Code Retreat

GameOL.rb

require "test/unit"

class World
  def initialize
   @cells = [[false, false, true],
             [false, true, false],
             [false, false, false],
           ]
  end

  def countNeighbours(x, y)
    count = 0
    for i in (x -1)..(x + 1)
      for j in (y -1)..(y+1)
        if (i != x) && (j != y) && @cells[i][j]
          count +=1

      end
      end
    end


    count
  end


  def nextState(isAlive, nbNeighbors)
    return false if isAlive && (nbNeighbors < 2|| nbNeighbors >3)
    return true if isAlive && (nbNeighbors ===2  || nbNeighbors === 3)
    return true if !isAlive && (nbNeighbors == 3 )
  end

  end





class MyTest < Test::Unit::TestCase

  def test_live_cell_dies_with_less_than_two_neighbors
    @world = World.new

    assert_equal @world.nextState(true, 1), false

  end

  def test_live_cell_dies_with_more_than_three_neighbors
    @world = World.new

    assert_equal @world.nextState(true, 4), false

  end


  def test_live_cell_survives_with_two_or_three_neighbors
    @world = World.new

    assert_equal @world.nextState(true, 3), true

  end


  def test_dead_cell_resuscitates_with_three_neighbors
    @world = World.new
    assert_equal @world.nextState(false, 3), true
  end

  def test_count_neighbours
    @world = World.new
    assert_equal @world.countNeighbours(1,1), 1
  end
end