Acceptance tests for bowling game

line_spec.rb

require_relative 'bowling'

describe Line do

  def roll_balls(line, frames)
    frames.each { |pins| line.knock pins }
  end
  
  def self.should_behave_like_a_bowling_game(result, frames, descr=nil)
    context descr || "when doing a game with #{frames}" do
      before { roll_balls subject, frames}
      its(:score) { should == result }
    end
  end
  
  describe 'border scenarios' do
    should_behave_like_a_bowling_game 0, [0] * 20, 'gutter'
    should_behave_like_a_bowling_game 300, [10] * 12, 'awesome sauce'
  end

  describe 'lame games' do
    should_behave_like_a_bowling_game 20, [1] * 20, 'only ones'
    should_behave_like_a_bowling_game 20, [2, 8, 5] + [0] * 17, 'only one spare'
    should_behave_like_a_bowling_game 26, [10, 3, 5] + [0] * 17, 'only one strike'
  end

  describe 'lots of spares' do
    should_behave_like_a_bowling_game 150, [5] * 20 << 5, '10 pairs of 5 + bonus roll 5'
    should_behave_like_a_bowling_game 195, [10, 5, 5] * 5 << 5, 'strike and pair of 5'
  end

  nine_empty_frames = [0] * 18

  describe 'spare on the 10th frame' do
    should_behave_like_a_bowling_game 12, nine_empty_frames + [2, 8, 2]   , "not a strike"
    should_behave_like_a_bowling_game 20, nine_empty_frames + [2, 8, 10]  , "bonus roll strike"
  end

  describe 'strike on the 10th frame' do
    should_behave_like_a_bowling_game 30, nine_empty_frames + [10, 10, 10], "two bonus roll strikes"
    should_behave_like_a_bowling_game 20, nine_empty_frames + [10, 2, 8]  , "two bonus rolls and a spare"
  end
  
  describe "playing average games" do
    should_behave_like_a_bowling_game 131, [9, 0, 3, 7, 6, 1, 3, 7, 8, 1, 5, 5, 0, 10, 8, 0, 7, 3, 8, 2, 8]
    should_behave_like_a_bowling_game 82,  [9, 0, 3, 5, 6, 1, 3, 6, 8, 1, 5, 3, 2, 5, 8, 0, 7, 1, 8, 1]
    should_behave_like_a_bowling_game 193, [10, 3, 7, 6, 1, 10, 10, 10, 2, 8, 9, 0, 7, 3, 10, 10, 10]
  end

end