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| | ;;; timefns-tests.el -- tests for timefns.c
;; Copyright (C) 2016-2019 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 and decode-time 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 ((format "%Y-%m-%d %H:%M:%S.%3N %z (%Z)"))
(dolist (look '((1202 22527 999999 999999)
(7879679999900 . 100000)
(78796799999999999999 . 1000000000000)))
;; UTC.
(let ((subsec (time-subtract (time-convert look t)
(time-convert look 'integer))))
(should (string-equal
(format-time-string "%Y-%m-%d %H:%M:%S.%3N %z" look t)
"1972-06-30 23:59:59.999 +0000"))
(should (equal (decode-time look t)
(list 59 59 23 30 6 1972 5 nil 0 subsec)))
;; "UTC0".
(should (string-equal
(format-time-string format look "UTC0")
"1972-06-30 23:59:59.999 +0000 (UTC)"))
(should (equal (decode-time look "UTC0")
(list 59 59 23 30 6 1972 5 nil 0 subsec)))
;; 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)"))
(should (equal (decode-time look '(-28800 "PST"))
(list 59 59 15 30 6 1972 5 nil -28800 subsec)))
;; 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)")))
(should (equal (decode-time look -28800)
(list 59 59 15 30 6 1972 5 nil -28800 subsec)))
;; 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)"))
(should (equal (decode-time look "IST-5:30")
(list 59 29 5 1 7 1972 6 nil 19800 subsec)))))))
(ert-deftest decode-then-encode-time ()
(let ((time-values (list 0 -2 1 0.0 -0.0 -2.0 1.0
most-negative-fixnum most-positive-fixnum
(1- most-negative-fixnum)
(1+ most-positive-fixnum)
1e+INF -1e+INF 1e+NaN -1e+NaN
'(0 1 0 0) '(1 0 0 0) '(-1 0 0 0)
'(123456789000000 . 1000000)
(cons (1+ most-positive-fixnum) 1000000000000)
(cons 1000000000000 (1+ most-positive-fixnum)))))
(dolist (a time-values)
(let* ((d (ignore-errors (decode-time a t)))
(e (if d (encode-time d)))
(diff (float-time (time-subtract a e))))
(should (or (not d)
(and (<= 0 diff) (< diff 1))))))))
;;; 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 timefns-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")
(timefns-tests--have-leap-seconds))))
(ert-deftest time-equal-p-nil-nil ()
(should (time-equal-p nil nil)))
(ert-deftest time-arith-tests ()
(let ((time-values (list 0 -1 1 0.0 -0.0 -1.0 1.0
most-negative-fixnum most-positive-fixnum
(1- most-negative-fixnum)
(1+ most-positive-fixnum)
1e+INF -1e+INF 1e+NaN -1e+NaN
'(0 0 0 1) '(0 0 1 0) '(0 1 0 0) '(1 0 0 0)
'(-1 0 0 0) '(1 2 3 4) '(-1 2 3 4)
'(-123456789 . 100000) '(123456789 . 1000000)
(cons (1+ most-positive-fixnum) 1000000000000)
(cons 1000000000000 (1+ most-positive-fixnum)))))
(dolist (a time-values)
(dolist (b time-values)
(let ((aa (time-subtract (time-add a b) b)))
(should (or (time-equal-p a aa) (and (floatp aa) (isnan aa)))))
(should (= 1 (+ (if (time-less-p a b) 1 0)
(if (time-equal-p a b) 1 0)
(if (time-less-p b a) 1 0)
(if (or (and (floatp a) (isnan a))
(and (floatp b) (isnan b)))
1 0))))
(should (or (not (time-less-p 0 b))
(time-less-p a (time-add a b))
(time-equal-p a (time-add a b))
(and (floatp (time-add a b)) (isnan (time-add a b)))))
(let ((x (float-time (time-add a b)))
(y (+ (float-time a) (float-time b))))
(should (or (and (isnan x) (isnan y))
(= x y)
(< 0.99 (/ x y) 1.01)
(< 0.99 (/ (- (float-time a)) (float-time b))
1.01))))))))
(ert-deftest time-rounding-tests ()
(should (time-equal-p 1e-13 (time-add 0 1e-13))))
(ert-deftest encode-time-dst-numeric-zone ()
"Check for Bug#35502."
(should (time-equal-p
(encode-time '(29 31 17 30 4 2019 2 t 7200 0))
'(23752 27217))))
(ert-deftest float-time-precision ()
(should (< 0 (float-time '(1 . 10000000000))))
(should (< (float-time '(-1 . 10000000000)) 0))
(let ((x 1.0))
(while (not (zerop x))
(dolist (multiplier '(-1.9 -1.5 -1.1 -1 1 1.1 1.5 1.9))
(let ((xmult (* x multiplier)))
(should (= xmult (float-time (time-convert xmult t))))))
(setq x (/ x 2))))
(let ((x 1.0))
(while (ignore-errors (time-convert x t))
(dolist (divisor '(-1.9 -1.5 -1.1 -1 1 1.1 1.5 1.9))
(let ((xdiv (/ x divisor)))
(should (= xdiv (float-time (time-convert xdiv t))))))
(setq x (* x 2)))))
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