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diff --git a/test/lisp/calendar/lunar-tests.el b/test/lisp/calendar/lunar-tests.el
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+++ b/test/lisp/calendar/lunar-tests.el
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+;;; lunar-tests.el --- tests for calendar/lunar.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/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'lunar)
+
+(defmacro with-lunar-test (&rest body)
+  `(let ((calendar-latitude 40.1)
+         (calendar-longitude -88.2)
+         (calendar-location-name "Paris")
+         (calendar-time-zone 0)
+         (calendar-standard-time-zone-name "UTC")
+         ;; Make sure daylight saving is disabled to avoid interference
+         ;; from the system settings (see bug#45818).
+         (calendar-daylight-savings-starts nil)
+         (calendar-time-display-form '(24-hours ":" minutes)))
+     ,@body))
+
+(ert-deftest lunar-test-phase ()
+  (with-lunar-test
+   (should (equal (lunar-phase 1)
+                  '((1 8 1900) "05:40" 1 "")))))
+
+(ert-deftest lunar-test-eclipse-check ()
+  (with-lunar-test
+   (should (equal (eclipse-check 1 1) "**  Eclipse **"))))
+
+(ert-deftest lunar-test-phase-list ()
+  (with-lunar-test
+   (should (equal  (lunar-phase-list 3 1871)
+                   '(((3 21 1871) "04:03" 0 "")
+                     ((3 29 1871) "06:46" 1 "**  Eclipse **")
+                     ((4 5 1871) "14:20" 2 "")
+                     ((4 12 1871) "05:57" 3 "**  Eclipse possible **")
+                     ((4 19 1871) "19:06" 0 "")
+                     ((4 27 1871) "23:49" 1 "")
+                     ((5 4 1871) "22:57" 2 "")
+                     ((5 11 1871) "14:29" 3 "")
+                     ((5 19 1871) "10:46" 0 "")
+                     ((5 27 1871) "13:02" 1 ""))))))
+
+(ert-deftest lunar-test-new-moon-time ()
+  (with-lunar-test
+   (should (= (round (lunar-new-moon-time 1))
+              2451580))))
+
+(ert-deftest lunar-test-new-moon-on-or-after ()
+  (with-lunar-test
+   (should (= (round (lunar-new-moon-on-or-after (calendar-absolute-from-gregorian '(5 5 1818))))
+              664525))))
+
+(provide 'lunar-tests)
+;;; lunar-tests.el ends here