@Override
          public void goingToFlush() {
            LocalRegion.ISSUE_CALLBACKS_TO_CACHE_OBSERVER = false;
            synchronized (OplogJUnitTest.this) {
              OplogJUnitTest.this.notify();
            }
          }
Tests if buffer size & time interval are explicitly set to zero then the flush will occur due
to asynchForceFlush or due to switching of Oplog
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/OplogJUnitTest.java