working code for the "Rails 3 in action" ebook ( chapter 2 - section 2.3.1 )

bacon.rb

class Bacon
  attr_accessor :expired
  
  def edible?
    !expired
  end
  
  def expired!
    self.expired = true
  end
end

bacon_spec.rb

require 'spec_helper'

describe Bacon do
  
  subject{Bacon.new}
  its(:edible?) { should be_true }

  it "expired!" do
    subject.expired!
    subject.should_not be_edible
  end
  
end

spec_helper.rb

require 'bacon'