diff --git a/apps/files_external/tests/Controller/GlobalStoragesControllerTest.php b/apps/files_external/tests/Controller/GlobalStoragesControllerTest.php
index 4c318951d1b..00125dc0b7b 100644
--- a/apps/files_external/tests/Controller/GlobalStoragesControllerTest.php
+++ b/apps/files_external/tests/Controller/GlobalStoragesControllerTest.php
@@ -49,7 +49,8 @@ class GlobalStoragesControllerTest extends StoragesControllerTest {
 			$this->createMock(LoggerInterface::class),
 			$session,
 			$this->createMock(IGroupManager::class),
-			$config
+			$config,
+			$this->backendService,
 		);
 	}
 
diff --git a/apps/files_external/tests/Controller/StoragesControllerTest.php b/apps/files_external/tests/Controller/StoragesControllerTest.php
index 0d604ff2d47..b9adf083d19 100644
--- a/apps/files_external/tests/Controller/StoragesControllerTest.php
+++ b/apps/files_external/tests/Controller/StoragesControllerTest.php
@@ -9,10 +9,12 @@ namespace OCA\Files_External\Tests\Controller;
 use OCA\Files_External\Controller\GlobalStoragesController;
 use OCA\Files_External\Lib\Auth\AuthMechanism;
 use OCA\Files_External\Lib\Backend\Backend;
+use OCA\Files_External\Lib\Backend\Local;
 use OCA\Files_External\Lib\StorageConfig;
 
 use OCA\Files_External\MountConfig;
 use OCA\Files_External\NotFoundException;
+use OCA\Files_External\Service\BackendService;
 use OCA\Files_External\Service\GlobalStoragesService;
 use OCA\Files_External\Service\UserStoragesService;
 use OCP\AppFramework\Http;
@@ -29,9 +31,23 @@ abstract class StoragesControllerTest extends \Test\TestCase {
 	 * @var GlobalStoragesService|UserStoragesService|MockObject
 	 */
 	protected $service;
+	/**
+	 * @var BackendService|MockObject
+	 */
+	protected $backendService;
 
 	protected function setUp(): void {
 		MountConfig::$skipTest = true;
+
+		$this->backendService = $this->createMock(BackendService::class);
+		$this->backendService->method('getBackend')
+			->willReturnCallback(function ($identifier) {
+				if ($identifier === 'local') {
+					return $this->createMock(Local::class);
+				} else {
+					return $this->createMock(Backend::class);
+				}
+			});
 	}
 
 	protected function tearDown(): void {
diff --git a/apps/files_external/tests/Controller/UserStoragesControllerTest.php b/apps/files_external/tests/Controller/UserStoragesControllerTest.php
index c15ded48ea7..810b98d8775 100644
--- a/apps/files_external/tests/Controller/UserStoragesControllerTest.php
+++ b/apps/files_external/tests/Controller/UserStoragesControllerTest.php
@@ -56,7 +56,8 @@ class UserStoragesControllerTest extends StoragesControllerTest {
 			$this->createMock(LoggerInterface::class),
 			$session,
 			$this->createMock(IGroupManager::class),
-			$config
+			$config,
+			$this->backendService,
 		);
 	}