Predis\Response\Status::get PHP 메소드

    public static function get($payload)
    {
        switch ($payload) {
            case 'OK':
            case 'QUEUED':
                if (isset(self::${$payload})) {
                    return self::${$payload};
                }
                return self::${$payload} = new self($payload);
            default:
                return new self($payload);
        }
    }

 /**
  * @group disconnected
  */
 public function testStaticGetMethodCachesOnlyCommonStatuses()
 {
     $response = Status::get('OK');
     $this->assertSame($response, Status::get('OK'));
     $response = Status::get('QUEUED');
     $this->assertSame($response, Status::get('QUEUED'));
     $response = Status::get('PONG');
     $this->assertNotSame($response, Status::get('PONG'));
 }