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+;;; test-calendar-sync--occurrence-matches-exception-p.el --- Tests for occurrence-exception matching -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for calendar-sync--occurrence-matches-exception-p.
+;; Compares occurrence :start against exception :recurrence-id on year/month/day/hour/minute.
+
+;;; Code:
+
+(require 'ert)
+(require 'testutil-calendar-sync)
+(require 'calendar-sync)
+
+;;; Normal Cases
+
+(ert-deftest test-calendar-sync--occurrence-matches-exception-p-normal-exact-match ()
+  "Identical datetime in occurrence and exception returns t."
+  (let ((occ (list :start '(2026 3 15 14 0)))
+        (exc (list :recurrence-id '(2026 3 15 14 0))))
+    (should (calendar-sync--occurrence-matches-exception-p occ exc))))
+
+(ert-deftest test-calendar-sync--occurrence-matches-exception-p-normal-no-match ()
+  "Different dates return nil."
+  (let ((occ (list :start '(2026 3 15 14 0)))
+        (exc (list :recurrence-id '(2026 3 16 14 0))))
+    (should-not (calendar-sync--occurrence-matches-exception-p occ exc))))
+
+(ert-deftest test-calendar-sync--occurrence-matches-exception-p-normal-all-day ()
+  "All-day events (nil hour/minute) match when dates are equal."
+  (let ((occ (list :start '(2026 3 15 nil nil)))
+        (exc (list :recurrence-id '(2026 3 15 nil nil))))
+    (should (calendar-sync--occurrence-matches-exception-p occ exc))))
+
+;;; Boundary Cases
+
+(ert-deftest test-calendar-sync--occurrence-matches-exception-p-boundary-different-time ()
+  "Same date but different hour returns nil."
+  (let ((occ (list :start '(2026 3 15 14 0)))
+        (exc (list :recurrence-id '(2026 3 15 15 0))))
+    (should-not (calendar-sync--occurrence-matches-exception-p occ exc))))
+
+(ert-deftest test-calendar-sync--occurrence-matches-exception-p-boundary-nil-minute-vs-zero ()
+  "Nil minute treated as 0 for comparison."
+  (let ((occ (list :start '(2026 3 15 14 nil)))
+        (exc (list :recurrence-id '(2026 3 15 14 0))))
+    (should (calendar-sync--occurrence-matches-exception-p occ exc))))
+
+;;; Error Cases
+
+(ert-deftest test-calendar-sync--occurrence-matches-exception-p-error-nil-start ()
+  "Nil :start returns nil."
+  (let ((occ (list :summary "No start"))
+        (exc (list :recurrence-id '(2026 3 15 14 0))))
+    (should-not (calendar-sync--occurrence-matches-exception-p occ exc))))
+
+(provide 'test-calendar-sync--occurrence-matches-exception-p)
+;;; test-calendar-sync--occurrence-matches-exception-p.el ends here