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+;;; test-calendar-sync--get-all-property-lines.el --- Tests for get-all-property-lines  -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Unit tests for calendar-sync--get-all-property-lines function.
+;; Like get-property-line but returns ALL matching lines.
+;; Needed because ATTENDEE appears multiple times in an event.
+;; Covers Normal, Boundary, and Error cases.
+
+;;; Code:
+
+(require 'ert)
+(require 'testutil-calendar-sync)
+(require 'calendar-sync)
+
+;;; Normal Cases
+
+(ert-deftest test-calendar-sync--get-all-property-lines-normal-multiple ()
+  "Test extracting multiple ATTENDEE lines."
+  (let ((event "BEGIN:VEVENT\nATTENDEE;CN=Alice:mailto:alice@example.com\nATTENDEE;CN=Bob:mailto:bob@example.com\nEND:VEVENT"))
+    (let ((result (calendar-sync--get-all-property-lines event "ATTENDEE")))
+      (should (= 2 (length result)))
+      (should (string-match-p "Alice" (nth 0 result)))
+      (should (string-match-p "Bob" (nth 1 result))))))
+
+(ert-deftest test-calendar-sync--get-all-property-lines-normal-single ()
+  "Test extracting single matching line."
+  (let ((event "BEGIN:VEVENT\nATTENDEE;CN=Alice:mailto:alice@example.com\nSUMMARY:Test\nEND:VEVENT"))
+    (let ((result (calendar-sync--get-all-property-lines event "ATTENDEE")))
+      (should (= 1 (length result)))
+      (should (string-match-p "Alice" (car result))))))
+
+;;; Boundary Cases
+
+(ert-deftest test-calendar-sync--get-all-property-lines-boundary-no-match ()
+  "Test no matching property returns empty list."
+  (let ((event "BEGIN:VEVENT\nSUMMARY:Test\nEND:VEVENT"))
+    (should (null (calendar-sync--get-all-property-lines event "ATTENDEE")))))
+
+(ert-deftest test-calendar-sync--get-all-property-lines-boundary-continuation ()
+  "Test handling of continuation lines (lines starting with space)."
+  (let ((event "BEGIN:VEVENT\nATTENDEE;CN=Very Long Name;PARTSTAT=ACCEPTED:\n mailto:longname@example.com\nSUMMARY:Test\nEND:VEVENT"))
+    (let ((result (calendar-sync--get-all-property-lines event "ATTENDEE")))
+      (should (= 1 (length result)))
+      (should (string-match-p "longname@example.com" (car result))))))
+
+;;; Error Cases
+
+(ert-deftest test-calendar-sync--get-all-property-lines-error-nil-event ()
+  "Test nil event returns nil."
+  (should (null (calendar-sync--get-all-property-lines nil "ATTENDEE"))))
+
+(ert-deftest test-calendar-sync--get-all-property-lines-error-nil-property ()
+  "Test nil property returns nil."
+  (should (null (calendar-sync--get-all-property-lines "BEGIN:VEVENT\nEND:VEVENT" nil))))
+
+(ert-deftest test-calendar-sync--get-all-property-lines-error-empty-event ()
+  "Test empty event string returns nil."
+  (should (null (calendar-sync--get-all-property-lines "" "ATTENDEE"))))
+
+(provide 'test-calendar-sync--get-all-property-lines)
+;;; test-calendar-sync--get-all-property-lines.el ends here