RC2: Functional tests fail when they generate a route before calling an action

Given a PiratesController and the route resources :pirates, the following functional test fails:

require 'test_helper'

class PiratesControllerTest < ActionController::TestCase
  setup do
    pirates_path
    delete :destroy, :id => 1
  end
  
  test "the truth" do
    assert true
  end
end

  1) Error:
test_the_truth(PiratesControllerTest):
ActionController::RoutingError: No route matches {:relative_url_root=>nil, :action=>"destroy", :id=>1}
method _callback_before_31 in pirates_controller_test.rb at line 6

The test passes if the pirates_path is commented out.