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diff --git a/test/src/fileio-tests.el b/test/src/fileio-tests.el
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+;;; 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 <https://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))
+            (when (and (eq system-type 'cygwin) (eq char 92))
+              (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."
+  ;; Some Windows versions don't support symlinks, and those which do
+  ;; will pop up UAC elevation prompts, so we disable this test on
+  ;; MS-Windows.
+  (skip-unless (not (eq system-type 'windows-nt)))
+  (should (equal nil (fileio-tests--symlink-failure))))
+
+(ert-deftest fileio-tests--directory-file-name ()
+  (should (equal (directory-file-name "/") "/"))
+  (should (equal (directory-file-name "//") "//"))
+  (should (equal (directory-file-name "///") "/"))
+  (should (equal (directory-file-name "////") "/"))
+  (should (equal (directory-file-name "/abc") "/abc"))
+  (should (equal (directory-file-name "/abc/") "/abc"))
+  (should (equal (directory-file-name "/abc//") "/abc")))
+
+(ert-deftest fileio-tests--directory-file-name-dos-nt ()
+  "Like fileio-tests--directory-file-name, but for DOS_NT systems."
+  (skip-unless (memq system-type '(ms-dos windows-nt)))
+  (should (equal (directory-file-name "d:/") "d:/"))
+  (should (equal (directory-file-name "d://") "d:/"))
+  (should (equal (directory-file-name "d:///") "d:/"))
+  (should (equal (directory-file-name "d:////") "d:/"))
+  (should (equal (directory-file-name "d:/abc") "d:/abc"))
+  (should (equal (directory-file-name "d:/abc/") "d:/abc"))
+  (should (equal (directory-file-name "d:/abc//") "d:/abc")))
+
+(ert-deftest fileio-tests--file-name-as-directory ()
+  (should (equal (file-name-as-directory "") "./"))
+  (should (equal (file-name-as-directory "/") "/"))
+  (should (equal (file-name-as-directory "//") "//"))
+  (should (equal (file-name-as-directory "///") "///"))
+  (should (equal (file-name-as-directory "////") "////"))
+  (should (equal (file-name-as-directory "/abc") "/abc/"))
+  (should (equal (file-name-as-directory "/abc/") "/abc/"))
+  (should (equal (file-name-as-directory "/abc//") "/abc//")))
+
+(ert-deftest fileio-tests--file-name-as-directory-dos-nt ()
+  "Like fileio-tests--file-name-as-directory, but for DOS_NT systems."
+  (skip-unless (memq system-type '(ms-dos windows-nt)))
+  (should (equal (file-name-as-directory "d:/") "d:/"))
+  (should (equal (file-name-as-directory "d:\\") "d:/"))
+  (should (equal (file-name-as-directory "d://") "d://"))
+  (should (equal (file-name-as-directory "d:///") "d:///"))
+  (should (equal (file-name-as-directory "d:////") "d:////"))
+  (should (equal (file-name-as-directory "d:\\\\\\\\") "d:////"))
+  (should (equal (file-name-as-directory "d:/abc") "d:/abc/"))
+  (should (equal (file-name-as-directory "D:\\abc") "d:/abc/"))
+  (should (equal (file-name-as-directory "d:/abc/") "d:/abc/"))
+  (should (equal (file-name-as-directory "D:\\abc/") "d:/abc/"))
+  (should (equal (file-name-as-directory "D:/abc//") "d:/abc//")))