protected function getSuiteRootAttributes($suites)
{
return array_reduce($suites, function ($result, $suite) {
$result['tests'] += $suite->tests;
$result['assertions'] += $suite->assertions;
$result['failures'] += $suite->failures;
$result['errors'] += $suite->errors;
$result['time'] += $suite->time;
return $result;
}, array_merge(array('name' => $this->name), self::$defaultSuite));
}