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diff --git a/tests/test-calendar-sync--extract-cn.el b/tests/test-calendar-sync--extract-cn.el
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+;;; test-calendar-sync--extract-cn.el --- Tests for CN parameter extraction -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for calendar-sync--extract-cn.
+;; Extracts and dequotes the CN= parameter from iCal property lines.
+
+;;; Code:
+
+(require 'ert)
+(require 'testutil-calendar-sync)
+(require 'calendar-sync)
+
+;;; Normal Cases
+
+(ert-deftest test-calendar-sync--extract-cn-normal-unquoted ()
+  "Extracts unquoted CN value."
+  (should (equal "Craig Jennings"
+                 (calendar-sync--extract-cn
+                  "ATTENDEE;CN=Craig Jennings;PARTSTAT=ACCEPTED:mailto:c@test.com"))))
+
+(ert-deftest test-calendar-sync--extract-cn-normal-quoted ()
+  "Strips surrounding quotes from CN value."
+  (should (equal "Craig Jennings"
+                 (calendar-sync--extract-cn
+                  "ATTENDEE;CN=\"Craig Jennings\";PARTSTAT=ACCEPTED:mailto:c@test.com"))))
+
+;;; Boundary Cases
+
+(ert-deftest test-calendar-sync--extract-cn-boundary-cn-at-end ()
+  "CN as last parameter before colon."
+  (should (equal "Bob"
+                 (calendar-sync--extract-cn "ORGANIZER;CN=Bob:mailto:bob@test.com"))))
+
+(ert-deftest test-calendar-sync--extract-cn-boundary-special-chars ()
+  "CN with accented characters."
+  (should (equal "José García"
+                 (calendar-sync--extract-cn
+                  "ATTENDEE;CN=José García;PARTSTAT=ACCEPTED:mailto:j@test.com"))))
+
+;;; Error Cases
+
+(ert-deftest test-calendar-sync--extract-cn-error-no-cn ()
+  "Line without CN= returns nil."
+  (should (null (calendar-sync--extract-cn
+                 "ATTENDEE;PARTSTAT=ACCEPTED:mailto:c@test.com"))))
+
+(provide 'test-calendar-sync--extract-cn)
+;;; test-calendar-sync--extract-cn.el ends here