when(mockReferral.getNode()).thenReturn("\\server\\share\\path");

            String reqPath = "\\\\server\\share\\path";
            // Use valid consumed value within string bounds (reqPath.length() = 19)
            int consumed = Math.min(19, reqPath.length());

            data1 = DfsReferralDataImpl.fromReferral(mockReferral, reqPath, System.currentTimeMillis() + 10000, consumed);

        // Edge-like Windows UNC-style: a single backslash in the path
        String reqPath = "\\";
        String resolved = "smb://server/share/path";
        when(locator.handleDFSReferral(referral, reqPath)).thenReturn(resolved);

        String out = locator.handleDFSReferral(referral, reqPath);
        assertEquals(resolved, out);

        // Verify exact argument interaction

                log.debug("Server " + dr.server + " path " + reqPath + " remain " + reqPath.substring(consumed) + " path consumed "
                        + consumed);
            }
            dr.pathConsumed = consumed;
        } else {
            if (log.isDebugEnabled()) {
                log.debug("Node " + ref.getNode() + " path " + reqPath + " remain " + reqPath.substring(consumed) + " path consumed "

    /**
     * Internal: for testing only
     *
     * @param dr the DFS referral data to process
     * @param reqPath the requested path to resolve
     * @return resolved unc path
     */
    String handleDFSReferral(DfsReferralData dr, String reqPath);

    }

    /**
     * @param dr
     * @param reqPath
     * @return UNC path the redirect leads to
     */
    @Override
    public String handleDFSReferral(final DfsReferralData dr, final String reqPath) {
        if (Objects.equals(this.dfsReferral, dr)) {
            return this.unc;
        }
        this.dfsReferral = dr;

        do {
            r = start.next();
            final String refPath = dr.getPath() != null ? '\\' + dr.getPath() : "";
            final String nextPath = refPath + (path != null ? path.substring(r.getPathConsumed()) : "");
            if (log.isDebugEnabled()) {
                log.debug(String.format("Intermediate referral, server %s share %s refPath %s origPath %s nextPath %s", r.getServer(),