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diff --git a/test/misc/test-custom-noloads.el b/test/misc/test-custom-noloads.el
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+;;; test-custom-noloads.el --- Test custom noloads  -*- 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/>.
+
+;;; Commentary:
+
+;; The command `cus-test-noloads' returns a list of variables which
+;; are somewhere declared as custom options, but not loaded by
+;; `custom-load-symbol'.
+
+;;; Code:
+
+(require 'ert)
+
+(defconst custom-test-admin-cus-test
+  (expand-file-name "admin/cus-test.el" source-directory))
+
+(declare-function cus-test-noloads custom-test-admin-cus-test)
+(defvar cus-test-vars-not-cus-loaded)  ; from admin/cus-tests.el
+
+;; FIXME: Multiple failures here.
+(ert-deftest custom-test-load ()
+  :tags '(:expensive-test :unstable)
+  :expected-result :failed ; FIXME: See above.
+  (skip-unless (file-readable-p custom-test-admin-cus-test))
+  (load custom-test-admin-cus-test)
+  (cus-test-noloads)
+  (should-not cus-test-vars-not-cus-loaded))
+
+;;; test-custom-noloads.el ends here