door.rb

class Door
  def self.awesome?
    "FUCK YEAH!"
  end
  
  attr_accessor :color
  
  def initialize
    @color = :white
  end
  
  def paint color
    @color = color
  end
end

door_spec.rb

require 'door'

describe Door do
  it "should be fucking awesome" do
    Door.should be_awesome
  end
  
  describe "painting" do
    before(:each) do
      @door = Door.new
    end
    
    it "should have a color" do
      @door.color.should_not be_nil
    end
    
    it "should be paintable" do
      @door.paint :red
      @door.color.should == :red
    end
  end
end