public function testReplace()
 {
     $xml = '
       <ns1:NCIPMessage xmlns:ns1="http://www.niso.org/2008/ncip">
          <ns1:Test>
             Hello
          </ns1:Test>
          <ns1:Test>
             Hi
          </ns1:Test>
       </ns1:NCIPMessage>';
     $expectedResult = '
       <ns1:NCIPMessage xmlns:ns1="http://www.niso.org/2008/ncip">
          <ns1:Test2>Replaced</ns1:Test2>
          <ns1:Test>
             Hi
          </ns1:Test>
       </ns1:NCIPMessage>';
     $el = new QuiteSimpleXMLElement($xml);
     $node = $el->first('ns1:Test');
     $new = new QuiteSimpleXMLElement('<ns1:Test2 xmlns:ns1="http://www.niso.org/2008/ncip">Replaced</ns1:Test2>');
     $node->replace($new);
     $this->assertXmlStringEqualsXmlString($expectedResult, $el->asXML());
 }