Predicates.in(differentOrder))
        .addEqualityGroup(Predicates.in(differentNums))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testIn_serialization() {
    checkSerialization(Predicates.in(Arrays.asList(1, 2, 3, null)));
  }

  public void testIn_handlesNullPointerException() {
    class CollectionThatThrowsNullPointerException<T> extends ArrayList<T> {

            Predicates.in(differentOrder))
        .addEqualityGroup(Predicates.in(differentNums))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testIn_serialization() {
    checkSerialization(Predicates.in(Arrays.asList(1, 2, 3, null)));
  }

  public void testIn_handlesNullPointerException() {
    class CollectionThatThrowsNullPointerException<T> extends ArrayList<T> {