gistfile1.rb

describe World do
  it "should return no cell on a new board" do
    w = World.new
    w.cell_at(2,2).should be_nil
  end 
  it "should allow cell creation" do
    w = World.new
    w.make_cell(2,2)
    w.cell_at(2,2).should be_kind_of(Cell)
  end 
end


class World
  def initialize
    @calls =0
  end 
  def cell_at(x,y)
    return nil if @calls == 0
    Cell.new
  end 

  def make_cell(x,y)
    @calls += 1
    Cell.new
  end 
end