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class User

  MIN_RANK = -8
  MAX_RANK = 8
  RANKS = (MIN_RANK..MAX_RANK).to_a - [0]  
  REWARDS = {-2 => 0, -1 => 1, 0 => 3}

  attr_reader :rank, :progress

  def initialize

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class Cell

  attr_accessor :value

  def empty?
    @value.nil?
  end

  def possible_values(neighbours)
    (1..9).to_a - neighbours

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describe Array do

  it 'should know its size' do
    array = [1,2,3,4]
    array.size.should eq(4)
  end

  it 'should be created with default value' do
    array = Array.new(3) { "fizz" }

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class PoliteMailer

  def send(to)
		message = %Q[message for #{to}
		Hello,
		How are you today?
		I just had a great idea:
		#{yield}
		Hope to hear from you soon
		Best regards

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class Bitcoin

  def initialize
		@observers = Hash.new
		# {:coin_mined => [handler_block1, handler_block2]}
	end

	def mine!		
		100.times do |i|
			trigger(:coin_mined, i) if i % 13 == 0

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require 'minitest/autorun'
require '../lib/tic_tac_toe'

class TicTacToeTest < Minitest::Test

  # the board is represented as a string of rows, e.g.
  # X |   | X
  # ---------
  # 0 | 0 | X
  # ---------

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class AirportTest

  def setup
    @airport = Airport.new    
  end

  def test_plane_can_land   
  end

  # A plane currently in the airport can be requested to take off.