@Override
    public void addConfigChangeListener(ScopedConfigChangeListener listener, HelixConfigScope.ConfigScopeProperty scope)
        throws Exception {
      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