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Diffstat (limited to 'tests/test-calendar-sync--convert-tz-to-local.el')
| -rw-r--r-- | tests/test-calendar-sync--convert-tz-to-local.el | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/tests/test-calendar-sync--convert-tz-to-local.el b/tests/test-calendar-sync--convert-tz-to-local.el new file mode 100644 index 00000000..cf45aa61 --- /dev/null +++ b/tests/test-calendar-sync--convert-tz-to-local.el @@ -0,0 +1,225 @@ +;;; test-calendar-sync--convert-tz-to-local.el --- Tests for timezone conversion -*- lexical-binding: t; -*- + +;;; Commentary: +;; Unit tests for calendar-sync--convert-tz-to-local function. +;; Tests conversion from named timezones to local time. +;; Uses `date` command as reference implementation for verification. +;; Covers Normal, Boundary, and Error cases. + +;;; Code: + +(require 'ert) +(require 'calendar-sync) +(require 'testutil-calendar-sync) + +;;; Normal Cases + +(ert-deftest test-calendar-sync--convert-tz-to-local-normal-lisbon-to-local () + "Test converting Europe/Lisbon time to local. +Europe/Lisbon is UTC+0 in winter, UTC+1 in summer. +Uses date command as reference for expected result." + (let* ((source-tz "Europe/Lisbon") + (year 2026) (month 2) (day 2) (hour 19) (minute 0) + ;; Get expected result from date command + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) ; Sanity check that date command worked + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-normal-yerevan-to-local () + "Test converting Asia/Yerevan time to local. +Asia/Yerevan is UTC+4 year-round." + (let* ((source-tz "Asia/Yerevan") + (year 2026) (month 2) (day 2) (hour 20) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-normal-utc-to-local () + "Test converting UTC time to local." + (let* ((source-tz "UTC") + (year 2026) (month 2) (day 2) (hour 19) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-normal-new-york-to-local () + "Test converting America/New_York time to local." + (let* ((source-tz "America/New_York") + (year 2026) (month 2) (day 2) (hour 14) (minute 30) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-normal-tokyo-to-local () + "Test converting Asia/Tokyo time to local. +Asia/Tokyo is UTC+9 year-round (no DST)." + (let* ((source-tz "Asia/Tokyo") + (year 2026) (month 2) (day 2) (hour 10) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +;;; Boundary Cases + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-crosses-date-forward () + "Test conversion that crosses to next day. +Late evening in Europe becomes next day morning in Americas." + (let* ((source-tz "Europe/London") + (year 2026) (month 2) (day 2) (hour 23) (minute 30) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-crosses-date-backward () + "Test conversion that crosses to previous day. +Early morning in Asia becomes previous day evening in Americas." + (let* ((source-tz "Asia/Tokyo") + (year 2026) (month 2) (day 3) (hour 2) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-midnight () + "Test conversion of midnight (00:00) in source timezone." + (let* ((source-tz "Europe/Paris") + (year 2026) (month 2) (day 2) (hour 0) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-2359 () + "Test conversion of 23:59 in source timezone." + (let* ((source-tz "Europe/Berlin") + (year 2026) (month 2) (day 2) (hour 23) (minute 59) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-dst-spring-forward () + "Test conversion during US DST spring-forward transition. +March 8, 2026 at 2:30 AM doesn't exist in America/Chicago (skipped)." + ;; Use a time AFTER the transition to avoid the gap + (let* ((source-tz "America/New_York") + (year 2026) (month 3) (day 8) (hour 15) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-dst-fall-back () + "Test conversion during fall-back DST transition. +November 1, 2026 at 1:30 AM exists twice in America/Chicago." + (let* ((source-tz "America/New_York") + (year 2026) (month 11) (day 1) (hour 14) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-etc-gmt-plus () + "Test conversion from Etc/GMT+5 (note: Etc/GMT+N is UTC-N)." + (let* ((source-tz "Etc/GMT+5") + (year 2026) (month 2) (day 2) (hour 12) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-month-boundary () + "Test conversion that crosses month boundary." + (let* ((source-tz "Pacific/Auckland") ; UTC+12/+13 + (year 2026) (month 2) (day 1) (hour 5) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-year-boundary () + "Test conversion that crosses year boundary." + (let* ((source-tz "Pacific/Auckland") + (year 2026) (month 1) (day 1) (hour 5) (minute 0) + (expected (test-calendar-sync-convert-tz-via-date + year month day hour minute source-tz)) + (result (calendar-sync--convert-tz-to-local + year month day hour minute source-tz))) + (should expected) + (should result) + (should (equal expected result)))) + +;;; Error Cases + +(ert-deftest test-calendar-sync--convert-tz-to-local-boundary-invalid-timezone-falls-back () + "Test that invalid timezone falls back to treating time as local. +The `date` command doesn't error on unrecognized timezones - it ignores +the TZ specification and treats the input as local time. This is acceptable +because calendar providers (Google, Proton) always use valid IANA timezones. +This test documents the fallback behavior rather than testing for nil." + (let ((result (calendar-sync--convert-tz-to-local + 2026 2 2 19 0 "Invalid/Timezone"))) + ;; Should return something (falls back to local interpretation) + (should result) + ;; The time values should be present (year month day hour minute) + (should (= 5 (length result))))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-error-nil-timezone () + "Test that nil timezone returns nil." + (let ((result (calendar-sync--convert-tz-to-local + 2026 2 2 19 0 nil))) + (should (null result)))) + +(ert-deftest test-calendar-sync--convert-tz-to-local-error-empty-timezone () + "Test that empty timezone string returns nil." + (let ((result (calendar-sync--convert-tz-to-local + 2026 2 2 19 0 ""))) + (should (null result)))) + +(provide 'test-calendar-sync--convert-tz-to-local) +;;; test-calendar-sync--convert-tz-to-local.el ends here |