// Expected format: S-1-5-305419896
        String sidString = sid.toString();
        assertNotNull(sidString);
        assertEquals("S-1-5-305419896", sidString);
    }

    @Test
    public void testReadSid() throws IOException, PACDecodingException {
        // A simple SID: S-1-1-0
        byte[] data = new byte[] { 0x01, 0x00, 0x00, 0x00, // sidSize = 1
                0x01, // revision