How can I spec before_filters?

I want to spec my controllers before_filter with rspec. I thought to use ActionController::Testing::ClassMethods#before_filters for it.

I got these results in my rails c:

2.0.0p353 :006 > ActionController::Base.singleton_class.send :include, ActionController::Testing::ClassMethods
2.0.0p353 :003 > EquipmentController.before_filters

=> [:process_action, :process_action]

But in reality this is the filter on my action:

class EquipmentController < ApplicationController
  before_filter :authenticate_user!

Any ideas?