private void verifyRegionMXBeanIsNull(final String regionName, final String subregionName) {
    RegionMXBean regionMXBean =
        getManagementService().getLocalRegionMBean(toPath(regionName, subregionName));
    assertThat(regionMXBean).isNull();
  }
Add a Notification listener to DistributedSystemMBean which should gather all the notifications
which are propagated through all individual MemberMBeans Hence Region created/destroyed should
be visible to this listener
geode-core/src/distributedTest/java/org/apache/geode/management/RegionManagementDUnitTest.java