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| | ;;; systime-tests.el -- tests for systime.c
;; Copyright (C) 2016-2018 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; This program 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.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
(require 'ert)
;;; Check format-time-string with various TZ settings.
;;; Use only POSIX-compatible TZ values, since the tests should work
;;; even if tzdb is not in use.
(ert-deftest format-time-string-with-zone ()
;; Don’t use (0 0 0 0) as the test case, as there are too many bugs
;; in MS-Windows (and presumably other) C libraries when formatting
;; time stamps near the Epoch of 1970-01-01 00:00:00 UTC, and this
;; test is for GNU Emacs, not for C runtimes. Instead, look before
;; you leap: "look" is the timestamp just before the first leap
;; second on 1972-06-30 23:59:60 UTC, so it should format to the
;; same string regardless of whether the underlying C library
;; ignores leap seconds, while avoiding circa-1970 glitches.
;;
;; Similarly, stick to the limited set of time zones that are
;; supported by both POSIX and MS-Windows: exactly 3 ASCII letters
;; in the abbreviation, and no DST.
(let ((look '(1202 22527 999999 999999))
(format "%Y-%m-%d %H:%M:%S.%3N %z (%Z)"))
;; UTC.
(should (string-equal
(format-time-string "%Y-%m-%d %H:%M:%S.%3N %z" look t)
"1972-06-30 23:59:59.999 +0000"))
;; "UTC0".
(should (string-equal
(format-time-string format look "UTC0")
"1972-06-30 23:59:59.999 +0000 (UTC)"))
;; Negative UTC offset, as a Lisp list.
(should (string-equal
(format-time-string format look '(-28800 "PST"))
"1972-06-30 15:59:59.999 -0800 (PST)"))
;; Negative UTC offset, as a Lisp integer.
(should (string-equal
(format-time-string format look -28800)
;; MS-Windows build replaces unrecognizable TZ values,
;; such as "-08", with "ZZZ".
(if (eq system-type 'windows-nt)
"1972-06-30 15:59:59.999 -0800 (ZZZ)"
"1972-06-30 15:59:59.999 -0800 (-08)")))
;; Positive UTC offset that is not an hour multiple, as a string.
(should (string-equal
(format-time-string format look "IST-5:30")
"1972-07-01 05:29:59.999 +0530 (IST)"))))
;;; This should not dump core.
(ert-deftest format-time-string-with-outlandish-zone ()
(should (stringp
(format-time-string "%Y-%m-%d %H:%M:%S.%3N %z" nil
(concat (make-string 2048 ?X) "0")))))
(defun systime-tests--have-leap-seconds ()
(string-equal (format-time-string "%Y-%m-%d %H:%M:%S" 78796800 t)
"1972-06-30 23:59:60"))
(ert-deftest format-time-string-with-bignum-on-32-bit ()
(should (or (string-equal
(format-time-string "%Y-%m-%d %H:%M:%S" (- (ash 1 31) 3600) t)
"2038-01-19 02:14:08")
(systime-tests--have-leap-seconds))))
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