method_missing

# File actionpack/lib/action_view/test_case.rb, line 230
      def method_missing(selector, *args)
        if @controller.respond_to?(:_routes) &&
          ( @controller._routes.named_routes.helpers.include?(selector) ||
            @controller._routes.mounted_helpers.method_defined?(selector) )
          @controller.__send__(selector, *args)
        else
          super
        end
      end