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+;;; time-tests.el --- Tests for time.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020-2022 Free Software Foundation, Inc.
+
+;; Author: Stefan Kangas <stefankangas@gmail.com>
+
+;; 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:
+
+;;; Code:
+
+(require 'ert)
+(require 'ert-x)
+(require 'time)
+
+(ert-deftest time-tests-display-time-mail-check-directory ()
+  (let ((display-time-mail-directory (ert-resource-directory)))
+    (should (display-time-mail-check-directory))))
+
+(ert-deftest time-tests-display-time-update--load ()
+  (let ((display-time-load-average 1)
+        (display-time-load-average-threshold 0))
+    (display-time-next-load-average)
+    (should (string-match (rx string-start " "
+                              (+ (| digit "."))
+                              string-end)
+                          (display-time-update--load))))
+  (let (display-time-load-average)
+    (should (equal (display-time-update--load) ""))))
+
+(ert-deftest time-tests-display-time-update ()
+  (let ((display-time-load-average 1)
+        (display-time-load-average-threshold 0)
+        display-time-string)
+    (display-time-update)
+    (should (string-match (rx string-start
+                              (? digit) digit ":" digit digit
+                              (? (| "AM" "PM"))
+                              " " (+ (| digit "."))
+                              (? " Mail")
+                              " "
+                              string-end)
+                          display-time-string))))
+
+(ert-deftest time-tests-display-time-file-nonempty-p ()
+  (should (display-time-file-nonempty-p (ert-resource-file "non-empty")))
+  (should-not (display-time-file-nonempty-p "/non/existent")))
+
+(ert-deftest time-tests-world-clock ()
+  (save-window-excursion
+    (world-clock)
+    (should (equal (buffer-name) world-clock-buffer-name))
+    (should (string-match "New York" (buffer-string)))))
+
+(ert-deftest time-tests-world-clock/revert-buffer-works ()
+  (save-window-excursion
+    (world-clock)
+    (revert-buffer)
+    (should (string-match "New York" (buffer-string)))))
+
+(ert-deftest time-tests-emacs-uptime ()
+  (should (string-match "^[0-9.]+ seconds?$" (emacs-uptime "%S"))))
+
+(ert-deftest time-tests-emacs-init-time ()
+  (should (string-match "^[0-9.]+ seconds?$" (emacs-init-time))))
+
+(provide 'time-tests)
+;;; time-tests.el ends here