public static function setUpBeforeClass()
{
@chmod(__DIR__, 0775);
@mkdir(__DIR__ . '/data', 0775, true);
// DON'T put this in create
// create db
self::$db = new Database(__DIR__ . '/data');
self::$db->guid = self::guid();
// create index
self::$guidIndex = new Index(self::$db, 'guid', 'guid');
// random delay for concurrent testing
usleep(rand(0, 100));
}