* Verifies that unwrap can throw exceptions when appropriate.
     */
    @Test
    void testUnwrap_throwsException() {
        when(smbTree.unwrap(any())).thenThrow(new ClassCastException("Cannot unwrap to specified type"));

        assertThrows(ClassCastException.class, () -> smbTree.unwrap(CustomSmbTree.class),
                "Should throw ClassCastException when type is incompatible");
    }

        LsaPolicyHandle handle = new LsaPolicyHandle(mockDcerpcHandle, "server", 123);

        // Now, mock the behavior for MsrpcLsarClose to throw IOException
        doThrow(new IOException("Close network error")).when(mockDcerpcHandle).sendrecv(any(MsrpcLsarClose.class));

        // Act & Assert
        IOException thrown = assertThrows(IOException.class, () -> {

import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.doNothing;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.lenient;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

            // Make TYPE_FILESYSTEM path, not named pipe
            when(mockFile.getType()).thenReturn(SmbConstants.TYPE_FILESYSTEM);

            // Capture the ReadAndX request; throw to short-circuit network
            doAnswer(inv -> {
                throw new SmbException("short-circuit");
            }).when(mockTree)
                    .send(any(jcifs.internal.CommonServerMessageBlockRequest.class),

            // Assert - should not throw exception when file exists
        }
    }

    @Nested
    class WhenHandlingConnections {

        @Test
        void testConnect() throws IOException {
            // Arrange
            doNothing().when(smbFile).connect();

            // Act
            smbFile.connect();

            // Assert - should not throw exception
        }

    @ParameterizedTest
    @DisplayName("getSmbTree invalid inputs (null/empty) throw IllegalArgumentException")
    @CsvSource({ ",service", // null share
            " ,service", // empty share
            "share,", // null service
            "share, " // empty service
    })
    void getSmbTree_invalid(String share, String service) {

        // Close and verify subsequent calls throw
        handle.close();
        CIFSException ex1 = assertThrows(CIFSException.class, handle::getInput, "getInput after close must throw");
        assertTrue(ex1.getMessage().contains("Already closed"));
        CIFSException ex2 = assertThrows(CIFSException.class, handle::getOutput, "getOutput after close must throw");
        assertTrue(ex2.getMessage().contains("Already closed"));

            doThrow(new NullPointerException("dest argument is null")).when(mockResource).renameTo(null);

            // When/Then
            assertThrows(NullPointerException.class, () -> mockResource.renameTo(null),
                    "Should throw NullPointerException for null destination");
        }
    }

    @Nested
    @DisplayName("Stream Operations Tests")
    class StreamOperationsTests {

        @Test

        // Assert: interaction happened and did not throw
        verify(handle, times(1)).ensureDFSResolved();
        verifyNoMoreInteractions(handle);
    }

    @Test
    @DisplayName("ensureDFSResolved(): throws CIFSException when underlying call fails")
    void ensureDFSResolved_throws() throws Exception {
        // Arrange: configure the mock to throw

    public void testExceptionHandling() throws Exception {
        SmbSessionImpl session = new SmbSessionImpl(mockContext, "testhost", "testdomain", mockTransport);

        // Configure transport to throw exception on release
        Mockito.doThrow(new RuntimeException("Test exception")).when(mockTransport).release();

        session.acquire();

        // Should handle exceptions gracefully