doc.put("numKey", numList);
        assertEquals(Integer.valueOf(123), DocumentUtil.getValue(doc, "numKey", Integer.class));
    }

    @Test
    public void test_first_element_from_string_array() {
        Map<String, Object> doc = new HashMap<>();
        String[] array = { "first", "second", "third" };
        doc.put("key", array);