/**
* @param string $css CSS selector to convert to XML and test
* @param string $test_sxml A test XML document, in serialized form
* @param string $expected_sxml Serialized representation of the [expected] result of the XPath query
*/
public static function assertCSS2XPathSerializedXMLEquals($css, $test_sxml, $expected_sxml)
{
//convert the serialised XML into a proper XML document tree
$document = DOMDocumentSerialize::deserialize($test_sxml);
//do the CSS to XPath translation
$xpath = static::$Translator->translateQuery($css);
//apply the XPath; this will give us a list of nodes it selected
$xquery = new DOMXPath($document);
$nodes = $xquery->query('//DOMDocumentSerialize' . $xpath, $document->documentElement);
//re-serialize the XPath result
$result_sxml = DOMDocumentSerialize::serializeDOMNodeList($nodes);
//clean-up
unset($nodes, $xquery, $document);
self::assertEquals($expected_sxml, $result_sxml, "Failed to assert that the CSS to XPath translation produced the expected behaviour\n" . "xpath : {$xpath}");
}
