public function testMethod()
{
$extension = new MyExtension();
$config = new Config();
$config->addExtension($extension);
$xslDoc = new DOMDocument();
$xslDoc->load('Stubs/method.xsl');
$xslDoc->documentElement->setAttribute('version', '1.0');
$xmlDoc = new DOMDocument();
$xmlDoc->load('Stubs/collection.xml');
$processor = new XsltProcessor($config);
$processor->importStylesheet($xslDoc);
$processorResult = $processor->transformToXML($xmlDoc);
$this->assertEquals('24', trim($processorResult));
}
