multiset = ConcurrentHashMultiset.create(map);
    multiset.addAll(ImmutableList.of("a", "a", "b", "c", "d", "b"));
    reserializeAndAssert(multiset);
  }

  public void testSerializationWithMapMaker3() {
    ConcurrentMap<String, AtomicInteger> map = new MapMaker().makeMap();
    multiset = ConcurrentHashMultiset.create(map);
    multiset.addAll(ImmutableList.of("a", "a", "b", "c", "d", "b"));