url_for scaffold failure

app/controllers/application_controller.rb
------------
class ApplicationController < ActionController::Base
  include SslRequirement
  ssl_exceptions
end

spec/support/authlogic.rb
---------
require "authlogic/test_case"
include Authlogic::TestCase

spec/controllers/scaffold_controller_spec.rb
----------
require 'spec_helper'
describe ScaffoldController do
  before do
    activate_authlogic
    create_and_signin_user!
  end

  def mock_scaffold(stubs={})
    @mock_scaffold ||= mock_model(Scaffold, stubs).as_null_object
  end

  describe "POST create" do
    describe "with valid params" do
      it "redirects to the created scaffold" do
        Scaffold.stub(:new) { mock_scaffold(:save => true) }
        post :create, :scaffold => {}
        response.should redirect_to(scaffold_url(mock_scaffold))
      end
    end
end