class CardboardBox
  def initialize(transmogrifier)
    @transmogrifier = transmogrifier
  end
  
  def poke
    @transmogrifier.transmogrify
  end
end

Given /^I have a cardboard box$/ do
  transmogrifier = double('transmogrifier')
  transmogrifier.should_receive(:transmogrify)
  @box = CardboardBox.new(transmogrifier)
end

When /^I poke it all is good$/ do
  @box.poke
end