// Set up mock behaviors
        when(mockContext.getConfig()).thenReturn(mockConfig);
        when(mockContext.getCredentials()).thenReturn(mockCredentials);
        when(mockContext.getTransportPool()).thenReturn(mockTransportPool);
        when(mockConfig.getDfsTtl()).thenReturn(300L);

        // Mock transport to throw IOException - simulating connection failure

     */
    BufferCache getBufferCache();

    /**
     * Get the transport pool for managing SMB connections
     *
     * @return the transport pool
     */
    SmbTransportPool getTransportPool();

    /**
     * Get the DFS resolver for handling distributed file system paths
     *
     * @return the DFS instance for this context
     */
    DfsResolver getDfs();

    /**

        }

        @Override
        public DfsResolver getDfs() {
            return null; // Not relevant for AbstractCIFSContext tests
        }

        @Override
        public SmbTransportPool getTransportPool() {
            return null; // Not relevant for AbstractCIFSContext tests
        }

        @Override
        public BufferCache getBufferCache() {

        return getChallenge(tf, dc, 0);
    }

    @Override
    public byte[] getChallenge(final CIFSContext tf, final Address dc, final int port) throws SmbException {
        try (SmbTransportInternal trans = tf.getTransportPool()
                .getSmbTransport(tf, dc, port, false, !tf.getCredentials().isAnonymous() && tf.getConfig().isIpcSigningEnforced())
                .unwrap(SmbTransportInternal.class)) {
            trans.ensureConnected();

                    if (log.isDebugEnabled()) {
                        log.debug("Using exclusive transport for " + this);
                    }
                    this.exclusiveTransport = this.ctx.getTransportPool()
                            .getSmbTransport(this.ctx, host, loc.getPort(), true, loc.shouldForceSigning())
                            .unwrap(SmbTransportInternal.class);

            transportContextField.set(ntlmServlet, cifsContext);
        } catch (Exception e) {
            throw new RuntimeException("Failed to inject mock CIFSContext", e);
        }

        when(cifsContext.getTransportPool()).thenReturn(transportPool);
        when(cifsContext.getNameServiceClient()).thenReturn(nameServiceClient);
        lenient().when(cifsContext.getConfig()).thenReturn(configuration);

                }

                req.getSession(); /* ensure session id is set for cluster env. */
                challenge = getTransportContext().getTransportPool().getChallenge(getTransportContext(), dc);
                if ((ntlm = NtlmSsp.authenticate(getTransportContext(), req, resp, challenge)) == null) {
                    return;
                }

            log.debug("Exception in disconnect", e);
        } finally {
            this.socket = null;
            this.digest = null;
            this.tconHostName = null;
            this.transportContext.getTransportPool().removeTransport(this);
        }
        return wasInUse;
    }

    @Override
    protected long makeKey(final Request request) throws IOException {
        long m = this.mid.incrementAndGet() - 1;