public function testSerializeWithScalarChildrenWithNullValueAndDefault()
 {
     $node = new ObjectNode();
     $node->add('key1', new ScalarNode(), true);
     $node->add('key2', new ScalarNode(), true);
     $serialzed = new \stdClass();
     $serialzed->key1 = null;
     $serialzed->key2 = null;
     self::assertEquals($serialzed, $node->serialize());
 }
 /**
  * @return \stdClass|null
  */
 public function serialize()
 {
     return $this->rootNode->serialize();
 }