module ActionView::Rendering::ClassMethods

def view_context_class
  @view_context_class ||= begin
    routes = respond_to?(:_routes) && _routes
    helpers = respond_to?(:_helpers) && _helpers
    Class.new(ActionView::Base) do
      if routes
        include routes.url_helpers
        include routes.mounted_helpers
      end
      if helpers
        include helpers
      end
    end
  end
end