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;;; solar-tests.el --- tests for solar.el -*- lexical-binding: t -*-
;; Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
(require 'ert)
(require 'solar)
(ert-deftest solar-sunrise-sunset ()
;; Bug#44237: wrong sunrise time on Dec 30 and 31, 2020 for Jaipur.
(let ((calendar-latitude 26.9)
(calendar-longitude 75.8)
(calendar-time-zone +330)
(calendar-standard-time-zone-name "IST")
(calendar-daylight-time-zone-name "IST")
(epsilon (/ 60.0))) ; Minute accuracy is good enough.
(let* ((sunrise-sunset (solar-sunrise-sunset '(12 30 2020)))
(sunrise (car (nth 0 sunrise-sunset)))
(sunset (car (nth 1 sunrise-sunset))))
(should (< (abs (- sunrise 7.27)) epsilon))
(should (< (abs (- sunset 17.72)) epsilon)))
(let* ((sunrise-sunset (solar-sunrise-sunset '(12 31 2020)))
(sunrise (car (nth 0 sunrise-sunset)))
(sunset (car (nth 1 sunrise-sunset))))
(should (< (abs (- sunrise 7.28)) epsilon))
(should (< (abs (- sunset 17.72)) epsilon)))))
(provide 'solar-tests)
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