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+;;; cl-seq-tests.el --- Tests for cl-seq.el functionality  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2015-2016 Free Software Foundation, Inc.
+
+;; Author: Nicolas Richard <youngfrog@members.fsf.org>
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-seq)
+
+(ert-deftest cl-union-test-00 ()
+  (let ((str1 "foo")
+        (str2 (make-string 3 ?o)))
+    ;; Emacs may make two string literals eql when reading.
+    (aset str2 0 ?f)
+    (should (not (eql str1 str2)))
+    (should (equal str1 str2))
+    (should (equal (cl-union (list str1) (list str2))
+                   (list str2)))
+    (should (equal (cl-union (list str1) (list str2) :test 'eql)
+                   (list str1 str2)))))
+
+(provide 'cl-seq-tests)
+;;; cl-seq-tests.el ends here