System.arraycopy(buffer, 4, extractedGuid, 0, 16);
        assertArrayEquals(zeroGuid, extractedGuid);
    }

    @Test
    @DisplayName("Test encode with all 0xFF GUID")
    void testEncodeWithMaxGuid() {
        byte[] maxGuid = new byte[16];
        Arrays.fill(maxGuid, (byte) 0xFF);

        ValidateNegotiateInfoRequest request =