private void createRegionWithEvictionCountOverflow() {
    RegionFactory regionFactory = cacheRule.getCache().createRegionFactory();

    regionFactory.setEvictionAttributes(createLRUEntryAttributes(100, OVERFLOW_TO_DISK));
    regionFactory.setScope(Scope.DISTRIBUTED_ACK);

    regionFactory.create(uniqueName);
  }
Tests that invalidates and updates received from different VMs are handled appropriately by
overflow regions.
geode-core/src/distributedTest/java/org/apache/geode/cache30/DiskRegionDistributedTest.java