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+;;; url-handlers-test.el --- Test suite for url-handlers.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2018-2019 Free Software Foundation, Inc.
+
+;; Author: Nicolas Petton <nicolas@petton.fr>
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+(require 'url-handlers)
+
+(defmacro with-url-handler-mode (&rest body)
+  "Evaluate BODY with `url-handler-mode' turned on."
+  (declare (indent 0) (debug t))
+  (let ((url-handler-mode-active (make-symbol "url-handler-mode-active")))
+    `(let ((,url-handler-mode-active url-handler-mode))
+       (unwind-protect
+           (progn
+             (unless ,url-handler-mode-active
+               (url-handler-mode))
+             ,@body)
+         (unless ,url-handler-mode-active
+           (url-handler-mode -1))))))
+
+(ert-deftest url-handlers-file-name-directory/preserve-url-types ()
+  (with-url-handler-mode
+    (should (equal (file-name-directory "https://gnu.org/index.html")
+                   "https://gnu.org/"))
+    (should (equal (file-name-directory "http://gnu.org/index.html")
+                   "http://gnu.org/"))
+    (should (equal (file-name-directory "ftp://gnu.org/index.html")
+                   "ftp://gnu.org/"))))
+
+(ert-deftest url-handlers-file-name-directory/should-not-handle-non-url-file-names ()
+  (with-url-handler-mode
+    (should-not (equal (file-name-directory "not-uri://gnu.org")
+                   "not-uri://gnu.org/"))))
+
+(ert-deftest url-handlers-file-name-directory/sub-directories ()
+  (with-url-handler-mode
+    (should (equal (file-name-directory "https://foo/bar/baz/index.html")
+                   "https://foo/bar/baz/"))))
+
+(ert-deftest url-handlers-file-name-directory/file-urls ()
+  (with-url-handler-mode
+    (should (equal (file-name-directory "file:///foo/bar/baz.txt")
+                   "file:///foo/bar/"))
+    (should (equal (file-name-directory "file:///")
+                   "file:///"))))
+
+;; Regression test for bug#30444
+(ert-deftest url-handlers-file-name-directory/no-filename ()
+  (with-url-handler-mode
+    (should (equal (file-name-directory "https://foo.org")
+                   "https://foo.org/"))
+    (should (equal (file-name-directory "https://foo.org/")
+                   "https://foo.org/"))))
+
+(provide 'url-handlers-test)
+;;; url-handlers-test.el ends here