diff --git a/apps/files_sharing/tests/CacheTest.php b/apps/files_sharing/tests/CacheTest.php
index a3c62db96b7..e8c63e6fc12 100644
--- a/apps/files_sharing/tests/CacheTest.php
+++ b/apps/files_sharing/tests/CacheTest.php
@@ -34,8 +34,6 @@ class CacheTest extends TestCase {
 	protected Cache $sharedCache;
 	protected Storage $ownerStorage;
 	protected Storage $sharedStorage;
-	/** @var \OCP\Share\IManager $shareManager */
-	protected $shareManager;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/files_sharing/tests/Controller/ShareControllerTest.php b/apps/files_sharing/tests/Controller/ShareControllerTest.php
index 2d73ea2da46..8bec64ef421 100644
--- a/apps/files_sharing/tests/Controller/ShareControllerTest.php
+++ b/apps/files_sharing/tests/Controller/ShareControllerTest.php
@@ -50,12 +50,14 @@ use OCP\Share\IAttributes;
 use OCP\Share\IPublicShareTemplateFactory;
 use OCP\Share\IShare;
 use PHPUnit\Framework\MockObject\MockObject;
+use Test\Traits\UserTrait;
 
 /**
  * @package OCA\Files_Sharing\Controllers
  */
 #[\PHPUnit\Framework\Attributes\Group(name: 'DB')]
 class ShareControllerTest extends \Test\TestCase {
+	use UserTrait;
 
 	private string $user;
 	private string $oldUser;
@@ -150,7 +152,7 @@ class ShareControllerTest extends \Test\TestCase {
 		// Create a dummy user
 		$this->user = Server::get(ISecureRandom::class)->generate(12, ISecureRandom::CHAR_LOWER);
 
-		Server::get(IUserManager::class)->createUser($this->user, $this->user);
+		$this->createUser($this->user, $this->user);
 		\OC_Util::tearDownFS();
 		$this->loginAsUser($this->user);
 	}
diff --git a/apps/files_sharing/tests/DeleteOrphanedSharesJobTest.php b/apps/files_sharing/tests/DeleteOrphanedSharesJobTest.php
index 5a434191132..03fc302b9a5 100644
--- a/apps/files_sharing/tests/DeleteOrphanedSharesJobTest.php
+++ b/apps/files_sharing/tests/DeleteOrphanedSharesJobTest.php
@@ -17,6 +17,7 @@ use OCP\IDBConnection;
 use OCP\IUserManager;
 use OCP\Server;
 use OCP\Share\IShare;
+use Test\Traits\UserTrait;
 
 /**
  * Class DeleteOrphanedSharesJobTest
@@ -26,6 +27,8 @@ use OCP\Share\IShare;
  */
 #[\PHPUnit\Framework\Attributes\Group(name: 'DB')]
 class DeleteOrphanedSharesJobTest extends \Test\TestCase {
+	use UserTrait;
+
 	/**
 	 * @var bool
 	 */
@@ -76,9 +79,8 @@ class DeleteOrphanedSharesJobTest extends \Test\TestCase {
 		$this->user1 = $this->getUniqueID('user1_');
 		$this->user2 = $this->getUniqueID('user2_');
 
-		$userManager = Server::get(IUserManager::class);
-		$userManager->createUser($this->user1, 'pass');
-		$userManager->createUser($this->user2, 'pass');
+		$this->createUser($this->user1, 'pass');
+		$this->createUser($this->user2, 'pass');
 
 		\OC::registerShareHooks(Server::get(SystemConfig::class));
 
diff --git a/apps/files_sharing/tests/ExpireSharesJobTest.php b/apps/files_sharing/tests/ExpireSharesJobTest.php
index 22d2487005c..667c781ad82 100644
--- a/apps/files_sharing/tests/ExpireSharesJobTest.php
+++ b/apps/files_sharing/tests/ExpireSharesJobTest.php
@@ -15,11 +15,11 @@ use OCP\Constants;
 use OCP\Files\IRootFolder;
 use OCP\IDBConnection;
 use OCP\IUser;
-use OCP\IUserManager;
 use OCP\Server;
 use OCP\Share\IManager;
 use OCP\Share\IShare;
 use PHPUnit\Framework\Attributes\DataProvider;
+use Test\Traits\UserTrait;
 
 /**
  * Class ExpireSharesJobTest
@@ -29,6 +29,7 @@ use PHPUnit\Framework\Attributes\DataProvider;
  */
 #[\PHPUnit\Framework\Attributes\Group(name: 'DB')]
 class ExpireSharesJobTest extends \Test\TestCase {
+	use UserTrait;
 
 	private ExpireSharesJob $job;
 
