@Before
  public void before() {
    MockitoAnnotations.initMocks(this);
    conf = testUtil.getConfiguration();
    normalizer = new SimpleRegionNormalizer();
    worker = new RegionNormalizerWorker(conf, masterServices, normalizer, queue);
    final RegionNormalizerManager normalizerManager =
      new RegionNormalizerManager(stateStore, chore, queue, worker);
    configurationManager = new ConfigurationManager();
    configurationManager.registerObserver(normalizerManager);
  }
Test that configuration changes are propagated to all children.
hbase-server/src/test/java/org/apache/hadoop/hbase/master/normalizer/TestRegionNormalizerManagerConfigurationObserver.java