public function testGetFirstChildElementNotFound()
 {
     $dom = new DOMDocument('1.0', 'UTF-8');
     $dom->loadXML('<parent>some text <![CDATA[function() { alert("stop!"); }]]></parent>');
     $element = $dom->documentElement;
     $this->assertFalse(Marshaller::getFirstChildElement($element));
 }