assertEquals(Long.valueOf(456L), MapValueExtractor.getLong(map, "int"));
        assertEquals(Long.valueOf(789L), MapValueExtractor.getLong(map, "string"));
    }

    @Test
    public void testGetLong_withNullAndMissingKey() {
        Map<String, Object> map = new HashMap<>();
        map.put("null", null);

        assertNull(MapValueExtractor.getLong(map, "null"));
        assertNull(MapValueExtractor.getLong(map, "missing"));