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diff --git a/tests/test-calendar-sync--event-to-org.el b/tests/test-calendar-sync--event-to-org.el
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+;;; test-calendar-sync--event-to-org.el --- Tests for updated event-to-org formatter  -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Unit tests for calendar-sync--event-to-org function (updated version).
+;; Tests the new property drawer format with LOCATION, ORGANIZER, STATUS, URL.
+;; Covers Normal, Boundary, and Error cases.
+
+;;; Code:
+
+(require 'ert)
+(require 'testutil-calendar-sync)
+(require 'calendar-sync)
+
+;;; Normal Cases
+
+(ert-deftest test-calendar-sync--event-to-org-normal-all-fields ()
+  "Test event with all fields produces property drawer + description."
+  (let* ((start (test-calendar-sync-time-days-from-now 5 14 0))
+         (end (test-calendar-sync-time-days-from-now 5 15 0))
+         (event (list :summary "Team Standup"
+                      :start start
+                      :end end
+                      :description "Daily sync meeting"
+                      :location "Conference Room A"
+                      :organizer (list :cn "John Smith" :email "john@example.com")
+                      :status "accepted"
+                      :url "https://meet.google.com/abc-defg-hij")))
+    (let ((result (calendar-sync--event-to-org event)))
+      (should (string-match-p "\\* Team Standup" result))
+      (should (string-match-p ":PROPERTIES:" result))
+      (should (string-match-p ":LOCATION: Conference Room A" result))
+      (should (string-match-p ":ORGANIZER: John Smith" result))
+      (should (string-match-p ":STATUS: accepted" result))
+      (should (string-match-p ":URL: https://meet.google.com/abc-defg-hij" result))
+      (should (string-match-p ":END:" result))
+      (should (string-match-p "Daily sync meeting" result)))))
+
+(ert-deftest test-calendar-sync--event-to-org-normal-summary-and-time-only ()
+  "Test event with only summary and time (no drawer)."
+  (let* ((start (test-calendar-sync-time-days-from-now 5 14 0))
+         (end (test-calendar-sync-time-days-from-now 5 15 0))
+         (event (list :summary "Quick Chat"
+                      :start start
+                      :end end)))
+    (let ((result (calendar-sync--event-to-org event)))
+      (should (string-match-p "\\* Quick Chat" result))
+      (should-not (string-match-p ":PROPERTIES:" result)))))
+
+;;; Boundary Cases
+
+(ert-deftest test-calendar-sync--event-to-org-boundary-no-description ()
+  "Test event with location but no description."
+  (let* ((start (test-calendar-sync-time-days-from-now 5 14 0))
+         (end (test-calendar-sync-time-days-from-now 5 15 0))
+         (event (list :summary "Meeting"
+                      :start start
+                      :end end
+                      :location "Room B")))
+    (let ((result (calendar-sync--event-to-org event)))
+      (should (string-match-p ":LOCATION: Room B" result))
+      ;; After :END: there should be no body text
+      (should-not (string-match-p ":END:\n." result)))))
+
+(ert-deftest test-calendar-sync--event-to-org-boundary-no-location-no-attendees ()
+  "Test event without location or attendees produces no drawer."
+  (let* ((start (test-calendar-sync-time-days-from-now 5 14 0))
+         (end (test-calendar-sync-time-days-from-now 5 15 0))
+         (event (list :summary "Simple Event"
+                      :start start
+                      :end end
+                      :description "Just a note")))
+    (let ((result (calendar-sync--event-to-org event)))
+      (should (string-match-p "\\* Simple Event" result))
+      ;; Description goes after timestamp, no drawer needed
+      (should (string-match-p "Just a note" result)))))
+
+(ert-deftest test-calendar-sync--event-to-org-boundary-only-status ()
+  "Test event with only status produces drawer."
+  (let* ((start (test-calendar-sync-time-days-from-now 5 14 0))
+         (end (test-calendar-sync-time-days-from-now 5 15 0))
+         (event (list :summary "Status Only"
+                      :start start
+                      :end end
+                      :status "tentative")))
+    (let ((result (calendar-sync--event-to-org event)))
+      (should (string-match-p ":PROPERTIES:" result))
+      (should (string-match-p ":STATUS: tentative" result))
+      (should (string-match-p ":END:" result)))))
+
+(ert-deftest test-calendar-sync--event-to-org-boundary-description-with-asterisks ()
+  "Test event description containing org-special asterisks."
+  (let* ((start (test-calendar-sync-time-days-from-now 5 14 0))
+         (end (test-calendar-sync-time-days-from-now 5 15 0))
+         (event (list :summary "Meeting"
+                      :start start
+                      :end end
+                      :description "* agenda item 1\n** sub-item")))
+    (let ((result (calendar-sync--event-to-org event)))
+      ;; Description should be present
+      (should (string-match-p "agenda item" result)))))
+
+(ert-deftest test-calendar-sync--event-to-org-boundary-organizer-email-only ()
+  "Test organizer without CN shows email."
+  (let* ((start (test-calendar-sync-time-days-from-now 5 14 0))
+         (end (test-calendar-sync-time-days-from-now 5 15 0))
+         (event (list :summary "Meeting"
+                      :start start
+                      :end end
+                      :organizer (list :cn nil :email "org@example.com"))))
+    (let ((result (calendar-sync--event-to-org event)))
+      (should (string-match-p ":ORGANIZER: org@example.com" result)))))
+
+;;; Error Cases
+
+(ert-deftest test-calendar-sync--event-to-org-error-missing-summary ()
+  "Test event with nil summary still produces output."
+  (let* ((start (test-calendar-sync-time-days-from-now 5 14 0))
+         (end (test-calendar-sync-time-days-from-now 5 15 0))
+         (event (list :summary nil
+                      :start start
+                      :end end)))
+    ;; Should not error - produce some output
+    (should (stringp (calendar-sync--event-to-org event)))))
+
+(provide 'test-calendar-sync--event-to-org)
+;;; test-calendar-sync--event-to-org.el ends here