@BeforeClass
  public static void setUp() throws Exception {
    // use small page
    EnvFactory.getEnv()
        .getConfig()
        .getCommonConfig()
        .setMaxNumberOfPointsInPage(100)
        .setPageSizeInByte(1024 * 15)
        .setGroupSizeInByte(1024 * 100)
        .setMemtableSizeThreshold(1024 * 100)
        .setPartitionInterval(100)
        .setQueryThreadCount(2)
        .setCompressor("LZ4");

    EnvFactory.getEnv().initClusterEnvironment();

    insertData();
  }
Notice that, all test begins with "IoTDB" is integration test. All test which will start the
IoTDB server should be defined as integration test.
integration-test/src/test/java/org/apache/iotdb/relational/it/db/it/IoTDBMultiDeviceTableIT.java