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diff --git a/tests/test-calendar-sync--parse-organizer.el b/tests/test-calendar-sync--parse-organizer.el
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+;;; test-calendar-sync--parse-organizer.el --- Tests for organizer parsing  -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Unit tests for calendar-sync--parse-organizer function.
+;; Parses ORGANIZER property line into plist (:cn NAME :email EMAIL).
+;; Covers Normal, Boundary, and Error cases.
+
+;;; Code:
+
+(require 'ert)
+(require 'testutil-calendar-sync)
+(require 'calendar-sync)
+
+;;; Normal Cases
+
+(ert-deftest test-calendar-sync--parse-organizer-normal-cn-and-email ()
+  "Test parsing organizer with both CN and email."
+  (let ((event "BEGIN:VEVENT\nORGANIZER;CN=John Smith:mailto:john@example.com\nSUMMARY:Test\nEND:VEVENT"))
+    (let ((result (calendar-sync--parse-organizer event)))
+      (should (string= "John Smith" (plist-get result :cn)))
+      (should (string= "john@example.com" (plist-get result :email))))))
+
+(ert-deftest test-calendar-sync--parse-organizer-normal-no-cn ()
+  "Test parsing organizer without CN."
+  (let ((event "BEGIN:VEVENT\nORGANIZER:mailto:organizer@example.com\nSUMMARY:Test\nEND:VEVENT"))
+    (let ((result (calendar-sync--parse-organizer event)))
+      (should (null (plist-get result :cn)))
+      (should (string= "organizer@example.com" (plist-get result :email))))))
+
+;;; Boundary Cases
+
+(ert-deftest test-calendar-sync--parse-organizer-boundary-no-organizer ()
+  "Test event without ORGANIZER returns nil."
+  (let ((event "BEGIN:VEVENT\nSUMMARY:Test\nDTSTART:20260210T140000Z\nEND:VEVENT"))
+    (should (null (calendar-sync--parse-organizer event)))))
+
+(ert-deftest test-calendar-sync--parse-organizer-boundary-complex-cn ()
+  "Test organizer with complex CN (quotes, special chars)."
+  (let ((event "BEGIN:VEVENT\nORGANIZER;CN=\"Dr. Jane O'Brien\":mailto:jane@example.com\nSUMMARY:Test\nEND:VEVENT"))
+    (let ((result (calendar-sync--parse-organizer event)))
+      (should (plist-get result :email)))))
+
+;;; Error Cases
+
+(ert-deftest test-calendar-sync--parse-organizer-error-nil-event ()
+  "Test nil event returns nil."
+  (should (null (calendar-sync--parse-organizer nil))))
+
+(provide 'test-calendar-sync--parse-organizer)
+;;; test-calendar-sync--parse-organizer.el ends here