Rails - Nov 2012 - Rails 3.2 - test for application_helper.rb fails when trying to access application_controller method

I am trying to test my  application_helper methods, and some of them are 
calling ApplicationController methods

class ApplicationHelperTest < Test::Unit::TestCase
...
  test ''test_copyrights'' do
    assert_equal @subdomain[:name], copyright
  end

class ApplicationController < ActionController::Base
helper_method :current_subdomain
  def current_subdomain
      ...
  end
...
end

but the test is failing :
NameError: undefined local variable or method `current_subdomain''

how can I test it ?  ( where... in unit/functional/integration test ? and 
how to access the ApplicationController methods ?)

thanks for feedback

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