* test/lisp/mail/rfc822-tests.el: New file.

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diff --git a/test/lisp/mail/rfc822-tests.el b/test/lisp/mail/rfc822-tests.el
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+;;; rfc822-tests.el --- Tests for rfc822.el  -*- lexical-binding:t -*-
+
+;; Copyright (C) 2020 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 'rfc822)
+
+(defmacro rfc822-tests-deftest (email desc &optional valid)
+  `(ert-deftest ,(intern (format "rfc822-email-%s-%s"
+                                 (if valid "valid" "invalid")
+                                 desc)) ()
+     (if ,valid
+         (should (equal (rfc822-addresses ,email) (list ,email)))
+       (let ((addresses (rfc822-addresses ,email)))
+         ;; `rfc822-addresses' returns a string if parsing fails.
+         (while (and (consp addresses)
+                     (not (eq (string-to-char (car addresses)) ?\()))
+           (setq addresses (cdr addresses)))
+         ;; Found saved error.
+         (should (= (length addresses) 1))))))
+
+;;;; Valid emails
+
+(rfc822-tests-deftest "email@example.org" "email" t)
+(rfc822-tests-deftest "firstname.lastname@example.org" "dot-in-address" t)
+(rfc822-tests-deftest "email@subdomain.example.org" "dot-in-subdomain" t)
+(rfc822-tests-deftest "firstname+lastname@example.org" "contains-plus-sign" t)
+(rfc822-tests-deftest "email@123.123.123.123" "domain-valid-ip" t)
+(rfc822-tests-deftest "email@[123.123.123.123]" "domain-valid-ip-square-bracket" t)
+(rfc822-tests-deftest "\"email\"@example.org" "quotes-around-email" t)
+(rfc822-tests-deftest "1234567890@example.org" "digits-in-address" t)
+(rfc822-tests-deftest "email@example-one.com" "dash-in-domain-name" t)
+(rfc822-tests-deftest "_______@example.org" "underscore-in-address" t)
+(rfc822-tests-deftest "email@example.name" "dotname-tld" t)
+(rfc822-tests-deftest "email@example.co.jp" "dot-in-tld" t)
+(rfc822-tests-deftest "firstname-lastname@example.org" "dash-in-address" t)
+(rfc822-tests-deftest "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiklm@example.org" "address-long" t)
+
+;;;; Invalid emails
+
+(rfc822-tests-deftest "#@%^%#$@#$@#.com" "garbage")
+(rfc822-tests-deftest "@example.org" "missing-username")
+(rfc822-tests-deftest "email@example@example.org" "two-at-signs")
+(rfc822-tests-deftest ".email@example.org" "address-leading-dot")
+(rfc822-tests-deftest "email.@example.org" "address-trailing-dot")
+(rfc822-tests-deftest "email..email@example.org" "address-multiple-dots")
+(rfc822-tests-deftest "email@example..org" "domain-multiple-dots")
+(rfc822-tests-deftest "email@example.org." "domain-trailing-dot")
+(rfc822-tests-deftest "email@.example.org" "domain-leading-dot")
+(rfc822-tests-deftest "test\\@test@example.org" "address-escaped-at-sign")
+
+;; FIXME: Should these fail?
+;; (rfc822-tests-deftest "plainaddress" "missing-at-sign-and-domain")
+;; (rfc822-tests-deftest "email@example.org (J. Random Hacker)" "text-following-email")
+;; (rfc822-tests-deftest "email@-example.org" "leading-dash-in-domain-is-invalid")
+;; (rfc822-tests-deftest "email@example-.org" "trailing-dash-in-domain-is-invalid")
+;; (rfc822-tests-deftest "あいうえお@example.org" "address-unicode-chars")
+;; (rfc822-tests-deftest "email.example.org" "missing-at")
+;; (rfc822-tests-deftest "email@111.222.333.44444" "invalid-IP-format")
+;; (rfc822-tests-deftest "email@domain" "missing-top-level-domain")
+;; (rfc822-tests-deftest "email@domain.web" ".web-is-not-a-valid-top-level-domain")
+
+(provide 'rfc822-tests)
+;;; rfc822-tests.el ends here