/**
  * @return RpcResponsePayload
  */
 public function getPayload()
 {
     $data = parent::getPayload()->getData();
     return new RpcResponsePayload($data);
 }
 public function test_getPayload_returnsPayloadInterface()
 {
     $message = new BasicMessage();
     $payload = $message->getPayload();
     $this->assertTrue($payload instanceof PayloadInterface);
 }