rpc.retval = 0;
            return null;
        }).when(mockDcerpcHandle).sendrecv(any(MsrpcSamrCloseHandle.class));

        // Act
        aliasHandle.close();

        // Assert
        // Verify that sendrecv was called with MsrpcSamrCloseHandle
        verify(mockDcerpcHandle).sendrecv(any(MsrpcSamrCloseHandle.class));

            return null;
        }).when(mockDcerpcHandle).sendrecv(any(MsrpcLsarClose.class));

        // Act
        handle.close();

        // Assert
        // Verify sendrecv was called once for open and once for close
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarOpenPolicy2.class));
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarClose.class));
    }

    @Test

        // No exception thrown by sendrecv for MsrpcSamrConnect4
        doNothing().when(mockHandle).sendrecv(any(MsrpcSamrConnect4.class));

        try (SamrPolicyHandle handle = new SamrPolicyHandle(mockHandle, server, access)) {
            assertNotNull(handle);
            // Verify that sendrecv was called with MsrpcSamrConnect4
            verify(mockHandle, times(1)).sendrecv(any(MsrpcSamrConnect4.class));

            return null;
        }).when(mockDcerpcHandle).sendrecv(any(MsrpcSamrCloseHandle.class));

        // Act
        handle.close();

        // Assert
        // Verify sendrecv was called for open and then for close
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcSamrOpenDomain.class));
        verify(mockDcerpcHandle, times(1)).sendrecv(closeHandleCaptor.capture());

            return null;
        }).when(mockDcerpcHandle).sendrecv(any(MsrpcLsarClose.class));

        // Act
        handle.close();

        // Assert
        // Verify sendrecv was called once for open and once for close
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarOpenPolicy2.class));
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarClose.class));
    }

    @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 })

            // 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));
        }

                .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 {

            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

        }
        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 {