update FakeManager

Signed-off-by: Robin Appelman <robin@icewind.nl>

tests/lib/Comments/FakeManager.php

@@ -1,6 +1,7 @@
 <?php
 
 namespace Test\Comments;
+use OCP\IUser;
 
 /**
  * Class FakeManager
@@ -44,4 +45,6 @@ class FakeManager implements \OCP\Comments\ICommentsManager {
 	public function registerDisplayNameResolver($type, \Closure $closure) {}
 
 	public function resolveDisplayName($type, $id) {}
+
+	public function getNumberOfUnreadCommentsForFolder($folderId, IUser $user) {}
 }