add tests for backstage items

ruby/spec/gilded_rose_spec.rb

@@ -3,6 +3,7 @@ require 'gilded_rose'
 describe GildedRose do
 let(:potato) { Item.new('potato', 15, 2)}
 let(:sulfarus) { Item.new('Sulfuras, Hand of Ragnaros', 50, 80) }
+
   describe "#update_quality" do
     it "does not change the name" do
       items = [Item.new("foo", 0, 0)]
@@ -53,10 +54,39 @@ let(:sulfarus) { Item.new('Sulfuras, Hand of Ragnaros', 50, 80) }
       it 'does not change' do
         items = [sulfarus]
         GildedRose.update_quality(items)
-        expect(items[0]).to eq sulfarus
+        expect(items[0].quality).to eq 80
+        expect(items[0].sell_in).to eq 50
       end
     end
 
+    describe 'backstage pass input' do
+      it 'increases in quality by one when sellIn is > 10 days' do
+        items = [Item.new("Backstage passes to a TAFKAL80ETC concert", 15, 20)]
+        GildedRose.update_quality(items)
+        expect(items.first.quality).to eq 21
+      end
+
+      it 'increases in quality by 2 when sellin < 10 days' do
+        items = [Item.new("Backstage passes to a TAFKAL80ETC concert", 9, 20)]
+        GildedRose.update_quality(items)
+        expect(items.first.quality).to eq 22
+      end
+
+      it 'increases by 3 when sellin < 5' do
+        items = [Item.new("Backstage passes to a TAFKAL80ETC concert", 4, 20)]
+        GildedRose.update_quality(items)
+        expect(items.first.quality).to eq 23
+      end
+
+      it 'decreases to 0 when sellin == 0' do
+        items = [Item.new("Backstage passes to a TAFKAL80ETC concert", 0, 20)]
+        GildedRose.update_quality(items)
+        expect(items.first.quality).to eq 0
+      end
+    end
+
+  
+ 
 
   end