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diff --git a/test/lisp/emacs-lisp/shadow-tests.el b/test/lisp/emacs-lisp/shadow-tests.el
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+;;; shadow-tests.el --- Test suite for shadow.  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2018-2022 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 'ert-x)
+(require 'shadow)
+(eval-when-compile (require 'cl-lib))
+
+(ert-deftest shadow-case-insensitive ()
+  "Test shadowing for case insensitive filenames."
+  ;; Override `file-name-case-insensitive-p' so we test the same thing
+  ;; regardless of what file system we're running on.
+  (cl-letf (((symbol-function 'file-name-case-insensitive-p) (lambda (_f) t)))
+    (should (equal (list (ert-resource-file "p1/foo")
+                         (ert-resource-file "p2/FOO"))
+                   (load-path-shadows-find
+                    (list (ert-resource-file "p1/")
+                          (ert-resource-file "p2/"))))))
+  (cl-letf (((symbol-function 'file-name-case-insensitive-p) (lambda (_f) nil)))
+    (should-not (load-path-shadows-find
+                 (list (ert-resource-file "p1/")
+                       (ert-resource-file "p2/"))))))
+
+;;; shadow-tests.el ends here.