void ensureTreeConnected_propagatesException() throws Exception {
        // Arrange
        SmbPipeOutputStream out = newStream();
        CIFSException boom = new CIFSException("tree-fail");
        when(handle.ensureTreeConnected()).thenThrow(boom);

        // Act + Assert
        CIFSException ex = assertThrows(CIFSException.class, out::ensureTreeConnected);
        assertEquals("tree-fail", ex.getMessage());

        // Act & Assert: the exception is propagated and interaction recorded once
        RuntimeException thrown = assertThrows(RuntimeException.class, supplier::get);
        assertInstanceOf(SmbUnsupportedOperationException.class, thrown.getCause());
        assertEquals("boom", thrown.getCause().getMessage());
        verify(supplier, times(1)).get();

    void throwsSmbExceptionFromFilter() {
        SmbFilenameFilter filter = (dir, name) -> {
            throw new SmbException("boom");
        };

        SmbException ex = assertThrows(SmbException.class, () -> filter.accept(mockDir, "x"));
        assertEquals("boom", ex.getMessage(), "Exception message should be preserved");
        verifyNoInteractions(mockDir);
    }

    /**

        // Arrange: filter delegates to isDirectory which may throw SmbException
        SmbFileFilter filter = f -> f.isDirectory();
        SmbException boom = new SmbException("io error");
        when(smbFile.isDirectory()).thenThrow(boom);

        // Act + Assert
        SmbException thrown = assertThrows(SmbException.class, () -> filter.accept(smbFile));
        assertEquals("io error", thrown.getMessage());

            when(src.getContext()).thenReturn(ctx);

            // Force failure before any stream construction
            when(src.openUnshared(anyInt(), anyInt(), anyInt(), anyInt(), anyInt())).thenThrow(new SmbException("boom"));

            SmbTreeHandleImpl sh = newTreeHandle(false); // force non-SMB2 path to avoid server-side branch
            SmbTreeHandleImpl dh = newTreeHandle(false);

            public SmbTreeHandleImpl connect(SmbResourceLocatorImpl loc) throws SmbException {
                throw new SmbException("boom");
            }
        };
        SmbException ex3 = assertThrows(SmbException.class, () -> c3.connectWrapException(loc));
        assertEquals("boom", ex3.getMessage());
    }

    @Test
    @DisplayName("ensureDFSResolved returns early for SmbComClose requests")

        when(tree.send(any(Smb2IoctlRequest.class), eq(RequestParam.NO_RETRY))).thenThrow(new SmbException("boom"));

        IOException ex = assertThrows(IOException.class, stream::available, "Should convert SmbException to IOException");
        assertTrue(ex.getMessage().contains("boom"));
    }

    @Test
    @DisplayName("ensureTreeConnected delegates to handle")

            SmbException se = new SmbException("x", new jcifs.util.transport.TransportException(new InterruptedException("boom")));
            IOException ioe = SmbFileInputStream.seToIoe(se);
            assertTrue(ioe instanceof InterruptedIOException);
            assertTrue(ioe.getMessage().contains("boom"));
        }
    }

     * is present.
     */
    @Test
    @DisplayName("toString with root cause contains stack trace")
    void testToStringWithRootCause() {
        RuntimeException cause = new RuntimeException("boom");
        SmbException ex = new SmbException(0, cause);
        assertTrue(ex.toString().contains("RuntimeException"), "String representation must include the root cause stack trace");
    }

    /**

        // First call throws, second accepts
        when(filter.accept(any())).thenThrow(new CIFSException("boom")).thenReturn(true);

        ShareEnumIterator it = new ShareEnumIterator(parent, entries.iterator(), filter);

        assertTrue(it.hasNext());
        SmbResource res = it.next();
        assertNotNull(res);