@Test
  public void testHelperAPIsForPersistenceRegion() {
    helperAPIsForPersistenceWithOrWithoutOverflowRegion(false /* should overflow */);
  }
Tests the various DiskEntry.Helper APIs for correctness as there is now delayed creation of
DiskId and accessing OplogkeyId will throw UnsupportedException
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/OplogJUnitTest.java