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diff --git a/test/lisp/progmodes/subword-tests.el b/test/lisp/progmodes/subword-tests.el
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+;;; subword-tests.el --- Testing the subword rules
+
+;; Copyright (C) 2011-2015 Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+;; Keywords:
+
+;; This program 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.
+
+;; This program 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'ert)
+(require 'subword)
+
+(defconst subword-tests-strings
+  '("ABC^" ;;Bug#13758
+    "ABC^ ABC^Foo^ ABC^-Foo^ toto^ ABC^"))
+
+(ert-deftest subword-tests ()
+  "Test the `subword-mode' rules."
+  (with-temp-buffer
+    (dolist (str subword-tests-strings)
+      (erase-buffer)
+      (insert str)
+      (goto-char (point-min))
+      (while (search-forward "^" nil t)
+        (replace-match ""))
+      (goto-char (point-min))
+      (while (not (eobp))
+        (subword-forward 1)
+        (insert "^"))
+      (should (equal (buffer-string) str)))))
+
+(ert-deftest subword-tests2 ()
+  "Test that motion in subword-mode stops at the right places."
+
+  (let* ((line "fooBarBAZ quXD g_TESTThingAbc word BLAH test")
+         (fwrd "*  *  *  *  * * *    *    *  *    *    *    *")
+         (bkwd "*  *  *   * *  * *   *    *   *    *    *   *"))
+
+    (with-temp-buffer
+      (subword-mode 1)
+      (insert line)
+
+      ;; Test forward motion.
+      
+      (goto-char (point-min))
+      (let ((stops (make-string (length fwrd) ?\ )))
+        (while (progn
+                 (aset stops (1- (point)) ?\*)
+                 (not (eobp)))          
+          (forward-word))
+        (should (equal stops fwrd)))
+
+      ;; Test backward motion.
+
+      (goto-char (point-max))
+      (let ((stops (make-string (length bkwd) ?\ )))
+        (while (progn
+                 (aset stops (1- (point)) ?\*)
+                 (not (bobp)))          
+          (backward-word))
+        (should (equal stops bkwd))))))
+
+(provide 'subword-tests)
+;;; subword-tests.el ends here