assertEquals(4, multiset.count(s2));

    multiset.remove(s1);
    assertEquals(3, multiset.count(s1));
    assertEquals(3, multiset.count(s2));
  }

  public void testSerializationWithMapMaker1() {
    ConcurrentMap<String, AtomicInteger> map = new MapMaker().makeMap();
    multiset = ConcurrentHashMultiset.create(map);
    reserializeAndAssert(multiset);
  }