@GwtIncompatible // SerializableTester
  public void testKeySetIsSerializable_jdkBackedImmutableMap() {
    class NonSerializableClass {}

    Entry<String, NonSerializableClass>[] entries =
        arrayOf(ImmutableMap.entryOf("one", new NonSerializableClass()));

    ImmutableMap<String, NonSerializableClass> map =
        JdkBackedImmutableMap.create(1, entries, /* throwIfDuplicateKeys= */ true);
    Set<String> set = map.keySet();

  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testKeySetIsSerializable_regularImmutableMap() {
    class NonSerializableClass {}

    Map<String, NonSerializableClass> map =
        RegularImmutableMap.create(1, new Object[] {"one", new NonSerializableClass()});
    Set<String> set = map.keySet();

    LenientSerializableTester.reserializeAndAssertLenient(set);
  }

  @J2ktIncompatible