public MockHelixManager getHelixManager(InstanceType instanceType) {
    return instanceType == InstanceType.PARTICIPANT ? participantHelixManager : spectatorHelixManager;
  }
Return the {@link MockHelixManager}
@param clusterName unused.
@param instanceName unused.
@param instanceType unused.
@param zkAddr unused.
@return the {@link MockHelixManager}
ambry-clustermap/src/test/java/com/github/ambry/clustermap/MockHelixManagerFactory.java