* test/lisp/image/image-dired-util-tests.el: New file.

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diff --git a/test/lisp/image/image-dired-util-tests.el b/test/lisp/image/image-dired-util-tests.el
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+;;; image-dired-util-tests.el --- Tests for image-dired.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2022 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 'image-dired)
+(require 'image-dired-util)
+
+(ert-deftest image-dired-thumb-name ()
+  (let ((image-dired-thumbnail-storage 'standard))
+    (should (file-name-absolute-p (image-dired-thumb-name "foo.jpg")))
+    (should (equal (file-name-nondirectory (image-dired-thumb-name "foo.jpg"))
+                   "4abfc97f9a5d3c4c519bfb23e4da8b90.png")))
+  (let ((image-dired-thumbnail-storage 'image-dired))
+    (should (file-name-absolute-p (image-dired-thumb-name "foo.jpg")))
+    (should (equal (file-name-nondirectory (image-dired-thumb-name "foo.jpg"))
+                   "foo_5baffb8d7984b3088db58efd7d8909c5.thumb.jpg")))
+  (let ((image-dired-thumbnail-storage 'per-directory))
+    (should (file-name-absolute-p (image-dired-thumb-name "foo.jpg")))
+    (should (equal (file-name-nondirectory (image-dired-thumb-name "foo.jpg"))
+                   "foo.thumb.jpg"))))
+
+;;; image-dired-util-tests.el ends here