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;;; test-calendar-sync--expand-yearly.el --- Tests for calendar-sync--expand-yearly -*- lexical-binding: t; -*-
;;; Commentary:
;; Characterization tests for calendar-sync--expand-yearly.
;; Captures current behavior before refactoring into unified expand function.
;; Uses dynamic timestamps to avoid hardcoded dates.
;;; Code:
(require 'ert)
(require 'testutil-calendar-sync)
(require 'calendar-sync)
;;; Normal Cases
(ert-deftest test-calendar-sync--expand-yearly-normal-generates-occurrences ()
"Test expanding yearly event generates occurrences within range."
(let* ((start-date (test-calendar-sync-time-days-ago 800 10 0))
(end-date (test-calendar-sync-time-days-ago 800 11 0))
(base-event (list :summary "Birthday"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
;; Range covers ~1.25 years, event started ~2.2 years ago
;; Should see 1-2 occurrences in range
(should (>= (length occurrences) 1))
(should (<= (length occurrences) 3))))
(ert-deftest test-calendar-sync--expand-yearly-normal-preserves-date ()
"Test that each occurrence falls on the same month and day."
(let* ((start-date (test-calendar-sync-time-days-ago 1100 10 0))
(end-date (test-calendar-sync-time-days-ago 1100 11 0))
(expected-month (nth 1 start-date))
(expected-day (nth 2 start-date))
(base-event (list :summary "Anniversary"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
(should (> (length occurrences) 0))
(dolist (occ occurrences)
(let ((s (plist-get occ :start)))
(should (= (nth 1 s) expected-month))
(should (= (nth 2 s) expected-day))))))
(ert-deftest test-calendar-sync--expand-yearly-normal-preserves-time ()
"Test that each occurrence preserves the original event time."
(let* ((start-date (test-calendar-sync-time-days-ago 400 15 30))
(end-date (test-calendar-sync-time-days-ago 400 16 30))
(base-event (list :summary "Yearly"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1 :count 5))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
(dolist (occ occurrences)
(let ((s (plist-get occ :start)))
(should (= (nth 3 s) 15))
(should (= (nth 4 s) 30))))))
(ert-deftest test-calendar-sync--expand-yearly-normal-interval-two ()
"Test expanding bi-yearly event."
(let* ((start-date (test-calendar-sync-time-days-ago 2000 10 0))
(end-date (test-calendar-sync-time-days-ago 2000 11 0))
(base-event (list :summary "Bi-Yearly"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 2))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
;; Over ~5.5 years, bi-yearly = ~2-3 total, 0-1 in range
(should (<= (length occurrences) 2))))
;;; Boundary Cases
(ert-deftest test-calendar-sync--expand-yearly-boundary-count-limits-occurrences ()
"Test that COUNT limits the total number of occurrences."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "Limited"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1 :count 3))
;; Use a very wide range to capture all 3 years
(range (list (time-subtract (current-time) (* 90 86400))
(time-add (current-time) (* 1460 86400))))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
(should (= (length occurrences) 3))))
(ert-deftest test-calendar-sync--expand-yearly-boundary-until-limits-occurrences ()
"Test that UNTIL date stops expansion."
(let* ((start-date (test-calendar-sync-time-days-ago 1000 10 0))
(end-date (test-calendar-sync-time-days-ago 1000 11 0))
(until-date (test-calendar-sync-time-date-only 365))
(base-event (list :summary "Until-Limited"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1 :until until-date))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
;; Should have occurrences within range but stopped by UNTIL
(should (>= (length occurrences) 1))
(should (<= (length occurrences) 3))))
(ert-deftest test-calendar-sync--expand-yearly-boundary-count-one-returns-single ()
"Test that COUNT=1 returns exactly one occurrence."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "Once"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1 :count 1))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
(should (= (length occurrences) 1))))
(ert-deftest test-calendar-sync--expand-yearly-boundary-respects-date-range ()
"Test that occurrences outside date range are excluded."
(let* ((start-date (test-calendar-sync-time-days-ago 1500 10 0))
(end-date (test-calendar-sync-time-days-ago 1500 11 0))
(base-event (list :summary "Ranged"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1))
(range (test-calendar-sync-narrow-range))
(occurrences (calendar-sync--expand-yearly base-event rrule range))
(range-start (nth 0 range))
(range-end (nth 1 range)))
(dolist (occ occurrences)
(let* ((s (plist-get occ :start))
(occ-time (test-calendar-sync-date-to-time-value s)))
(should (time-less-p range-start occ-time))
(should (time-less-p occ-time range-end))))))
(ert-deftest test-calendar-sync--expand-yearly-boundary-preserves-summary ()
"Test that each occurrence carries the original summary."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "Annual Gala"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1 :count 2))
(range (list (time-subtract (current-time) (* 90 86400))
(time-add (current-time) (* 1460 86400))))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
(dolist (occ occurrences)
(should (equal (plist-get occ :summary) "Annual Gala")))))
;;; Error Cases
(ert-deftest test-calendar-sync--expand-yearly-error-past-until-returns-empty ()
"Test that UNTIL in the past produces no occurrences in future range."
(let* ((start-date (test-calendar-sync-time-days-ago 1500 10 0))
(end-date (test-calendar-sync-time-days-ago 1500 11 0))
(until-date (test-calendar-sync-time-date-only-ago 365))
(base-event (list :summary "Past"
:start start-date
:end end-date))
(rrule (list :freq 'yearly :interval 1 :until until-date))
(range (list (time-subtract (current-time) (* 30 86400))
(time-add (current-time) (* 365 86400))))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
(should (= (length occurrences) 0))))
(ert-deftest test-calendar-sync--expand-yearly-error-no-end-time-still-works ()
"Test that event without :end still generates occurrences."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(base-event (list :summary "No End" :start start-date))
(rrule (list :freq 'yearly :interval 1 :count 2))
(range (list (time-subtract (current-time) (* 90 86400))
(time-add (current-time) (* 1460 86400))))
(occurrences (calendar-sync--expand-yearly base-event rrule range)))
(should (= (length occurrences) 2))))
(provide 'test-calendar-sync--expand-yearly)
;;; test-calendar-sync--expand-yearly.el ends here
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