// 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

    /**
     * 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);