public function testRender()
 {
     $domDocument = new \DOMDocument();
     $frameModel = new FrameModel();
     $frameModel->setId("model-id")->addChild(new Including())->setFormat(new Format());
     $domElement = $frameModel->render($domDocument);
     $domDocument->appendChild($domElement);
     $this->assertEquals($domDocument->saveXML(), "<?xml version=\"1.0\"?>\n<framemodel id=\"model-id\"><format/><include/></framemodel>\n");
 }
 /**
  * @see Renderable::render()
  */
 public function render(\DOMDocument $domDocument)
 {
     $domElement = parent::render($domDocument);
     if ($this->model) {
         $this->model->checkId();
         $domElement->setAttribute("modelid", $this->model->getId());
     } else {
         if ($this->modelId) {
             $domElement->setAttribute("modelid", $this->modelId);
         }
     }
     return $domElement;
 }