public static String findBsn(List<Container> categorieList){
        return findValue(categorieList, CATEGORIE_IDENTIFICATIENUMMERS, ELEMENT_BURGERSERVICENUMMER);
    }
@Test
    public void testEmptyCategorie() {
        Container container = new Container();
        assertThat(CategorieUtil.findBsn(List.of(container)), nullValue());
    }