assertEquals(liveCount, countLiveEntries(map, 0));
      // expansion cleanup is sloppy, with a goal of avoiding unnecessary copies
      assertTrue(segment.count >= liveCount);
      assertTrue(segment.count <= originalCount);
      assertEquals(originalMap, ImmutableMap.copyOf(map));
    }
  }

  private static <K, V> int countLiveEntries(LocalCache<K, V> map, long now) {
    int result = 0;