// Verify max security mode value (2 bytes)
        assertEquals(0xFFFF, SMBUtil.readInt2(buffer, 20) & 0xFFFF);
    }

    @Test
    @DisplayName("Test encode with all zero GUID")
    void testEncodeWithZeroGuid() {
        byte[] zeroGuid = new byte[16];
        ValidateNegotiateInfoRequest request =
                new ValidateNegotiateInfoRequest(DEFAULT_CAPABILITIES, zeroGuid, DEFAULT_SECURITY_MODE, defaultDialects);