@Test
  public void testOverFlowOnlySyncDestroyTx() {
    diskProps.setMaxOplogSize(20480);
    diskProps.setOverFlowCapacity(1);
    diskProps.setDiskDirs(dirs);
    region = DiskRegionHelperFactory.getSyncOverFlowOnlyRegion(cache, diskProps);
    assertNotNull(region);
    region.put("key", "createValue");
    region.put("key1", "createValue1");
    cache.getCacheTransactionManager().begin();
    region.destroy("key");
    cache.getCacheTransactionManager().commit();
    assertNull("The deleted entry should have been null",
        ((LocalRegion) region).entries.getEntry("key"));
  }
Tests if 'destroy' transaction is working correctly for sync-overflow-only disk region entry
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/OplogJUnitTest.java