when(mockSmbPipeHandleInternal.isStale()).thenReturn(false);
            when(mockSmbPipeHandleInternal.sendrecv(buf, 0, 50, inB, 4280)).thenReturn(40);

            int result = handle.doSendReceiveFragment(buf, 0, 50, inB);
            assertEquals(40, result);
            verify(mockSmbPipeHandleInternal).sendrecv(buf, 0, 50, inB, 4280);
        }

        @Test

        assertEquals("TESTDOM", s2.getDomainName());
        assertEquals(jcifs.SID.SID_TYPE_DOM_GRP, s2.getType());

        // Interaction: sendrecv invoked exactly once
        verify(handle, times(1)).sendrecv(any(jcifs.dcerpc.msrpc.MsrpcLookupSids.class));
    }

    @ParameterizedTest
    @ValueSource(ints = { NtStatus.NT_STATUS_SUCCESS, NtStatus.NT_STATUS_NONE_MAPPED, 0x00000107 })

                .thenAnswer(inv -> inv.getArgument(1));

        int n = handle.sendrecv(new byte[10], 0, 0, new byte[20], 100);
        assertEquals(0, n, "Default response length is 0 unless protocol fills it");
    }

    @Test
    @DisplayName("sendrecv uses CallNamedPipe when PIPE_TYPE_CALL is set")
    void sendrecv_call_branch() throws Exception {

            // Given: Spy to intercept sendrecv calls
            TestDcerpcHandle spyHandle = spy(new TestDcerpcHandle(mockContext, mockBinding));
            doNothing().when(spyHandle).sendrecv(any(DcerpcMessage.class));

            // When: Binding the handle
            spyHandle.bind();

            // Then: Should call sendrecv with bind message
            verify(spyHandle).sendrecv(any(DcerpcMessage.class));
        }

            message.setFlags(request.getFlags());
            message.setTimeout((int) (context.getConfig().getWitnessRegistrationTimeout() / 1000));

            // Send the RPC request
            rpcHandle.sendrecv(message);

            // Create response from RPC message results
            WitnessRegisterResponse response = new WitnessRegisterResponse();
            response.setReturnCode(message.getReturnCode());

        assertArrayEquals(new byte[] { 1, 2, 3 }, key);
        verify(tree, times(1)).getSession();
        verify(session, times(1)).getSessionKey();
    }

    @Test
    @DisplayName("sendrecv SMB2 path issues IOCTL and returns response length")
    void testSendRecvSmb2() throws IOException, CIFSException {
        when(pipe.ensureTreeConnected()).thenReturn(tree);
        when(tree.acquire()).thenReturn(tree);

    }

    void resolveSids(final DcerpcHandle handle, final LsaPolicyHandle policyHandle, final jcifs.SID[] sids) throws IOException {
        final MsrpcLookupSids rpc = new MsrpcLookupSids(policyHandle, sids);
        handle.sendrecv(rpc);
        switch (rpc.retval) {
        case 0:
        case NtStatus.NT_STATUS_NONE_MAPPED:
        case 0x00000107: // NT_STATUS_SOME_NOT_MAPPED
            break;
        default:

        }
        return this.output;
    }

    /**
     *
     * {@inheritDoc}
     *
     * @see jcifs.smb.SmbPipeHandleInternal#sendrecv(byte[], int, int, byte[], int)
     */
    @SuppressWarnings("resource")
    @Override
    public int sendrecv(final byte[] buf, final int off, final int length, final byte[] inB, final int maxRecvSize) throws IOException {

        synchronized (this) {
            try {
                state = 1;
                final DcerpcMessage bind = new DcerpcBind(binding, this);
                sendrecv(bind);
            } catch (final IOException ioe) {
                state = 0;
                throw ioe;
            }
        }
    }

    /**

        throw new IOException("Failed to establish session with " + address);
    }

    private void negotiate(int port, final ServerMessageBlock resp) throws IOException {
        /* We cannot use Transport.sendrecv() yet because
         * the Transport thread is not setup until doConnect()
         * returns and we want to supress all communication
         * until we have properly negotiated.
         */