issue with rspec and url rewriting...

I tam trying to generate a RESTful route from inside a mailer testing
spec, but I get an undefined method ...

I wrote the following code

require File.dirname(__FILE__) + '/../spec_helper'

describe "Password Reset Instructions Email" do
  include EmailSpec::Helpers
  include EmailSpec::Matchers
  include ActionController::UrlWriter

  fixtures :users

  @user = User.find_by_email("")
  default_url_options[:host] = ''
  @password_reset_link = edit_password_reset_url
but when debugging : edit_password_reset_url(@user.perishable_token)
it raises :
NoMethodError Exception: undefined method `edit_password_reset_url'
for Spec::Rails::Example::ModelExampleGroup::Subclass_1:Class

which is strange ....
@user.perishable_token => "quQOoHuCpcueewwL1Ps6" is defined..

did I missed any additional include ?