kata_bowling_game_spec.rb

require File.join(File.dirname(__FILE__), 'kata_bowling_game.rb')

describe Game, "Bowling main game class" do
  let(:game) { Game.new }

  def rolls_many(n, pins)
    n.times { game.roll pins }
  end
  
  def rolls_spare
    game.roll 5
    game.roll 5
  end
  
  def rolls_strike
    game.roll 10
  end

  context "when creates a new game" do
    it "returns an instance of Game" do
      game = Game.new
      game.should be_an_instance_of Game
    end
  end
  
  context "when throw the ball" do
    it "returns 0 if per each throw 0 pins were thrown down" do
      rolls_many 20, 0
      game.score.should == 0
    end
    
    it "returns 20 if per each throw 1 pin were thrown down" do
      rolls_many 20, 1
      game.score.should == 20
    end
  end

  context "when thrown all pins with a spare" do
    it "returns the right score with the bonus spare" do
      rolls_spare
      game.roll 3
      rolls_many 17, 0
      game.score.should == 16
    end
  end
  
  context "when thrown all pins with a strike" do
    it "returns the right score with the bonus strike" do
      rolls_strike
      game.roll 3
      game.roll 4
      rolls_many 16, 0
      game.score.should == 24
    end
  end
  
  context "when play a perfect game" do
    it "returns 300 points" do
      rolls_many 12, 10
      game.score.should == 300
    end
  end
end