@AfterClass
  public static void shutdownZookeeperServers() {
    for (com.github.ambry.utils.TestUtils.ZkInfo zkInfo : dcsToZkInfo.values()) {
      zkInfo.shutdown();
    }
  }
Test {@link HelixClusterChangeHandler} to verify its behavior is expected when handling cluster changes.
ambry-clustermap/src/test/java/com/github/ambry/clustermap/ClusterChangeHandlerTest.java