Iterator<Object> it = originalMap.keySet().iterator();
    for (int i = 0; i < originalCount - maxSize; i++) {
      it.next();
      it.remove();
    }
    segment.evictEntries(entry);
    assertEquals(maxSize, map.size());
    assertEquals(originalMap, map);
  }

  // reference queues

  public void testDrainKeyReferenceQueueOnWrite() {