@Override
      public void run() {
        Cache cache = getCache();
        Region region = cache.getRegion("region");
        try {
          region.getAttributesMutator().addCacheListener(new TestCacheListener());
        } catch (Exception e) {
          Assert.fail("couldn't create index", e);
        }
      }
A test of the when we will use the object sizer to determine the actual size of objects wrapped
in CacheDeserializables.



TODO - I was intending to add tests that have an index and object sizer, but it appears we don't
support indexes on regions with overflow to disk.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/SizingFlagDUnitTest.java