[stable33] test: Reset the correct mount provider collection instance and add back the files_sharing mount provider

lib/private/Server.php

@@ -803,6 +803,8 @@ public function __construct($webRoot, \OC\Config $config) {
 			return $manager;
 		});
 
+		$this->registerAlias(MountProviderCollection::class, IMountProviderCollection::class);
+
 		$this->registerService(IBus::class, function (ContainerInterface $c) {
 			$busClass = $c->get(\OCP\IConfig::class)->getSystemValueString('commandbus');
 			if ($busClass) {

tests/lib/TestCase.php

@@ -23,6 +23,7 @@
 use OC\Files\View;
 use OC\Installer;
 use OC\Updater;
+use OCA\Files_Sharing\MountProvider;
 use OCP\Command\IBus;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\Files\IRootFolder;
@@ -315,13 +316,13 @@ public static function tearDownAfterClass(): void {
 		$setupManager = Server::get(SetupManager::class);
 		$setupManager->tearDown();
 
-		/** @var MountProviderCollection $mountProviderCollection */
 		$mountProviderCollection = Server::get(MountProviderCollection::class);
 		$mountProviderCollection->clearProviders();
 
 		/** @var IConfig $config */
 		$config = Server::get(IConfig::class);
 		$mountProviderCollection->registerProvider(new CacheMountProvider($config));
+		$mountProviderCollection->registerProvider(Server::get(MountProvider::class));
 		$mountProviderCollection->registerHomeProvider(new LocalHomeMountProvider());
 		$objectStoreConfig = Server::get(PrimaryObjectStoreConfig::class);
 		$mountProviderCollection->registerRootProvider(new RootMountProvider($objectStoreConfig, $config));

tests/lib/TestCaseTest.php

@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test;
+
+use OCP\Constants;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\Server;
+use OCP\Share\IManager;
+use OCP\Share\IShare;
+use Test\Traits\UserTrait;
+
+#[\PHPUnit\Framework\Attributes\Group('DB')]
+class TestCaseTest extends TestCase {
+	use UserTrait;
+
+	// This test cannot fail if this suite is run standalone.
+	// It will only fail if the mount provider collection wasn't correctly reset after a different test suite was executed before this one.
+	public function testMountProviderCollectionReset(): void {
+		$owner = $this->createUser('owner', 'password');
+		$receiver = $this->createUser('receiver', 'password');
+
+		$ownerUserFolder = Server::get(IRootFolder::class)->getUserFolder($owner->getUID());
+		$ownerNode = $ownerUserFolder->newFolder('foo');
+		$this->assertInstanceOf(Folder::class, $ownerNode);
+
+		$manager = Server::get(IManager::class);
+		$manager->createShare(
+			$manager->newShare()
+				->setShareType(IShare::TYPE_USER)
+				->setShareOwner($owner->getUID())
+				->setSharedBy($owner->getUID())
+				->setSharedWith($receiver->getUID())
+				->setNode($ownerNode)
+				->setPermissions(Constants::PERMISSION_ALL)
+		);
+
+		$receiverUserFolder = Server::get(IRootFolder::class)->getUserFolder($receiver->getUID());
+		$receiverNode = $receiverUserFolder->get($ownerNode->getName());
+		$this->assertInstanceOf(Folder::class, $receiverNode);
+	}
+}