How can I authenticate a user for my controller tests with Devise and devise_ldap_authenticatable?

I'm attempting to run tests on my controllers in my Rails application; however, I am unable to get a user authenticated prior to testing. I am able to authenticate against Active Directory when accessing the site though. I have the following setup...

test_helper.rb

...
class ACtionController::TestCase
   include Devise::TestHelpers
end
...

clubs_controller_test.rb

require 'test_helper'

class ClubsControllerTest < ActionController::TestCase

  setup :initialize_club_base

  test "should create club" do
    assert_difference('Club.count') do
      post :create, club: { ... }
    end
    assert_redirected_to club_path(assigns(:club))
  end  

  private

  def initialize_club_base
    @club = clubs(:base)
  end
end

Error

1) Failure: 
   ClubsControllerTest#test_should_create_club [/path/to/file...:20]:
   "Club.count" didn't change by 1.
   Expected: 2
   Actual: 1

Now I believe I need to sign in a user in the "setup" section of the controller test... but since I'm relying on authentication through Active Directory can I do this? If so do I have to create a test user in Active Directory or is there a way around having to do that as it seems to not be an optimal solution having a fake user in the Active Directory.