;;; unit tests for src/fileio.c      -*- lexical-binding: t; -*-

;; Copyright 2017 Free Software Foundation, Inc.

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

(require 'ert)

(defun try-link (target link)
  (make-symbolic-link target link)
  (let* ((read-link (file-symlink-p link))
         (failure (unless (string-equal target read-link)
                    (list 'string-equal target read-link))))
    (delete-file link)
    failure))

(defun fileio-tests--symlink-failure ()
  (let* ((dir (make-temp-file "fileio" t))
         (link (expand-file-name "link" dir)))
    (unwind-protect
        (let (failure
              (char 0))
          (while (and (not failure) (< char 127))
            (setq char (1+ char))
            (setq failure (try-link (string char) link)))
          (or failure
              (try-link "/:" link)))
      (delete-directory dir t))))

(ert-deftest fileio-tests--odd-symlink-chars ()
  "Check that any non-NULL ASCII character can appear in a symlink.
Also check that an encoding error can appear in a symlink."
  (should (equal nil (fileio-tests--symlink-failure))))