@Override
      public Object call() {
        for (int i = 0; i < 10; i++) {
          TestRegion.destroy("Object" + i, i);
        }
        assertEquals(0, TestRegion.size());
        if (TestRegion.getDataPolicy().isReplicate()) {
          assertEquals(10, TestRegion.getTombstoneCount());
        }
        return null;
      }
test that distributed GC messages are properly cleaned out of durable client HA queues
geode-core/src/distributedTest/java/org/apache/geode/cache30/ClientServerCCEDUnitTest.java