@Test
void testRequireKeys_2args_2_3_err() {

    assertThrows(NoSuchElementException.class, () -> {
        final Map<String, String> map = new HashMap<>();
        map.put("A", "Tryggve");
        map.put("B", "Sven");
        final String[] arr = {"A", "B", "StangeKey"};
        final Map<String, String> result = NullUtil.requireKeys(map, arr);
    });
}