@@ -51,9 +52,8 @@ class ExpireSharesJobTest extends \Test\TestCase {
 		$user1 = $this->getUniqueID('user1_');
 		$user2 = $this->getUniqueID('user2_');
 
-		$userManager = Server::get(IUserManager::class);
-		$this->user1 = $userManager->createUser($user1, 'longrandompassword');
-		$this->user2 = $userManager->createUser($user2, 'longrandompassword');
+		$this->user1 = $this->createUser($user1, 'longrandompassword');
+		$this->user2 = $this->createUser($user2, 'longrandompassword');
 
 		\OC::registerShareHooks(Server::get(SystemConfig::class));
 
diff --git a/apps/files_sharing/tests/External/ManagerTest.php b/apps/files_sharing/tests/External/ManagerTest.php
index 44efcb34126..804f415f522 100644
--- a/apps/files_sharing/tests/External/ManagerTest.php
+++ b/apps/files_sharing/tests/External/ManagerTest.php
@@ -70,7 +70,7 @@ class ManagerTest extends TestCase {
 	protected ICloudFederationFactory&MockObject $cloudFederationFactory;
 	protected IGroupManager&MockObject $groupManager;
 	protected IUserManager&MockObject $userManager;
-	protected ISetupManager&MockObject $setupManager;
+	protected ISetupManager&MockObject $setupManagerEncTrait;
 	protected ICertificateManager&MockObject $certificateManager;
 	private ExternalShareMapper $externalShareMapper;
 	private IConfig $config;
@@ -88,7 +88,7 @@ class ManagerTest extends TestCase {
 		$this->groupManager = $this->createMock(IGroupManager::class);
 		$this->userManager = $this->createMock(IUserManager::class);
 		$this->eventDispatcher = $this->createMock(IEventDispatcher::class);
-		$this->setupManager = $this->createMock(ISetupManager::class);
+		$this->setupManagerEncTrait = $this->createMock(ISetupManager::class);
 		$this->rootFolder = $this->createMock(IRootFolder::class);
 		$this->rootFolder->method('getUserFolder')
 			->willReturnCallback(function (string $userId): Folder {
@@ -170,7 +170,7 @@ class ManagerTest extends TestCase {
 					$this->eventDispatcher,
 					$this->logger,
 					$this->rootFolder,
-					$this->setupManager,
+					$this->setupManagerEncTrait,
 					$this->certificateManager,
 					$this->externalShareMapper,
 					$this->config,
diff --git a/apps/files_sharing/tests/LockingTest.php b/apps/files_sharing/tests/LockingTest.php
index 9ec54c2d47f..b2bd0dae9f2 100644
--- a/apps/files_sharing/tests/LockingTest.php
+++ b/apps/files_sharing/tests/LockingTest.php
@@ -11,11 +11,10 @@ namespace OCA\Files_Sharing\Tests;
 use OC\Files\Filesystem;
 use OC\Files\View;
 use OCP\Constants;
-use OCP\IUserManager;
 use OCP\Lock\ILockingProvider;
 use OCP\Lock\LockedException;
-use OCP\Server;
 use OCP\Share\IShare;
+use Test\Traits\UserTrait;
 
 /**
  * Class LockingTest
@@ -25,10 +24,7 @@ use OCP\Share\IShare;
  */
 #[\PHPUnit\Framework\Attributes\Group(name: 'DB')]
 class LockingTest extends TestCase {
-	/**
-	 * @var \Test\Util\User\Dummy
-	 */
-	private $userBackend;
+	use UserTrait;
 
 	private $ownerUid;
 	private $recipientUid;
@@ -36,13 +32,10 @@ class LockingTest extends TestCase {
 	protected function setUp(): void {
 		parent::setUp();
 
-		$this->userBackend = new \Test\Util\User\Dummy();
-		Server::get(IUserManager::class)->registerBackend($this->userBackend);
-
 		$this->ownerUid = $this->getUniqueID('owner_');
 		$this->recipientUid = $this->getUniqueID('recipient_');
-		$this->userBackend->createUser($this->ownerUid, '');
-		$this->userBackend->createUser($this->recipientUid, '');
+		$this->createUser($this->ownerUid, '');
+		$this->createUser($this->recipientUid, '');
 
 		$this->loginAsUser($this->ownerUid);
 		Filesystem::mkdir('/foo');
@@ -61,11 +54,6 @@ class LockingTest extends TestCase {
 		$this->assertTrue(Filesystem::file_exists('bar.txt'));
 	}
 
