@Override
      public void goingToFlush() { // Delay flushing

        assertEquals(10, region.size());
        for (int i = 10; i < 20; ++i) {
          region.put("" + i, val);
        }
        synchronized (OplogJUnitTest.this) {
          OplogJUnitTest.this.notify();
          LocalRegion.ISSUE_CALLBACKS_TO_CACHE_OBSERVER = false;
        }

      }
Tests if the byte buffer pool in asynch mode tries to contain the pool size
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/OplogJUnitTest.java