# File lib/action_controller/test_process.rb, line 445
    def build_request_uri(action, parameters)
      unless @request.env['REQUEST_URI']
        options = @controller.__send__(:rewrite_options, parameters)
        options.update(:only_path => true, :action => action)

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