@Test
public void testRpcClientId() {

  byte[] uuid = ClientId.getClientId();
  RpcRequestHeaderProto header = ProtoUtil.makeRpcRequestHeader(
      RpcKind.RPC_PROTOCOL_BUFFER, OperationProto.RPC_FINAL_PACKET, 0,
      RpcConstants.INVALID_RETRY_COUNT, uuid);
  assertTrue(Arrays.equals(uuid, header.getClientId().toByteArray()));
}