@After
  public void tearDown() {
    invokeInEveryVM(() -> {
      InternalResourceManager.setResourceObserver(null);
      DistributionMessageObserver.setInstance(null);
    });
  }
TODO test colocated regions where buckets aren't created for all subregions

<p>
TODO test colocated regions where members aren't consistent in which regions they have
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/control/RebalanceOperationDistributedTest.java