@Override
        public void beforeRegionDestroy2(RegionEvent event) throws CacheWriterException {
          assertThat(callbackArg).isEqualTo(event.getCallbackArgument());
        }
Tests that a {@link Region#localDestroyRegion} is not propagated to the server and that a
{@link Region#destroyRegion} is. Also makes sure that callback arguments are passed correctly.
geode-core/src/distributedTest/java/org/apache/geode/cache/ConnectionPoolDUnitTest.java