gilded_rose.rb

class GildedRose
  attr_accessor :items
  
  def initialize(items)
    @items = items
  end
  
  def update_quality
  end
end

class Item
  attr_accessor :name, :sell_in, :quality
  
  def initialize(name, sell_in, quality)
    @name, @sell_in, @quality = name, sell_in, quality
  end
end

gilded_rose_spec.rb

describe 'GildedRose' do
  describe '.update_quality' do
    it 'should decrement sell_in by 1'
    it 'should decrement quality by 1'
    
    context 'with a quality of 0 or 50' do
      it 'should not change in quality'
    end
    
    context 'when sell_in is less than zero' do
      it 'should set quality to 0'
    end
    
    context 'when item is Sulfuras, Hand of Ragnaros' do
      it 'should never change quality'
      it 'should never change sell_in'
    end
    
    context 'when item is Aged Brie' do
      context 'with a sell_in greater than zero'
        it 'should not change in quality'
        it 'should decrement sell_in by 1'
      end
      context 'with a sell_in less than or equal to zero'
        it 'should increase quality by 1'
        it 'should decrement sell_in by 1'
      end
    end
    context 'when item is Backstage Passes' do
      context 'when sell_in is between 6-10 days' do
        it 'should increment quality by 2'
      end
      context 'when sell_in is between 0-5 days' do
        it 'should increment quality by 3'
      end
    end
    context 'when item is Conjured' do
      it 'should decrement quality by 2'
    end
  end
end