This is the rspec file of my project

game.rb

class Game
  attr_accessor :grid
  
  def initialize
    @grid = Hash.new
    @moves = 0
    9.times { |time| grid[time+1] = nil }
  end

  def mark(space, marker)
    @grid[space] = marker
  end

  def move
    result = @moves % 2 == 0 ? :X : :Y
    @moves += 1
  
    result
  end
end

game_spec.rb

$LOAD_PATH << './app'
require 'rspec'
require 'game'

#Tic-tac-Toe Game TDD
describe Game do
  before { @game = Game.new }
  
  subject { @game }

  context "with nine spaces grid" do
  	subject { @game.grid.size }
  	it { should be 9}
  end

  describe :mark do
  	subject { @game.grid[1] }

    context "mark a space with X" do
      before { @game.mark(1, :X) }
      it { should be :X }
    end

    context "mark a space with Y" do
      before { @game.mark(1, :Y) }
      it { should be :Y }
    end
  end

  describe :move do
    subject { @game.move }

    context "when an user does a first move" do
  	  it { should be :X }
    end

    context "when an user does a next move after X move" do
    	before { @game.move }
    	it { should be :Y }
    end

    context "when an user does a next move after Y move" do
    	before { 2.times { @game.move } }
    	it { should be :X }
    end
  end

  describe :winner do
  	subject { @game.get_winner }

    #123
    context "when three X marks are placing horizontal in a row" do
    	before do
	    	@game.mark(1, :X)
	    	@game.mark(2, :X)
	    	@game.mark(3, :X)
    	end
    	it { should be :X }
    end

    #456
    context "when three X marks are placing horizontal in a row" do
    	before do
	    	@game.mark(4, :X)
	    	@game.mark(5, :X)
	    	@game.mark(6, :X)
    	end
    	it { should be :X }
    end
  end

end