    # File lib/action_controller/test_process.rb, line 432
        def build_request_uri(action, parameters)
          unless @request.request_uri_overridden
            options = @controller.send(:rewrite_options, parameters)
            options.update(:only_path => true, :action => action)

            url = ActionController::UrlRewriter.new(@request, parameters)
            @request.request_uri = url.rewrite(options)
          end
        end