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;;; cal-julian-tests.el --- tests for calendar/cal-julian.el -*- lexical-binding:t -*-
;; Copyright (C) 2020-2025 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 'cal-julian)
(ert-deftest cal-julian-test-to-absolute ()
(should (equal (calendar-gregorian-from-absolute
(calendar-julian-to-absolute
'(10 25 1917)))
'(11 7 1917))))
(ert-deftest cal-julian-test-from-absolute ()
(should (equal (calendar-julian-from-absolute
(calendar-absolute-from-gregorian
'(11 7 1917)))
'(10 25 1917))))
(ert-deftest cal-julian-test-date-string ()
(should (equal (let ((calendar-date-display-form calendar-iso-date-display-form))
(calendar-julian-date-string '(11 7 1917)))
"1917-10-25")))
(defmacro with-cal-julian-test (&rest body)
`(save-window-excursion
(unwind-protect
(progn
(calendar)
,@body)
(kill-buffer calendar-buffer))))
(ert-deftest cal-julian-test-goto-date ()
(with-cal-julian-test
(calendar-julian-goto-date '(10 25 1917))
(should (looking-at "7"))))
(ert-deftest cal-julian-test-astro-to-and-from-absolute ()
(should (= (+ (calendar-astro-to-absolute 0.0)
(calendar-astro-from-absolute 0.0))
0.0)))
(ert-deftest cal-julian-calendar-astro-date-string ()
(should (equal (calendar-astro-date-string '(10 25 1917)) "2421527")))
(ert-deftest calendar-astro-goto-day-number ()
(with-cal-julian-test
(calendar-astro-goto-day-number 2421527)
(backward-char)
(should (looking-at "25"))))
(provide 'cal-julian-tests)
;;; cal-julian-tests.el ends here
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