method_missing

# File actionview/lib/action_view/test_case.rb, line 418
      def method_missing(selector, ...)
        begin
          routes = @controller.respond_to?(:_routes) && @controller._routes
        rescue
          # Don't call routes, if there is an error on _routes call
        end

        if routes &&
           (routes.named_routes.route_defined?(selector) ||
             routes.mounted_helpers.method_defined?(selector))
          @controller.__send__(selector, ...)
        else
          super
        end
      end