@Override
  protected final void postSetUp() throws Exception {
    deleteFiles();
    diskProps.setDiskDirs(dirs);
    diskProps.setCompactionThreshold(100);
    hasBeenNotified = false;
    LocalRegion.ISSUE_CALLBACKS_TO_CACHE_OBSERVER = true;
  }
Tests faulting in from current oplog, old oplog and htree for different modes (overflow only,
persist+overflow : Sync/Async)
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/FaultingInJUnitTest.java