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)]
      GildedRose.update_quality(items)
      expect(items[0].name).to eq "foo"
    end
    describe 'non-special item input' do
      it 'should decrese the quality of normal item' do
        items = [potato]
        GildedRose.update_quality(items)
        expect(items.first.quality).to eq (1)
      end

      it 'should decrese the sellIn of normal item' do
        items = [potato]
        GildedRose.update_quality(items)
        expect(items.first.sell_in).to eq (14)
      end

      it 'should decrease quality of normal items by 2 when sell_in date passes' do
        items = [Item.new("old potato", 0, 20)]
        GildedRose.update_quality(items)
        expect(items.first.quality).to eq (18)
      end

      it 'should not decrease quality below 0' do
        items = [Item.new("old potato", 0, 0)]
        GildedRose.update_quality(items)
        expect(items.first.quality).to eq (0)
      end
    end

    describe 'Aged Brie input' do
      it 'increases in quality as it ages' do
        items = [Item.new("Aged Brie", 25, 45)]
        GildedRose.update_quality(items)
        expect(items.first.quality).to eq 46
      end

      it 'cannot increase in quality beyond 50' do
        items = [Item.new("Aged Brie", 25, 50)]
        GildedRose.update_quality(items)
        expect(items.first.quality).to eq 50
      end
    end

    describe 'Sulfuras input' do
      it 'does not change' do
        items = [sulfarus]
        GildedRose.update_quality(items)
        expect(items[0]).to eq sulfarus
      end
    end
 

  end

end