private void createParentRegion(final VM vm) {
    vm.invoke(() -> {
      Cache cache = getCache();
      RegionFactory<Object, Object> regionFactory =
          cache.createRegionFactory(RegionShortcut.REPLICATE);
      regionFactory.create(PARENT_REGION_NAME);
    });
  }
Verifies that destroyRegion, localDestroyRegion and close work properly when PartitionedRegion is
a subregion.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/PartitionedRegionAsSubregionDUnitTest.java