diff --git a/ruby/gilded_rose_spec.rb b/ruby/gilded_rose_spec.rb
index 269fe1b0..1dddb62a 100644
--- a/ruby/gilded_rose_spec.rb
+++ b/ruby/gilded_rose_spec.rb
@@ -1,13 +1,244 @@
 require File.join(File.dirname(__FILE__), 'gilded_rose')
 
 describe GildedRose do
+  subject { Item.new(name: name, sell_in: sell_in, quality: quality) }
 
-  describe "#update_quality" do
-    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"
+  let(:items) { [subject] }
+
+  describe '#update_quality' do
+    let(:sell_in) { 0 }
+    let(:quality) { 0 }
+
+    before do
+      GildedRose
+      .new(items: items)
+      .update_quality
+    end
+
+    shared_examples :does_not_change_the_name do
+      describe '#items' do
+        describe '#first' do
+          describe '#name' do
+            it { expect(subject.name).to eq(name) }
+          end
+        end
+      end
+    end
+
+    context 'when #name is any_other' do
+      let(:name) { 'any_other' }
+
+      it_behaves_like :does_not_change_the_name
+
+      context 'when sell_in is negative' do
+        let(:sell_in) { -42 }
+
+        it { expect(subject.sell_in).to eq(-43) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(48) }
+        end
+      end
+
+      context 'when sell_in is 4' do
+        let(:sell_in) { 4 }
+
+        it { expect(subject.sell_in).to eq(3) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(49) }
+        end
+      end
+
+      context 'when sell_in is 8' do
+        let(:sell_in) { 8 }
+
+        it { expect(subject.sell_in).to eq(7) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(49) }
+        end
+      end
+
+      context 'when sell_in is 12' do
+        let(:sell_in) { 12 }
+
+        it { expect(subject.sell_in).to eq(11) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(49) }
+        end
+      end
+    end
+
+    context 'when #name is Aged Brie' do
+      let(:name) { 'Aged Brie' }
+
+      it_behaves_like :does_not_change_the_name
+
+      context 'when sell_in is negative' do
+        let(:sell_in) { -42 }
+
+        it { expect(subject.sell_in).to eq(-43) }
+        it { expect(subject.quality).to eq(2) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+
+      context 'when sell_in is 4' do
+        let(:sell_in) { 4 }
+
+        it { expect(subject.sell_in).to eq(3) }
+        it { expect(subject.quality).to eq(1) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+
+      context 'when sell_in is 8' do
+        let(:sell_in) { 8 }
+
+        it { expect(subject.sell_in).to eq(7) }
+        it { expect(subject.quality).to eq(1) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+
+      context 'when sell_in is 12' do
+        let(:sell_in) { 12 }
+
+        it { expect(subject.sell_in).to eq(11) }
+        it { expect(subject.quality).to eq(1) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+    end
+
+    context 'when #name is Sulfuras, Hand of Ragnaros' do
+      let(:name) { 'Sulfuras, Hand of Ragnaros' }
+
+      it_behaves_like :does_not_change_the_name
+
+      context 'when sell_in is negative' do
+        let(:sell_in) { -42 }
+
+        it { expect(subject.sell_in).to eq(-42) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+
+      context 'when sell_in is 4' do
+        let(:sell_in) { 4 }
+
+        it { expect(subject.sell_in).to eq(4) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+
+      context 'when sell_in is 8' do
+        let(:sell_in) { 8 }
+
+        it { expect(subject.sell_in).to eq(8) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+
+      context 'when sell_in is 12' do
+        let(:sell_in) { 12 }
+
+        it { expect(subject.sell_in).to eq(12) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+    end
+
+    context 'when #name is Backstage passes to a TAFKAL80ETC concert' do
+      let(:name) { 'Backstage passes to a TAFKAL80ETC concert' }
+
+      it_behaves_like :does_not_change_the_name
+
+      context 'when sell_in is negative' do
+        let(:sell_in) { -42 }
+
+        it { expect(subject.sell_in).to eq(-43) }
+        it { expect(subject.quality).to eq(0) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(0) }
+        end
+      end
+
+      context 'when sell_in is 4' do
+        let(:sell_in) { 4 }
+
+        it { expect(subject.sell_in).to eq(3) }
+        it { expect(subject.quality).to eq(3) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+
+      context 'when sell_in is 8' do
+        let(:sell_in) { 8 }
+
+        it { expect(subject.sell_in).to eq(7) }
+        it { expect(subject.quality).to eq(2) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
+
+      context 'when sell_in is 12' do
+        let(:sell_in) { 12 }
+
+        it { expect(subject.sell_in).to eq(11) }
+        it { expect(subject.quality).to eq(1) }
+
+        context 'when quality is >= 50' do
+          let(:quality) { 50 }
+          it { expect(subject.quality).to eq(50) }
+        end
+      end
     end
   end
-
 end