assertThat(SerializableTester.reserialize(multimap)).isSameInstanceAs(multimap);
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testSortedSerialization() {
    Multimap<String, Integer> multimap =
        new ImmutableSetMultimap.Builder<String, Integer>()
            .orderKeysBy(Ordering.natural().reverse())
            .orderValuesBy(Ordering.usingToString())