diff --git a/ruby/gilded_rose_spec.rb b/ruby/gilded_rose_spec.rb
index 269fe1b0..ecf3e30f 100644
--- a/ruby/gilded_rose_spec.rb
+++ b/ruby/gilded_rose_spec.rb
@@ -1,13 +1,241 @@
-require File.join(File.dirname(__FILE__), 'gilded_rose')
+require File.join(File.dirname(__FILE__), "gilded_rose")
 
 describe GildedRose do
-
   describe "#update_quality" do
+    it "updates sell_in and quality of multiple items" do
+      items = [
+        Item.new("Dark Blade", 2, 3),
+        Item.new("Aged Brie", 2, 3),
+        Item.new("Backstage passes to a TAFKAL80ETC concert", 2, 3)
+      ]
+      GildedRose.new(items).update_quality
+      expect(items[0].sell_in).to eq 1
+      expect(items[0].quality).to eq 2
+      expect(items[1].sell_in).to eq 1
+      expect(items[1].quality).to eq 4
+      expect(items[2].sell_in).to eq 1
+      expect(items[2].quality).to eq 6
+    end
+
     it "does not change the name" do
       items = [Item.new("foo", 0, 0)]
-      GildedRose.new(items).update_quality()
-      expect(items[0].name).to eq "fixme"
+      GildedRose.new(items).update_quality
+      expect(items[0].name).to eq "foo"
+    end
+
+    it "decreases sell_in by 1" do
+      items = [Item.new("Dark Blade", 10, 5)]
+      GildedRose.new(items).update_quality
+      expect(items[0].sell_in).to eq 9
+
+      items = [Item.new("Dark Blade", 0, 5)]
+      GildedRose.new(items).update_quality
+      expect(items[0].sell_in).to eq(-1)
+    end
+
+    it "decreases quality by 1" do
+      items = [Item.new("Dark Sword", 10, 5)]
+      GildedRose.new(items).update_quality
+      expect(items[0].quality).to eq 4
+
+      items = [Item.new("Dark Sword", 1, 5)]
+      GildedRose.new(items).update_quality
+      expect(items[0].quality).to eq 4
+    end
+
+    it "decreases quality down to 0" do
+      items = [Item.new("Dark Sword", 10, 0)]
+      GildedRose.new(items).update_quality
+      expect(items[0].quality).to eq(0)
+    end
+
+    context "sell_in less than 1" do
+      it "decreases quality by 2" do
+        items = [Item.new("Dark Sword", 0, 10)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq(8)
+
+        items = [Item.new("Dark Sword", -1, 10)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq(8)
+      end
+
+      it "decreases quality down to 0" do
+        items = [Item.new("Dark Sword", 0, 0)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq(0)
+
+        items = [Item.new("Dark Sword", 0, 1)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq(0)
+
+        items = [Item.new("Dark Sword", 0, 2)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq(0)
+      end
+    end
+
+    context "when process Aged Brie" do
+      let(:item_name) { "Aged Brie" }
+      it "increases quality by 1" do
+        items = [Item.new(item_name, 10, 5)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq 6
+
+        items = [Item.new(item_name, 1, 5)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq 6
+      end
+
+      it "updates quality up to 50" do
+        items = [Item.new(item_name, 5, 50)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq 50
+      end
+
+      context "when sell_in is less than 1" do
+        it "increases quality by 2" do
+          items = [Item.new(item_name, 0, 5)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 7
+
+          items = [Item.new(item_name, 0, 48)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+        end
+
+        it "updates quality up to 50" do
+          items = [Item.new(item_name, 0, 49)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+
+          items = [Item.new(item_name, 0, 50)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+        end
+      end
+    end
+
+    context "when process Backstage passes to a TAFKAL80ETC concert" do
+      let!(:item_name) { "Backstage passes to a TAFKAL80ETC concert" }
+
+      context "when sell_in is greater than to 10" do
+        it "increases quality by 1" do
+          items = [Item.new(item_name, 11, 5)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 6
+        end
+
+        it "increases quality up to 50" do
+          items = [Item.new(item_name, 11, 50)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+        end
+      end
+
+      context "when sell_in is greater than 5 and less than or equal to 10" do
+        it "increases quality by 2" do
+          items = [Item.new(item_name, 10, 5)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 7
+
+          items = [Item.new(item_name, 6, 5)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 7
+        end
+
+        it "increases quality up to 50" do
+          items = [Item.new(item_name, 10, 48)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+
+          items = [Item.new(item_name, 10, 49)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+
+          items = [Item.new(item_name, 10, 50)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+        end
+      end
+
+      context "when sell_in is less than or equal to 5" do
+        it "increases quality by 3" do
+          items = [Item.new(item_name, 5, 5)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 8
+
+          items = [Item.new(item_name, 5, 0)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 3
+
+          items = [Item.new(item_name, 1, 5)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 8
+        end
+
+        it "increases quality up to 50" do
+          items = [Item.new(item_name, 5, 47)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+
+          items = [Item.new(item_name, 5, 48)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+
+          items = [Item.new(item_name, 5, 49)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+
+          items = [Item.new(item_name, 5, 50)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 50
+        end
+      end
+
+      context "when sell_in is less than or equlal to 0" do
+        it "sets quality to 0" do
+          items = [Item.new(item_name, 0, 5)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 0
+
+          items = [Item.new(item_name, -1, 5)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 0
+
+          items = [Item.new(item_name, 0, 50)]
+          GildedRose.new(items).update_quality
+          expect(items[0].quality).to eq 0
+        end
+      end
+    end
+
+    context "when processing Sulfuras, Hand of Ragnaros" do
+      let(:item_name) { "Sulfuras, Hand of Ragnaros" }
+
+      it "does not change quality" do
+        items = [Item.new(item_name, 1, 50)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq 50
+
+        items = [Item.new(item_name, 0, 5)]
+        GildedRose.new(items).update_quality
+        expect(items[0].quality).to eq 5
+      end
+
+      it "does not change sell_in" do
+        items = [Item.new(item_name, 1, 5)]
+        GildedRose.new(items).update_quality
+        expect(items[0].sell_in).to eq 1
+
+        items = [Item.new(item_name, 0, 5)]
+        GildedRose.new(items).update_quality
+        expect(items[0].sell_in).to eq 0
+
+        items = [Item.new(item_name, -1, 5)]
+        GildedRose.new(items).update_quality
+        expect(items[0].sell_in).to eq(-1)
+      end
     end
   end
-
 end