assertEquals(Integer.valueOf(789), MapValueExtractor.getInteger(map, "string"));
        assertNull(MapValueExtractor.getInteger(map, "missing"));
    }

    @Test
    public void testGetDouble() {
        Map<String, Object> map = new HashMap<>();
        map.put("double", 1.5d);
        map.put("float", 2.5f);
        map.put("string", "3.5");