@Override
    public int getClassId() {
        return PredicateDataSerializerHook.NOTEQUAL_PREDICATE;
    }
@Test
    public void getId_isConstant() {
        NotEqualPredicate predicate = new NotEqualPredicate("bar", "foo");
        int id = predicate.getClassId();

        // make sure the ID has not been changed by accident
        assertEquals(9, id);
    }