boolean expected8 = true;
        doc.put("key8", expected8);
        assertEquals(expected8, DocumentUtil.getValue(doc, "key8", Boolean.class).booleanValue());
    }

    public void test_getValue_with_null_map() {
        assertNull(DocumentUtil.getValue(null, "key", String.class));
        assertNull(DocumentUtil.getValue(null, "key", Integer.class));
    }

    public void test_getValue_with_null_key() {