ConcurrentHashMultiset<Integer> multiset = ConcurrentHashMultiset.create(iterable);
    assertEquals(2, multiset.count(2));
    reserializeAndAssert(multiset);
  }

  public void testIdentityKeyEquality_strongKeys() {
    testIdentityKeyEquality(STRONG);
  }

  public void testIdentityKeyEquality_weakKeys() {
    testIdentityKeyEquality(WEAK);
  }