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diff --git a/test/lisp/url/url-file-tests.el b/test/lisp/url/url-file-tests.el
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+;;; url-file-tests.el --- Test suite for url-file. -*- lexical-binding: t -*-
+
+;; Copyright (C) 2018-2022 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/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'url-file)
+(require 'ert)
+(require 'ert-x)
+
+(ert-deftest url-file ()
+  "Test reading file via file:/// URL."
+  (let* ((file (ert-resource-file "file.txt"))
+         (uri-prefix (if (eq (aref file 0) ?/) "file://" "file:///")))
+    (should (equal
+             (with-current-buffer
+                 (url-file (url-generic-parse-url (concat uri-prefix file))
+                           #'ignore nil)
+               (prog1 (buffer-substring (point) (point-max))
+                 (kill-buffer)))
+             (with-temp-buffer
+               (insert-file-contents-literally file)
+               (buffer-string))))))
+
+(provide 'url-file-tests)
+
+;;; url-file-tests.el ends here