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;;; test-calendar-sync--format-timezone-offset.el --- Tests for timezone offset formatting -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for calendar-sync--format-timezone-offset.
;; Converts offset seconds to human-readable "UTC±H:MM" strings.
;;; Code:
(require 'ert)
(require 'testutil-calendar-sync)
(require 'calendar-sync)
;;; Normal Cases
(ert-deftest test-calendar-sync--format-timezone-offset-normal-negative ()
"US Central (-6 hours) formats as UTC-6."
(should (equal "UTC-6" (calendar-sync--format-timezone-offset -21600))))
(ert-deftest test-calendar-sync--format-timezone-offset-normal-positive ()
"India (+5:30) formats as UTC+5:30."
(should (equal "UTC+5:30" (calendar-sync--format-timezone-offset 19800))))
(ert-deftest test-calendar-sync--format-timezone-offset-normal-utc ()
"Zero offset formats as UTC+0."
(should (equal "UTC+0" (calendar-sync--format-timezone-offset 0))))
;;; Boundary Cases
(ert-deftest test-calendar-sync--format-timezone-offset-boundary-half-hour ()
"Newfoundland (-3:30) includes minutes."
(should (equal "UTC-3:30" (calendar-sync--format-timezone-offset -12600))))
(ert-deftest test-calendar-sync--format-timezone-offset-boundary-large-offset ()
"UTC+14 (Line Islands) formats correctly."
(should (equal "UTC+14" (calendar-sync--format-timezone-offset 50400))))
;;; Error Cases
(ert-deftest test-calendar-sync--format-timezone-offset-error-nil ()
"Nil offset returns 'unknown'."
(should (equal "unknown" (calendar-sync--format-timezone-offset nil))))
(provide 'test-calendar-sync--format-timezone-offset)
;;; test-calendar-sync--format-timezone-offset.el ends here
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