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diff --git a/test/lisp/mail/mail-parse-tests.el b/test/lisp/mail/mail-parse-tests.el
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+;;; mail-parse-tests.el --- tests for mail-parse.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/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+(require 'mail-parse)
+(require 'subr-x)
+
+(ert-deftest test-mail-header-parse-address-lax ()
+  (should (equal (mail-header-parse-address-lax
+                  "Lars Ingebrigtsen <larsi@gnus.org>")
+                 '("larsi@gnus.org" . "Lars Ingebrigtsen")))
+  (should (equal (mail-header-parse-address-lax
+                  "Lars Ingebrigtsen larsi@gnus.org>")
+                 '("larsi@gnus.org" . "Lars Ingebrigtsen")))
+  (should (equal (mail-header-parse-address-lax
+                  "Lars Ingebrigtsen larsi@gnus.org")
+                 '("larsi@gnus.org" . "Lars Ingebrigtsen")))
+  (should (equal (mail-header-parse-address-lax
+                  "larsi@gnus.org (Lars Ingebrigtsen)")
+                 '("larsi@gnus.org " . "Lars Ingebrigtsen")))
+  (should (equal (mail-header-parse-address-lax "larsi@gnus.org")
+                 '("larsi@gnus.org")))
+  (should (equal (mail-header-parse-address-lax "foo")
+                 nil)))
+
+(ert-deftest test-mail-header-parse-addresses-lax ()
+  (should (equal (mail-header-parse-addresses-lax
+                  "Bob Weiner <rsw@gnu.org>, Mats Lidell <matsl@gnu.org>")
+                 '(("rsw@gnu.org" . "Bob Weiner")
+                   ("matsl@gnu.org" . "Mats Lidell")))))
+
+(provide 'mail-parse-tests)
+
+;;; mail-parse-tests.el ends here