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diff --git a/test/lisp/mail/rfc2047-tests.el b/test/lisp/mail/rfc2047-tests.el
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+;;; rfc2047-tests.el --- tests for rfc2047.el -*- lexical-binding: t -*-
+
+;; Copyright (C) 2019-2022 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/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'rfc2047)
+
+(defun test-rfc2047 (before after)
+  (with-temp-buffer
+    (insert before)
+    (goto-char (point-min))
+    (rfc2047-fold-field)
+    (should (equal (buffer-string) after))))
+
+(ert-deftest test-rfc2047-fold-short ()
+  (test-rfc2047
+   "Organization: Lots Of Short Words Here Lots Of Short Words Here Lots Of Short Words Here\n"
+
+   "Organization: Lots Of Short Words Here Lots Of Short Words Here Lots Of
+ Short Words Here
+"))
+
+(ert-deftest test-rfc2047-fold-encoded ()
+  (test-rfc2047
+   "Subject: This is =?utf-8?Q?=C3=A1?= long subject that's =?utf-8?Q?v=C3=A9ry?= long and =?utf-8?Q?ver=C3=BD?= encoded yes indeed it =?utf-8?Q?=C3=ADs?=\n"
+   "Subject: This is =?utf-8?Q?=C3=A1?= long subject that's
+ =?utf-8?Q?v=C3=A9ry?= long and =?utf-8?Q?ver=C3=BD?= encoded yes indeed it
+ =?utf-8?Q?=C3=ADs?=
+"))
+
+(ert-deftest test-rfc2047-fold-long ()
+  (test-rfc2047
+   "Organization: verylongverylongverylongverylongverylongverylongverylongverylongverylongword and then\n"
+   "Organization: verylongverylongverylongverylongverylongverylongverylongverylongverylongword
+ and then
+"))
+
+(ert-deftest test-rfc2047-fold-long-short ()
+  (test-rfc2047
+   "Organization: verylongverylongverylongverylongverylongverylongverylongverylongverylongword\n"
+   "Organization: verylongverylongverylongverylongverylongverylongverylongverylongverylongword\n"))
+
+;;; rfc2047-tests.el ends here