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diff --git a/test/lisp/emacs-lisp/timer-tests.el b/test/lisp/emacs-lisp/timer-tests.el
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+;;; timer-tests.el --- tests for timers -*- lexical-binding:t -*-
+
+;; Copyright (C) 2013-2016 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(ert-deftest timer-tests-sit-for ()
+  (let ((timer-ran nil)
+        ;; Want sit-for behavior when interactive
+        (noninteractive nil))
+    (run-at-time '(0 0 0 0)
+                 nil
+                 (lambda () (setq timer-ran t)))
+    ;; The test assumes run-at-time didn't take the liberty of firing
+    ;; the timer, so assert the test's assumption
+    (should (not timer-ran))
+    (sit-for 0 t)
+    (should timer-ran)))
+
+(ert-deftest timer-tests-debug-timer-check ()
+  ;; This function exists only if --enable-checking.
+  (if (fboundp 'debug-timer-check)
+      (should (debug-timer-check)) t))
+
+;;; timer-tests.el ends here