assertEquals("dfs-share", l.getShare());

        // Path consumed negative -> coerced to 0
        when(dr.getPathConsumed()).thenReturn(-1);
        String unc2 = l.handleDFSReferral(dr, null);
        assertTrue(unc2.contains("dfs/path") || unc2.contains("dfs\\path"));
    }

    @Test
    @DisplayName("toString includes URL and cached fields")
    void testToString() {

            strictValidator.validatePath("//server\u0001/share");
        });

        // Note: Proper UNC validation would require fixing the normalization to preserve \\
        // for UNC paths. Current implementation can't distinguish UNC paths after normalization.
    }

    @Test
    public void testInvalidUncServerName() throws Exception {

    public String getUNCPath() {
        if (this.unc == null) {
            canonicalizePath();
        }
        return this.unc;
    }

    @Override
    public String getURLPath() {
        if (this.unc == null) {
            canonicalizePath();
        }
        return this.canon;
    }

    @Override
    public String getShare() {
        if (this.unc == null) {
            canonicalizePath();

        return normalized;
    }

    /**
     * Validate UNC path
     */
    private void validateUncPath(String path) throws SmbException {
        // UNC path should have format: \\server\share[\path]
        if (!path.startsWith("\\\\") && !path.startsWith("//")) {
            throw new SmbException("Invalid UNC path format");
        }

        String[] parts = path.substring(2).split("[\\\\/]");

        // Test UNC path with special characters
        String specialUNCPath = "\\\\server\\share\\folder with spaces\\file!@#$.txt";
        testImplementation.setFullUNCPath("DOMAIN", "server", specialUNCPath);
        assertEquals(specialUNCPath, testImplementation.getFullUNCPath());
    }

    @Test
    @DisplayName("Test with various UNC path formats")
    void testVariousUNCPathFormats() {

                    if (log.isDebugEnabled()) {
                        log.debug("treeConnect: unc=" + unc + ",service=" + svc);
                    }

                    if (transport.isSMB2()) {
                        final Smb2TreeConnectRequest req = new Smb2TreeConnectRequest(sess.getConfig(), unc);
                        if (andx != null) {
                            req.chain((ServerMessageBlock2) andx);

            } catch (final SmbException se) {
                fp = 0L;
            }
        }
        if (file instanceof SmbNamedPipe && file.unc.startsWith("\\pipe\\")) {
            file.unc = file.unc.substring(5);
            file.send(new TransWaitNamedPipe("\\pipe" + file.unc), new TransWaitNamedPipeResponse());
        }
        file.open(openFlags, access | SmbConstants.FILE_WRITE_DATA, SmbFile.ATTR_NORMAL, 0);

        verify(tree, times(1)).acquire();
        verify(tree, times(1)).release(); // closed after failure
    }

    @Test
    @DisplayName("open(): invalid UNC without trailing backslash throws SmbException")
    void invalidUncThrows() throws Exception {
        // Override the default setup for this specific test

    void setUp() {
        lenient().when(tree.getConfig()).thenReturn(config);
    }

    private SmbPipeHandleImpl newHandleWithBasicStubs(int pipeType, String unc) {
        when(pipe.getPipeType()).thenReturn(pipeType);
        when(pipe.getUncPath()).thenReturn(unc);
        return new SmbPipeHandleImpl(pipe);
    }

    @Test
    @DisplayName("ensureTreeConnected acquires and reuses the tree handle")

    void getDfsReferrals_happy() throws Exception {
        when(transport.getDfsReferrals(any(), any(), any(), any(), anyInt())).thenReturn(referral);

        String name = "\\\\server\\\\share\\\\path"; // UNC-like DFS path
        String host = "server.example";
        String domain = "EXAMPLE";
        int rn = 0;

        jcifs.DfsReferralData result = transport.getDfsReferrals(ctx, name, host, domain, rn);