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diff --git a/test/lisp/custom-tests.el b/test/lisp/custom-tests.el
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+;;; custom-tests.el --- tests for custom.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2018 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+
+(ert-deftest custom-theme--load-path ()
+  "Test `custom-theme--load-path' behavior."
+  (let ((tmpdir (file-name-as-directory (make-temp-file "custom-tests-" t))))
+    (unwind-protect
+        ;; Create all temporary files under the same deletable parent.
+        (let ((temporary-file-directory tmpdir))
+          ;; Path is empty.
+          (let ((custom-theme-load-path ()))
+            (should (null (custom-theme--load-path))))
+
+          ;; Path comprises non-existent file.
+          (let* ((name (make-temp-name tmpdir))
+                 (custom-theme-load-path (list name)))
+            (should (not (file-exists-p name)))
+            (should (null (custom-theme--load-path))))
+
+          ;; Path comprises existing file.
+          (let* ((file (make-temp-file "file"))
+                 (custom-theme-load-path (list file)))
+            (should (file-exists-p file))
+            (should (not (file-directory-p file)))
+            (should (null (custom-theme--load-path))))
+
+          ;; Path comprises existing directory.
+          (let* ((dir (make-temp-file "dir" t))
+                 (custom-theme-load-path (list dir)))
+            (should (file-directory-p dir))
+            (should (equal (custom-theme--load-path) custom-theme-load-path)))
+
+          ;; Expand `custom-theme-directory' path element.
+          (let ((custom-theme-load-path '(custom-theme-directory)))
+            (let ((custom-theme-directory (make-temp-name tmpdir)))
+              (should (not (file-exists-p custom-theme-directory)))
+              (should (null (custom-theme--load-path))))
+            (let ((custom-theme-directory (make-temp-file "file")))
+              (should (file-exists-p custom-theme-directory))
+              (should (not (file-directory-p custom-theme-directory)))
+              (should (null (custom-theme--load-path))))
+            (let ((custom-theme-directory (make-temp-file "dir" t)))
+              (should (file-directory-p custom-theme-directory))
+              (should (equal (custom-theme--load-path)
+                             (list custom-theme-directory)))))
+
+          ;; Expand t path element.
+          (let ((custom-theme-load-path '(t)))
+            (let ((data-directory (make-temp-name tmpdir)))
+              (should (not (file-exists-p data-directory)))
+              (should (null (custom-theme--load-path))))
+            (let ((data-directory tmpdir)
+                  (themedir (expand-file-name "themes" tmpdir)))
+              (should (not (file-exists-p themedir)))
+              (should (null (custom-theme--load-path)))
+              (with-temp-file themedir)
+              (should (file-exists-p themedir))
+              (should (not (file-directory-p themedir)))
+              (should (null (custom-theme--load-path)))
+              (delete-file themedir)
+              (make-directory themedir)
+              (should (file-directory-p themedir))
+              (should (equal (custom-theme--load-path) (list themedir))))))
+      (when (file-directory-p tmpdir)
+        (delete-directory tmpdir t)))))
+
+;;; custom-tests.el ends here