@Override
  public void testInsertTablets(Map<String, Tablet> tablets, boolean sorted)
      throws IoTDBConnectionException, StatementExecutionException {
    TSInsertTabletsReq request =
        genTSInsertTabletsReq(new ArrayList<>(tablets.values()), sorted, false);
    defaultSessionConnection.testInsertTablets(request);
  }
This method NOT insert data into database and the server just return after accept the request,
this method should be used to test other time cost in client
iotdb-client/session/src/main/java/org/apache/iotdb/session/Session.java