SerializableTester.reserializeAndAssert(unmodifiable);
    assertSame(INT_COMPARATOR, multimap.valueComparator());
  }

  public void testUnmodifiableMultimapIsView() {
    Multimap<String, Integer> mod = HashMultimap.create();
    Multimap<String, Integer> unmod = Multimaps.unmodifiableMultimap(mod);
    assertEquals(mod, unmod);
    mod.put("foo", 1);