public static String findBsn(List<Container> categorieList){
        return findValue(categorieList, CATEGORIE_IDENTIFICATIENUMMERS, ELEMENT_BURGERSERVICENUMMER);
    }
@Test
    public void testFindBsn() {
        assertThat(CategorieUtil.findBsn(createFullCategories()), is("burgerservicenummer"));
    }