@After
  public void tearDown() throws Exception {
    try {
      if (cache != null) {
        cache.close();
      }
    } finally {
      CacheObserverHolder.setInstance(null);
      DiskStoreImpl.SET_IGNORE_PREALLOCATE = false;
      LocalRegion.ISSUE_CALLBACKS_TO_CACHE_OBSERVER = false;
    }
  }
Integration tests covering some miscellaneous functionality of Disk Region.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskRegionJUnitTest.java