Collection<String> c = ImmutableMultiset.of();
    assertSame(c, SerializableTester.reserialize(c));
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testSerialization_multiple() {
    Collection<String> c = ImmutableMultiset.of("a", "b", "a");
    Collection<String> copy = SerializableTester.reserializeAndAssert(c);
    assertThat(copy).containsExactly("a", "a", "b").inOrder();
  }

    Collection<String> c = ImmutableMultiset.of();
    assertSame(c, SerializableTester.reserialize(c));
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testSerialization_multiple() {
    Collection<String> c = ImmutableMultiset.of("a", "b", "a");
    Collection<String> copy = SerializableTester.reserializeAndAssert(c);
    assertThat(copy).containsExactly("a", "a", "b").inOrder();
  }