Configuration asciiCfg = new OffUnicodeConfig();
        assertFalse(asciiCfg.isUseUnicode(), "Unicode should be disabled in ASCII config");
    }

    @Test
    public void testUnicodeEncoding() {
        // Test Unicode string encoding
        String msg = "\u00A1\u00A2"; // two Unicode characters
        byte[] encoded = encodeUnicode(msg);