assertEquals(3.5d, MapValueExtractor.getDouble(map, "string"), 0.001d);
        assertNull(MapValueExtractor.getDouble(map, "missing"));
    }

    @Test
    public void testGetBoolean() {
        Map<String, Object> map = new HashMap<>();
        map.put("true", true);
        map.put("false", false);
        map.put("stringTrue", "true");
        map.put("stringFalse", "false");