test(integration): add tests for calendar delegation

Signed-off-by: Hamza <hamzamahjoubi221@gmail.com>

Author: hamza221

build/integration/dav_features/caldav-delegation.feature

@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
+Feature: calendar delegation
+  Calendar delegation grants another user/principal control of a calendar account,
+  including all calendars the delegator can access.
+
+  Scenario: admin grants user0 read access to her calendar account
+    Given user "admin" exists
+    And user "user0" exists
+    When "admin" updates property "{DAV:}group-member-set" to href "/remote.php/dav/principals/users/user0" of principal "users/admin/calendar-proxy-read" on the endpoint "/remote.php/dav/principals/"
+    Then The CalDAV response should be multi status
+    And The CalDAV response should contain an href "/remote.php/dav/principals/users/admin/calendar-proxy-read"
+    And The CalDAV response should contain a property "{DAV:}group-member-set"
+
+  Scenario: admin grants write access to her calendar account
+    Given user "admin" exists
+    And user "user0" exists
+    When "admin" updates property "{DAV:}group-member-set" to href "/remote.php/dav/principals/users/user0" of principal "users/admin/calendar-proxy-write" on the endpoint "/remote.php/dav/principals/"
+    Then The CalDAV response should be multi status
+    And The CalDAV response should contain an href "/remote.php/dav/principals/users/admin/calendar-proxy-write"
+    And The CalDAV response should contain a property "{DAV:}group-member-set"

build/integration/features/bootstrap/CalDavContext.php

@@ -172,6 +172,26 @@ public function theCaldavResponseShouldContainAPropertyWithHrefValue(
 		}
 	}
 
+	/**
+	 * @Then The CalDAV response should contain an href :href
+	 * @throws \Exception
+	 */
+	public function theCaldavResponseShouldContainAnHref(string $href): void {
+		/** @var \Sabre\DAV\Xml\Response\MultiStatus $multiStatus */
+		$multiStatus = $this->responseXml['value'];
+		foreach ($multiStatus->getResponses() as $response) {
+			if ($response->getHref() === $href) {
+				return;
+			}
+		}
+		throw new \Exception(
+			sprintf(
+				'Expected href %s not found in response',
+				$href,
+			)
+		);
+	}
+
 	/**
 	 * @Then The CalDAV response should be multi status
 	 * @throws \Exception