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;;; test-calendar-sync--parse-rrule.el --- Tests for calendar-sync--parse-rrule -*- lexical-binding: t; -*-
;;; Commentary:
;; Unit tests for calendar-sync--parse-rrule function.
;; Tests parsing of iCalendar RRULE strings into plist format.
;;; Code:
(require 'ert)
(require 'calendar-sync)
;;; Setup and Teardown
(defun test-calendar-sync--parse-rrule-setup ()
"Setup for calendar-sync--parse-rrule tests."
;; No setup required for pure parsing tests
nil)
(defun test-calendar-sync--parse-rrule-teardown ()
"Teardown for calendar-sync--parse-rrule tests."
;; No teardown required
nil)
;;; Normal Cases
(ert-deftest test-calendar-sync--parse-rrule-normal-weekly-returns-plist ()
"Test parsing simple weekly recurrence rule."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=WEEKLY")))
(should (eq (plist-get result :freq) 'weekly))
(should (= (plist-get result :interval) 1)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-normal-weekly-with-byday-returns-plist ()
"Test parsing weekly recurrence with specific weekdays."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=WEEKLY;BYDAY=SA")))
(should (eq (plist-get result :freq) 'weekly))
(should (equal (plist-get result :byday) '("SA")))
(should (= (plist-get result :interval) 1)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-normal-daily-returns-plist ()
"Test parsing daily recurrence rule."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=DAILY")))
(should (eq (plist-get result :freq) 'daily))
(should (= (plist-get result :interval) 1)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-normal-monthly-returns-plist ()
"Test parsing monthly recurrence rule."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=MONTHLY")))
(should (eq (plist-get result :freq) 'monthly))
(should (= (plist-get result :interval) 1)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-normal-yearly-returns-plist ()
"Test parsing yearly recurrence rule."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=YEARLY")))
(should (eq (plist-get result :freq) 'yearly))
(should (= (plist-get result :interval) 1)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-normal-with-interval-returns-plist ()
"Test parsing recurrence rule with custom interval."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=WEEKLY;INTERVAL=2")))
(should (eq (plist-get result :freq) 'weekly))
(should (= (plist-get result :interval) 2)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-normal-with-count-returns-plist ()
"Test parsing recurrence rule with count limit."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=DAILY;COUNT=10")))
(should (eq (plist-get result :freq) 'daily))
(should (= (plist-get result :count) 10)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-normal-with-until-returns-plist ()
"Test parsing recurrence rule with end date."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let* ((result (calendar-sync--parse-rrule "FREQ=WEEKLY;UNTIL=20261118T120000Z"))
(until (plist-get result :until)))
(should (eq (plist-get result :freq) 'weekly))
(should (listp until))
(should (= (nth 0 until) 2026)) ; year
(should (= (nth 1 until) 11)) ; month
;; Day might be 17 or 18 depending on timezone conversion
(should (member (nth 2 until) '(17 18))))
(test-calendar-sync--parse-rrule-teardown)))
;;; Boundary Cases
(ert-deftest test-calendar-sync--parse-rrule-boundary-multiple-byday-returns-list ()
"Test parsing BYDAY with multiple weekdays."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=WEEKLY;BYDAY=MO,WE,FR")))
(should (eq (plist-get result :freq) 'weekly))
(should (equal (plist-get result :byday) '("MO" "WE" "FR"))))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-boundary-all-parameters-returns-plist ()
"Test parsing RRULE with all supported parameters."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=WEEKLY;INTERVAL=2;BYDAY=SA;UNTIL=20261118T000000Z;COUNT=52")))
(should (eq (plist-get result :freq) 'weekly))
(should (= (plist-get result :interval) 2))
(should (equal (plist-get result :byday) '("SA")))
(should (plist-get result :until))
(should (= (plist-get result :count) 52)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-boundary-interval-one-returns-default ()
"Test that default interval is 1 when not specified."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=DAILY")))
(should (= (plist-get result :interval) 1)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-boundary-large-interval-returns-number ()
"Test parsing RRULE with large interval value."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=MONTHLY;INTERVAL=12")))
(should (= (plist-get result :interval) 12)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-boundary-large-count-returns-number ()
"Test parsing RRULE with large count value."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=DAILY;COUNT=365")))
(should (= (plist-get result :count) 365)))
(test-calendar-sync--parse-rrule-teardown)))
;;; Error Cases
(ert-deftest test-calendar-sync--parse-rrule-error-empty-string-returns-plist ()
"Test parsing empty RRULE string returns plist with defaults."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "")))
(should (listp result))
(should (= (plist-get result :interval) 1)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-error-unsupported-freq-returns-symbol ()
"Test parsing RRULE with unsupported frequency."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=HOURLY")))
(should (eq (plist-get result :freq) 'hourly)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-error-invalid-until-returns-nil ()
"Test parsing RRULE with malformed UNTIL date."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=DAILY;UNTIL=invalid")))
(should (eq (plist-get result :freq) 'daily))
(should (null (plist-get result :until))))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-error-invalid-count-returns-zero ()
"Test parsing RRULE with non-numeric COUNT."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=DAILY;COUNT=abc")))
(should (eq (plist-get result :freq) 'daily))
(should (= (plist-get result :count) 0)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-error-invalid-interval-returns-zero ()
"Test parsing RRULE with non-numeric INTERVAL."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "FREQ=WEEKLY;INTERVAL=xyz")))
(should (eq (plist-get result :freq) 'weekly))
(should (= (plist-get result :interval) 0)))
(test-calendar-sync--parse-rrule-teardown)))
(ert-deftest test-calendar-sync--parse-rrule-error-missing-freq-returns-plist ()
"Test parsing RRULE without FREQ parameter."
(test-calendar-sync--parse-rrule-setup)
(unwind-protect
(let ((result (calendar-sync--parse-rrule "INTERVAL=2;COUNT=10")))
(should (listp result))
(should (null (plist-get result :freq)))
(should (= (plist-get result :interval) 2))
(should (= (plist-get result :count) 10)))
(test-calendar-sync--parse-rrule-teardown)))
(provide 'test-calendar-sync--parse-rrule)
;;; test-calendar-sync--parse-rrule.el ends here
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