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diff --git a/test/lisp/emacs-lisp/easy-mmode-tests.el b/test/lisp/emacs-lisp/easy-mmode-tests.el
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+++ b/test/lisp/emacs-lisp/easy-mmode-tests.el
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+;;; easy-mmode-tests.el --- tests for easy-mmode.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2020-2021 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 'easy-mmode)
+(require 'message)
+
+(ert-deftest easy-mmode--globalized-predicate ()
+  (with-temp-buffer
+    (emacs-lisp-mode)
+    (should (eq (easy-mmode--globalized-predicate-p nil) nil))
+    (should (eq (easy-mmode--globalized-predicate-p t) t))
+    (should (eq (easy-mmode--globalized-predicate-p '(not text-mode)) t))
+    (should (eq (easy-mmode--globalized-predicate-p '(not text-mode)) t))
+    (should (eq (easy-mmode--globalized-predicate-p '((not text-mode))) nil))
+    (should (eq (easy-mmode--globalized-predicate-p '((not text-mode) t)) t))
+    (should (eq (easy-mmode--globalized-predicate-p
+                 '(c-mode emacs-lisp-mode))
+                t))
+    (mail-mode)
+    (should (eq (easy-mmode--globalized-predicate-p
+                 '(c-mode (not message-mode mail-mode) text-mode))
+                nil))
+    (text-mode)
+    (should (eq (easy-mmode--globalized-predicate-p
+                 '(c-mode (not message-mode mail-mode) text-mode))
+                t))))
+
+(define-minor-mode easy-mmode-test-mode "A test.")
+
+(ert-deftest easy-mmode--minor-mode ()
+  (with-temp-buffer
+    (should (eq easy-mmode-test-mode nil))
+    (easy-mmode-test-mode nil)
+    (should (eq easy-mmode-test-mode t))
+    (easy-mmode-test-mode -33)
+    (should (eq easy-mmode-test-mode nil))
+    (easy-mmode-test-mode 33)
+    (should (eq easy-mmode-test-mode t))
+    (easy-mmode-test-mode 'toggle)
+    (should (eq easy-mmode-test-mode nil))
+    (easy-mmode-test-mode 'toggle)
+    (should (eq easy-mmode-test-mode t))))
+
+(provide 'easy-mmode-tests)
+
+;;; easy-mmode-tests.el ends here