Functional Test - assert_raise exception gives headache !

in one of my functional test, I check the followoing :

def test_user_should_not_show_documents
    login_as (:quentin)
    assert_raise (Exceptions::SecurityTransgression) { get :show, :id
=> 2, :franchise_id => 3 }
end

In my controller , I wrote :

  before_filter :login_required
  before_filter :find_parent
def show
   raise SecurityTransgression unless @parent.can_be_edited_by?
(current_user)
   @document = Document.find(params[:id].to_i)
.....
  end

I wrote the exception class and rescue action in my application.rb
class SecurityTransgression < StandardError; end

class ApplicationController < ActionController::Base
  include AuthenticatedSystem
...
  def rescue_action_locally(exception)
    begin
      case exception
      when ::Exceptions::SecurityTransgression
          render :file => "#{RAILS_ROOT}/public/403.html", :status =>
403
......
end

in testing, the exception is raised, (as @parent cannot be edited by
the current_user... I checked it...) the log gives a failure I cannot
explain :

1) Failure:
test_user_should_not_show_documents(DocumentsControllerTest)
    [./test/functional/documents_controller_test.rb:66:in
`test_user_should_not_show_documents'
     /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/
active_support/testing/setup_and_teardown.rb:67:in `__send__'
     /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/
active_support/testing/setup_and_teardown.rb:67:in `run']:
<Exceptions::SecurityTransgression> exception expected but was
Class: <SecurityTransgression>
Message: <"SecurityTransgression">
---Backtrace---
/Users/yves/Developpement/Projects/aelmat/intranet/app/controllers/
documents_controller.rb:19:in `show'
........

the exception is expected, but ...

what could be the problem ?

Note : I am using the same assert_raise
(Exceptions::SecurityTransgression) in testing another controller
without any problem ...

thanks for your suggestions

erwin

got it... I forgot to write an Include Exceptions in my
DocumentsController
where the SecurityTransgression is defined....