class MockApplication
  def self.env_config
    {}
  end

  def self.routes
    @routes ||= ActionDispatch::Routing::RouteSet.new
  end
end

MockApplication.routes.draw do
  resource :callback_tests
end

::Rails.application = MockApplication

ActionController::Base.send :include, RailsLocaleDetection::ControllerMethods
ActionController::Base.send :include, Rails.application.routes.url_helpers

class CallbackTestsController < ActionController::Base

  def user_locale
    :fr
  end

  def show
    if ::Rails.version.to_s < "4.1"
      render text: current_locale
    else
      render plain: current_locale
    end

  end

end