gistfile1.rb

class Item
  def does_something
    PublishingHouse.new(@document).publish
  end
end

it 'publishes the document' do
  publishing_house = stub('PublishingHouse')
  publishing_house.should_receive(:publish).once
  PublishingHouse.should_receive(:new).with(document) { publishing_house }

  Item.new(document).does_something
end