjured Mana Cake, 1, 2
 
 -------- day 3 --------
 name, sellIn, quality
@@ -45,7 +45,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 12, 23
 Backstage passes to a TAFKAL80ETC concert, 7, 50
 Backstage passes to a TAFKAL80ETC concert, 2, 50
-Conjured Mana Cake, 0, 3
+Conjured Mana Cake, 0, 0
 
 -------- day 4 --------
 name, sellIn, quality
@@ -57,7 +57,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 11, 24
 Backstage passes to a TAFKAL80ETC concert, 6, 50
 Backstage passes to a TAFKAL80ETC concert, 1, 50
-Conjured Mana Cake, -1, 1
+Conjured Mana Cake, -1, 0
 
 -------- day 5 --------
 name, sellIn, quality
diff --git a/test/ConjuredTest.cs b/test/ConjuredTest.cs
index 93760b3..78c7ec4 100644
--- a/test/ConjuredTest.cs
+++ b/test/ConjuredTest.cs
@@ -15,17 +15,20 @@ namespace csharpcore
             _rose =new GildedRose(_items);
         }
 
-        //[Fact]
-        public void ShouldDecreaseInQuality()
+        [Theory]
+        [InlineData(3, 2, 1)]
+        [InlineData(5, 1, 3)]
+        [InlineData(5, 0, 1)]
+        public void ShouldDecreaseInQualityTwiceAsFastAsNormalItems(int inQuality, int sellInDays, int expectedQuality)
         {
-            var item = GenerateItem(3, 2);
+            var item = GenerateItem(inQuality, sellInDays);
             _items.Add(item);
 
             _rose.UpdateQuality();
-            Assert.Equal(1, item.Quality);
-            Assert.Equal(1, item.SellIn);
+            Assert.Equal(sellInDays - 1, item.SellIn);
+            Assert.Equal(expectedQuality, item.Quality);
         }
-        
+
         public Item GenerateItem(int quality, int sellInDays) 
             => new Item {Name = "Conjured Mana Cake", Quality = quality, SellIn = sellInDays};
     }