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diff --git a/test/lisp/mh-e/mh-xface-tests.el b/test/lisp/mh-e/mh-xface-tests.el
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+++ b/test/lisp/mh-e/mh-xface-tests.el
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+;;; mh-xface-tests.el --- tests for mh-xface.el -*- lexical-binding: t -*-
+
+;; Copyright (C) 2021 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/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'mh-xface)
+
+(ert-deftest mh-x-image-url-sane-p ()
+  "Test that `mh-x-image-url-sane-p' accepts a URL exactly if it is sane."
+  (should (equal (mh-x-image-url-sane-p (concat "http://"
+                                                (make-string 101 ?a)))
+                 nil))                  ;too long
+  (should (equal (mh-x-image-url-sane-p "http") nil)) ;too short
+  (should (equal (mh-x-image-url-sane-p "http:") t))
+  (should (equal (mh-x-image-url-sane-p "https") nil)) ;too short
+  (should (equal (mh-x-image-url-sane-p "https:") t))
+  (should (equal (mh-x-image-url-sane-p "https://www.example.com/me.png") t))
+  (should (equal (mh-x-image-url-sane-p "abcde:") nil)))
+
+(ert-deftest mh-x-image-url-cache-canonicalize ()
+  "Test `mh-x-image-url-cache-canonicalize'."
+  (should (equal (format "%s/%s" mh-x-image-cache-directory "%21foo%21bar.png")
+                 (mh-x-image-url-cache-canonicalize "/foo/bar")))
+  (should (equal (format "%s/%s" mh-x-image-cache-directory
+                         "http%3A%21%21domain.com%21foo%21bar.png")
+                 (mh-x-image-url-cache-canonicalize
+                  "http://domain.com/foo/bar")))
+  ;; All Windows invalid characters.
+  (should (equal (format "%s/%s" mh-x-image-cache-directory
+                         "%21%3C%3E%3A%2A%3F%22%5C%7C%21bar.png")
+                 (mh-x-image-url-cache-canonicalize "/<>:*?\"\\|/bar"))))
+
+;;; mh-xface-tests.el ends here