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diff --git a/test/lisp/thumbs-tests.el b/test/lisp/thumbs-tests.el
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+++ b/test/lisp/thumbs-tests.el
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+;;; thumbs-tests.el --- tests for thumbs.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 'thumbs)
+
+(ert-deftest thumbs-tests-thumbsdir/create-if-missing ()
+  (let ((thumbs-thumbsdir (make-temp-file "thumbs-test" t)))
+    (unwind-protect
+        (progn
+          (delete-directory thumbs-thumbsdir)
+          (should (file-directory-p (thumbs-thumbsdir))))
+      (delete-directory thumbs-thumbsdir))))
+
+(provide 'thumbs-tests)
+;;; thumbs-tests.el ends here