This is the code from my first remote pair programming session with @marksim. It was a TDD session of tic tac toe

gistfile1.txt

require 'rspec'

# Tic Tac Toe 
#   is a game
#   where two players

class Player
  attr_accessor :moves
  def initialize
    @moves = []
  end

  def clear_moves
    @moves = []
  end

  def play(x,y)
    if x < 0 || x > 2  ||  y < 0 || y > 2
      return false
    end
    unless @moves.include?([x, y])
      @moves << [x, y]
      true
    else
      false
    end
  end

  def winner?
    if row_winner || column_winner
      true
    else
      false
    end
  end

  private

  def column_winner
    (0..2).each do |column|
      return true if @moves.select {|move| move.last == column}.count == 3
    end
    false
  end

  def row_winner
    (0..2).each do |row|
      return true if @moves.select {|move| move.first == row }.count == 3
    end
    false
  end
end


describe 'Tic Tac Toe' do
  describe 'Player' do
    let(:player) { Player.new }
    before(:each) do
      player.clear_moves
    end
    it "can place a marker on the board" do
      player.play(1, 1).should be_true
    end
    it "can't play the same place twice" do
      player.play(1, 1).should be_true
      player.play(1, 1).should be_false
    end
    it "can't play outside the 3x3 board" do
      player.play(-1, 0).should be_false
      player.play(0, -1).should be_false
      player.play(3, 0).should be_false
      player.play(0, 3).should be_false
    end
    it "wins if top row is filled" do
      player.play(0, 0)
      player.play(0, 1)
      player.play(0, 2)

      player.should be_winner
    end
    it "is not a winner when less than 3 markers are on the board" do
      player.play(1, 1)
      player.should_not be_winner
    end
    it "is not a winner if all 3 markers are not in a row " do
      player.play(0, 0)
      player.play(1, 0)
      player.play(0, 2)

      player.should_not be_winner
    end
    it "wins if the left column is filled" do
      player.play(0, 0)
      player.play(1, 0)
      player.play(2, 0)

      player.should be_winner
    end
  end 
end