@Override
    public void addListener(Object o, PropertyKey propertyKey, HelixConstants.ChangeType changeType,
        Watcher.Event.EventType[] eventTypes) {
      throw new IllegalStateException("Not implemented");
    }
A mock implementation of the {@link HelixManager} for exclusive use for testing the {@link HelixParticipant}
ambry-clustermap/src/test/java/com/github/ambry/clustermap/MockHelixManagerFactory.java