Improve rspec quality bounds specs

ruby/specs/gilded_rose_spec.rb

@@ -51,12 +51,15 @@ describe GildedRose do
         end
       end
 
+      context 'in all cases' do
+        let(:quality) { 0 }
+
         it 'does never lower the quality below 0' do
-        items = [Item.new(item_name, sell_in, 0)]
-        GildedRose.new(items).update_quality
+          subject.update_quality
           expect(items[0].quality).to eq 0
         end
       end
+    end
 
     context "when item name is 'Sulfuras, Hand of Ragnaros'" do
       let(:item_name) { 'Sulfuras, Hand of Ragnaros' }
@@ -146,12 +149,15 @@ describe GildedRose do
         end
       end
 
+      context 'in all cases' do
+        let(:quality) { 50 }
+
         it 'does never raise the quality above 50' do
-        items = [Item.new(item_name, sell_in, 50)]
-        GildedRose.new(items).update_quality
+          subject.update_quality
           expect(items[0].quality).to eq 50
         end
       end
+    end
 
     context "when item name is 'Backstage passes to a TAFKAL80ETC concert'" do
       let(:item_name) { 'Backstage passes to a TAFKAL80ETC concert' }
@@ -213,12 +219,15 @@ describe GildedRose do
         end
       end
 
+      context 'in all cases' do
+        let(:quality) { 50 }
+
         it 'does never raise the quality above 50' do
-        items = [Item.new(item_name, sell_in, 50)]
-        GildedRose.new(items).update_quality
+          subject.update_quality
           expect(items[0].quality).to eq 50
         end
       end
+    end
 
     context "when item name is 'Conjured Mana Cake'" do
       let(:item_name) { 'Conjured Mana Cake' }
@@ -264,11 +273,14 @@ describe GildedRose do
         end
       end
 
+      context 'in all cases' do
+        let(:quality) { 0 }
+
         it 'does never lower the quality below 0' do
-        items = [Item.new(item_name, sell_in, 0)]
-        GildedRose.new(items).update_quality
+          subject.update_quality
           expect(items[0].quality).to eq 0
         end
       end
     end
+  end
 end