private void validatePartitionedSubregionDoesNotExist(final VM vm) {
    vm.invoke(() -> {
      Cache cache = getCache();

      Region<Integer, Integer> region = cache.getRegion(
          PARENT_REGION_NAME + SEPARATOR + CHILD_REGION_NAME + SEPARATOR + PARTITIONED_REGION_NAME);
      assertThat(region).isNull();
    });
  }
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