final Map<String, Object> map = Map.of("key", "string_value");
        assertNull(coordinatorHelper.getMapValue(map, "key"));
    }

    @Test
    public void test_getMapValue_missing() {
        final Map<String, Object> map = Map.of("key", "value");
        assertNull(coordinatorHelper.getMapValue(map, "nonexistent"));
    }

    @Test
    public void test_getListValue_exists() {