gilded_rose.rb

require './gilded_rose.rb'
require "rspec"

describe GildedRose do

  before do
    @gilded_rose = GildedRose.new
  end

  describe "Sulfuras, Hand of Ragnaros" do
    before { @name = "Sulfuras, Hand of Ragnaros" }

    it "should not update the quality of the hand of ragnaros" do
      items = get_items(@gilded_rose)
      old_item_quality = get_item(items, @name).quality
      @gilded_rose.update_quality
      items = get_items(@gilded_rose)
      item_quality = get_item(items, @name).quality
      old_item_quality.should == item_quality
    end

    it "should not change the sell in" do
      @gilded_rose.update_quality
      items = get_items(@gilded_rose)
      get_item(items, @name).sell_in.should == 0
    end
  end

  describe "Dexterity Vest" do
    before { @name = "+5 Dexterity Vest" }

    it "should change the quality of the dexterity vest" do
      @gilded_rose.update_quality
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 19
      item.sell_in.should == 9
    end

    it "should decrease quality by 10 after 10 days of not selling the dexterity vest" do
      10.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 10
      item.sell_in.should == 0
    end

    it "should decrease quality by 12 after 11 days of not selling the dexterity vest" do
      items = get_items(@gilded_rose)
      old_item_quality = get_item(items, @name).quality
      11.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 8
      item.sell_in.should == -1
    end

    it "should decrease quality to 0 after 20 days of not selling the dexterity vest" do
      20.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 0
      item.sell_in.should == -10
    end
  end

  describe "Aged Brie" do
    before { @name = "Aged Brie" }
    it "should increase the quality of the aged brie after a day" do
      @gilded_rose.update_quality
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 1
      item.sell_in.should == 1
    end

    it "should have quality of 4 after 3 days" do
      3.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 4
      item.sell_in.should == -1
    end

    it "should have quality of 50 after 30 days" do
      30.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item_quality = get_item(items, @name).quality
      item_quality.should == 50
    end
  end

  describe "Elixir of the Mongoose" do
    before { @name = "Elixir of the Mongoose" }
    it "should decrease the quality by 1 after a day" do
      @gilded_rose.update_quality
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 6
      item.sell_in.should == 4
    end

    it "should have a quality of 0 after 6 days" do
      6.times {@gilded_rose.update_quality}
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 0
      item.sell_in.should == -1
    end

    it "should have a quality of 0 after 7 days" do
      7.times {@gilded_rose.update_quality}
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 0
      item.sell_in.should == -2
    end
  end

  describe "Backstage passes" do
    before { @name = "Backstage passes to a TAFKAL80ETC concert" }

    it "should increase the quality to 21 after 1 day" do
      @gilded_rose.update_quality
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 21
      item.sell_in.should == 14
    end

    it "should increase the quality to 27 after 6 days" do
      6.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 27
      item.sell_in.should == 9
    end

    it "should increase the quality to 27 after 11 days" do
      11.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 38
      item.sell_in.should == 4
    end

    it "should be worth 50 after 15 days" do
      15.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 50
      item.sell_in.should == 0
    end

    it "should be worthless after 16 days" do
      16.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 0
      item.sell_in.should == -1
    end
  end

  describe "Conjured Mana Cake" do
    before { @name = "Conjured Mana Cake" }
    it "should decrease in quality by 2 after 1 day" do
      @gilded_rose.update_quality
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 4
      item.sell_in.should == 2
    end

    before { @name = "Conjured Mana Cake" }
    it "should decrease in quality by 6 after 3 days" do
      3.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 0
      item.sell_in.should == 0
    end

    before { @name = "Conjured Mana Cake" }
    it "should decrease in quality by 6 after 4 days" do
      4.times { @gilded_rose.update_quality }
      items = get_items(@gilded_rose)
      item = get_item(items, @name)
      item.quality.should == 0
      item.sell_in.should == -1
    end


  end

  private

  def get_items(rose)
    rose.instance_variable_get("@items")
  end

  def get_item(items, name)
    items.detect { |i| i.name == name}
  end

end