tests(Unit): fix instantion of UserBackend

- also add missing import

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

Author: blizzz

tests/unit/Controller/SAMLControllerTest.php

@@ -26,6 +26,7 @@
 use OCP\IUserSession;
 use OCP\Security\ICrypto;
 use OCP\Security\ITrustedDomainHelper;
+use OCP\User\Events\UserLoggedInEvent;
 use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
 use Test\TestCase;
@@ -103,7 +104,8 @@ function ($param) {
 			$this->userResolver,
 			$this->userData,
 			$this->crypto,
-			$this->trustedDomainController
+			$this->trustedDomainController,
+			$this->eventDispatcher,
 		);
 	}