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diff --git a/test/lisp/mh-e/mh-limit-tests.el b/test/lisp/mh-e/mh-limit-tests.el
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+++ b/test/lisp/mh-e/mh-limit-tests.el
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+;;; mh-limit-tests.el --- tests for mh-limit.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-limit)
+
+(ert-deftest mh-pick-args-list ()
+  "Test `mh-pick-args-list'."
+  (should (equal '() (mh-pick-args-list "")))
+  (should (equal '("-subject" "a") (mh-pick-args-list "-subject a")))
+  (should (equal '("-subject" "a") (mh-pick-args-list "  -subject   a  ")))
+  (should (equal '("-subject" "a" "-from" "b")
+                 (mh-pick-args-list "-subject a -from b")))
+  (should (equal '("-subject" "a b" "-from" "c d")
+                 (mh-pick-args-list "-subject a b -from c d"))))
+
+;;; mh-limit-tests.el ends here