Codeception\TestCase\WPTestCase::setUpBeforeClass PHP Method

    public static function setUpBeforeClass()
    {
        parent::setUpBeforeClass();
        $c = self::get_called_class();
        if (!method_exists($c, 'wpSetUpBeforeClass')) {
            return;
        }
        call_user_func(array($c, 'wpSetUpBeforeClass'), self::factory());
        self::commit_transaction();
    }

 public static function setUpBeforeClass()
 {
     self::$tz_backup = date_default_timezone_get();
     return parent::setUpBeforeClass();
 }