Pacman Code Kata for Austin.rb with @timtyrell and @ceez

pacman_kata.rb

class GameBoard
  attr_accessor :game_grid
  def initialize
    @game_grid = [%w[. . .], %w[. . .], %w[. . .]]
    @pacman = Pacman.new
    @pacman_location = [1,1]
  end

  def place_pacman
    game_grid[@pacman_location[0]][@pacman_location[1]] = Pacman::STATES[@pacman.current_direction]
  end

  def tick(command)
    case command
    when :up
      @pacman.current_direction = :up
      game_grid[@pacman_location[0]][@pacman_location[1]] = " "
      @pacman_location[0] -= 1
    when :down
      @pacman.current_direction = :down
      game_grid[@pacman_location[0]][@pacman_location[1]] = " "
      @pacman_location[0] += 1
    end
    place_pacman
  end
end

class Pacman
  attr_accessor :current_direction

  STATES = {up: "V", down: "^", left: ">", right: "<" }

  def initialize
    @current_direction = :up
  end
end

describe "grid" do
  before(:each) do
    @grid = GameBoard.new
  end

  it "renders a field of dots" do
    @grid.game_grid.should == [[".", ".", "."], [".", ".", "."], [".", ".", "."]]
  end

  describe "#place_pacman" do
    it "places a pacman" do
      @grid.place_pacman
      @grid.game_grid.should == [[".", ".", "."], [".", "V", "."], [".", ".", "."]]
    end
  end

  describe "#tick" do
    context "gives command up" do
      it "moves pacman north" do
        @grid.place_pacman
        @grid.tick(:up)
        @grid.game_grid.should == [[".", "V", "."], [".", " ", "."], [".", ".", "."]]
      end
    end

    context "gives command up" do
      it "moves pacman north" do
        @grid.place_pacman
        @grid.tick(:down)
        @grid.game_grid.should == [[".", ".", "."], [".", " ", "."], [".", "^", "."]]
      end
    end
  end
end