resp.received = true;

        session.transport(); // initialise transport

        // Mock the sessionSetup behavior to avoid actual network calls
        // The sessionSetup method would normally send authentication messages
        // Only mark the sessionSetup response as received, not the actual request/response
        doAnswer(invocation -> {

            if (response != null) {
                response.received = false;
            }

            expiration = System.currentTimeMillis() + SmbConstants.SO_TIMEOUT;
            sessionSetup(request, response);
            if (response != null && response.received) {
                return;
            }

            if (request instanceof final SmbComTreeConnectAndX tcax) {

                }

                T chainedResponse;
                try {
                    chainedResponse = sessionSetup(request, response);
                } catch (GeneralSecurityException e) {
                    throw new SmbException("Session setup failed", e);
                }

        SMBUtil.writeInt4(0x00000001, buf, start + 16);
        // SessionId at +40 (sync header)
        SMBUtil.writeInt8(sessionId, buf, start + 40);
    }

    /**
     * Build a SESSION_SETUP response body with specified flags and security blob.
     * securityBufferOffset is set relative to header start.
     */