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diff --git a/test/lisp/so-long-tests/autoload-minor-mode-tests.el b/test/lisp/so-long-tests/autoload-minor-mode-tests.el
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+;;; autoload-minor-mode-tests.el --- Test suite for so-long.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019-2022 Free Software Foundation, Inc.
+
+;; Author: Phil Sainty <psainty@orcon.net.nz>
+;; Keywords: convenience
+
+;; 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)
+(load (expand-file-name "so-long-tests-helpers"
+                        (file-name-directory (or load-file-name
+                                                 default-directory))))
+
+(declare-function so-long-tests-remember "so-long-tests-helpers")
+(declare-function so-long-tests-assert-and-revert "so-long-tests-helpers")
+(defvar so-long-action)
+
+;; We're testing the initial state.  We could alternatively use
+;; `unload-feature' to revert to that, but this option is simple.
+
+(autoload 'so-long "so-long")
+
+(ert-deftest so-long-tests-autoload-minor-mode ()
+  "File-local -*- so-long-action: so-long-minor-mode; eval: (so-long) -*-"
+  (with-temp-buffer
+    (display-buffer (current-buffer))
+    (so-long-tests-remember)
+    (insert "-*- so-long-action: so-long-minor-mode; eval: (so-long) -*-\n")
+    (put 'so-long-action 'safe-local-variable #'symbolp)
+    (push '(eval . (so-long)) safe-local-variable-values)
+    (hack-local-variables)
+    (should (eq so-long-action 'so-long-minor-mode))
+    (so-long-tests-assert-and-revert 'so-long-minor-mode)))
+
+;;; autoload-minor-mode-tests.el ends here