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diff --git a/test/lisp/mail/uudecode-tests.el b/test/lisp/mail/uudecode-tests.el
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+;;; uudecode-tests.el --- Tests for uudecode.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2019-2022 Free Software Foundation, Inc.
+
+;; Author: Stefan Kangas <stefankangas@gmail.com>
+
+;; 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 'ert)
+(require 'ert-x)
+(require 'uudecode)
+
+(defun uudecode-tests-read-file (file)
+  "Read contents of FILE and return as string."
+  (with-temp-buffer
+    (insert-file-contents file)
+    (buffer-string)))
+
+(defvar uudecode-tests-encoded-str
+  (uudecode-tests-read-file (ert-resource-file "uuencoded.txt"))
+  "Uuencoded data for bookmark-tests.el.
+Same as `uudecode-tests-decoded-str' but uuencoded.")
+(defvar uudecode-tests-decoded-str
+  (uudecode-tests-read-file (ert-resource-file "uudecoded.txt"))
+  "Plain text data for bookmark-tests.el.
+Same as `uudecode-tests-encoded-str' but plain text.")
+
+(ert-deftest uudecode-tests-decode-region-internal ()
+  ;; Write to buffer
+  (with-temp-buffer
+    (insert uudecode-tests-encoded-str)
+    (uudecode-decode-region-internal (point-min) (point-max))
+    (should (equal (buffer-string) uudecode-tests-decoded-str)))
+  ;; Write to file
+  (with-temp-buffer
+    (ert-with-temp-file tmpfile
+      (insert uudecode-tests-encoded-str)
+      (uudecode-decode-region-internal (point-min) (point-max) tmpfile)
+      (should (equal (uudecode-tests-read-file tmpfile)
+                     uudecode-tests-decoded-str)))))
+
+(ert-deftest uudecode-tests-decode-region-external ()
+  ;; Write to buffer
+  (when uudecode-use-external
+    (with-temp-buffer
+      (insert uudecode-tests-encoded-str)
+      (uudecode-decode-region-external (point-min) (point-max))
+      (should (equal (buffer-string) uudecode-tests-decoded-str)))
+    ;; Write to file
+    (with-temp-buffer
+      (ert-with-temp-file tmpfile
+        (insert uudecode-tests-encoded-str)
+        (uudecode-decode-region-external (point-min) (point-max) tmpfile)
+        (should (equal (uudecode-tests-read-file tmpfile)
+                       uudecode-tests-decoded-str))))))
+
+(provide 'uudecode-tests)
+;;; uudecode-tests.el ends here