protected function initSuite()
    {
        $suiteNodes = $this->xml->xpath('/testsuites/testsuite/testsuite');
        $this->isSingle = \count($suiteNodes) === 0;
        $node = current($this->xml->xpath('/testsuites/testsuite'));

        if ($node !== false) {
            $this->suites[] = TestSuite::suiteFromNode($node);
        } else {
            $this->suites[] = TestSuite::suiteFromArray(self::$defaultSuite);
        }
    }