assertNull(session.getSessionKey());
        verify(session, times(3)).getSessionKey();
    }

    // Error propagation: getSessionKey throws CIFSException
    @Test
    @DisplayName("getSessionKey throws CIFSException on failure")
    void getSessionKey_throws() throws CIFSException {
        doThrow(new CIFSException("session key failure")).when(session).getSessionKey();

    }

    @Override
    public String getServerWithDfs() {
        return this.pipe.getLocator().getServerWithDfs();
    }

    @Override
    public byte[] getSessionKey() throws CIFSException {
        return this.handle.getSessionKey();
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.dcerpc.DcerpcHandle#doSendReceiveFragment(byte[], int, int, byte[])
     */
    @Override

    /**
     * Gets the session key after successful authentication
     *
     * @return the session key or null if not available
     */
    byte[] getSessionKey();

    /**
     * Gets the signing key for SMB2/3
     *
     * @return the signing key or null if not available
     */
    byte[] getSigningKey();

    /**
     * Validates authentication credentials

    /**
     * Returns the current session key used for signing and encryption.
     *
     * @return the current session key
     * @throws CIFSException if the session key cannot be retrieved
     */
    byte[] getSessionKey() throws CIFSException;

    /**
     * Returns the SMB transport associated with this session.
     *
     * @return the transport for this session
     */
    SmbTransport getTransport();

    /**

     * Gets the session key from the underlying SMB session.
     *
     * @return session key of the underlying smb session
     * @throws CIFSException if an error occurs retrieving the session key
     */
    byte[] getSessionKey() throws CIFSException;

    /**
     * Gets the input stream for reading from this pipe.
     *
     * @return this pipe's input stream
     * @throws CIFSException if an error occurs getting the input stream

        multiConfig = new PropertyConfiguration(props);

        // Mock context and session for ChannelManager
        when(mockContext.getConfig()).thenReturn(multiConfig);
        when(mockSession.getSessionKey()).thenReturn(new byte[16]);

        channelManager = new ChannelManager(mockContext, mockSession);
    }

    @Test
    void testMultiChannelInitialization() throws Exception {