monitorTarget.append(buf, "longKey", supplier);
        assertEquals("\"longKey\":9876543210", buf.toString());
    }

    // Test append method with Short value
    public void test_append_shortValue() {
        StringBuilder buf = new StringBuilder();
        Supplier<Object> supplier = () -> Short.valueOf((short) 42);

        monitorTarget.append(buf, "shortKey", supplier);