Broken testable application controller in Rails 4.0.1

gistfile1.rb

require 'test_helper'

class TestableApplicationController < ApplicationController
  def test
    render nothing: true
  end
end

class TestableApplicationControllerTest < ActionController::TestCase
  Santa::Application.routes.append do
    get 'test' => 'testable_application#test'
  end

  test "test is cool" do
    get :test
    assert_response :success
  end
end