Quine in Ruby

quine.rb

s=%q(;puts "s=%q(#{s})"+s);puts "s=%q(#{s})"+s

quine_spec.rb

require 'rspec'
require_relative 'quine'

describe "quine" do
  it "output equals its code" do |variable|
    f = File.open("quine.rb")
    f.read.should == `ruby quine.rb`
  end
end