$this->assertEquals(
            'SELECT * FROM `' . DB_PREFIX . 'user` WHERE `id` = \'2\' OR `gid` = \'1\' OR `sid` = \'3\' OR `pid` = \'4\' OR `hid` = \'5\' OR `mid` = \'6\' OR `rank` IS NULL',
            self::qb()->from('user')->where_or('id = 2', ['gid', 1], ['sid', '=', '3'], ['pid' => 4, 'hid' => 5, 'mid' => 6], ['rank', 'IS NULL'])->sql()
        );