map.put("null", null);

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

    @Test
    public void testGetFloat_withFloatValue() {
        Map<String, Object> map = new HashMap<>();
        map.put("float", 1.5f);
        map.put("double", 2.5d);
        map.put("int", 3);
        map.put("string", "4.5");