-	protected function tearDown(): void {
-		Server::get(IUserManager::class)->removeBackend($this->userBackend);
-		parent::tearDown();
-	}
-
 	public function testLockAsRecipient(): void {
 		$this->expectException(LockedException::class);
 
diff --git a/apps/files_sharing/tests/TestCase.php b/apps/files_sharing/tests/TestCase.php
index e9732b5ff02..80c0a3573b6 100644
--- a/apps/files_sharing/tests/TestCase.php
+++ b/apps/files_sharing/tests/TestCase.php
@@ -8,25 +8,26 @@
 
 namespace OCA\Files_Sharing\Tests;
 
-use OC\Files\Cache\Storage;
-use OC\Files\Filesystem;
 use OC\Files\View;
-use OC\Group\Database;
 use OC\SystemConfig;
 use OC\User\DisplayNameCache;
+use OC\User\Session;
 use OCA\Files_Sharing\AppInfo\Application;
 use OCA\Files_Sharing\External\MountProvider as ExternalMountProvider;
 use OCA\Files_Sharing\Listener\SharesUpdatedListener;
 use OCA\Files_Sharing\MountProvider;
 use OCP\Files\Config\IMountProviderCollection;
 use OCP\Files\IRootFolder;
+use OCP\Files\ISetupManager;
 use OCP\IDBConnection;
-use OCP\IGroupManager;
 use OCP\IUserManager;
 use OCP\IUserSession;
 use OCP\Server;
+use OCP\Share\IManager;
 use OCP\Share\IShare;
+use Test\Traits\GroupTrait;
 use Test\Traits\MountProviderTrait;
+use Test\Traits\UserTrait;
 
 /**
  * Base class for sharing tests.
@@ -34,6 +35,8 @@ use Test\Traits\MountProviderTrait;
 #[\PHPUnit\Framework\Attributes\Group(name: 'DB')]
 abstract class TestCase extends \Test\TestCase {
 	use MountProviderTrait;
+	use UserTrait;
+	use GroupTrait;
 
 	public const TEST_FILES_SHARING_API_USER1 = 'test-share-user1';
 	public const TEST_FILES_SHARING_API_USER2 = 'test-share-user2';
@@ -55,13 +58,21 @@ abstract class TestCase extends \Test\TestCase {
 	public $folder;
 	public $subfolder;
 
-	/** @var \OCP\Share\IManager */
+	/** @var IManager */
 	protected $shareManager;
 	/** @var IRootFolder */
 	protected $rootFolder;
+	protected Session $userSession;
+	protected ISetupManager $setupManager;
 
-	public static function setUpBeforeClass(): void {
-		parent::setUpBeforeClass();
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->shareManager = Server::get(IManager::class);
+		$this->rootFolder = Server::get(IRootFolder::class);
+
+		$this->setupManager = Server::get(ISetupManager::class);
+		$this->userSession = Server::get(IUserSession::class);
 
 		$app = new Application();
 		$app->registerMountProviders(
@@ -70,54 +81,43 @@ abstract class TestCase extends \Test\TestCase {
 			Server::get(ExternalMountProvider::class),
 		);
 
-		// reset backend
-		Server::get(IUserManager::class)->clearBackends();
-		Server::get(IGroupManager::class)->clearBackends();
-
 		// clear share hooks
 		\OC_Hook::clear('OCP\\Share');
 		\OC::registerShareHooks(Server::get(SystemConfig::class));
 
-		// create users
-		$backend = new \Test\Util\User\Dummy();
-		Server::get(IUserManager::class)->registerBackend($backend);
-		$backend->createUser(self::TEST_FILES_SHARING_API_USER1, self::TEST_FILES_SHARING_API_USER1);
-		$backend->createUser(self::TEST_FILES_SHARING_API_USER2, self::TEST_FILES_SHARING_API_USER2);
-		$backend->createUser(self::TEST_FILES_SHARING_API_USER3, self::TEST_FILES_SHARING_API_USER3);
-		$backend->createUser(self::TEST_FILES_SHARING_API_USER4, self::TEST_FILES_SHARING_API_USER4);
-
-		// create group
-		$groupBackend = new \Test\Util\Group\Dummy();
-		$groupBackend->createGroup(self::TEST_FILES_SHARING_API_GROUP1);
-		$groupBackend->createGroup('group');
-		$groupBackend->createGroup('group1');
-		$groupBackend->createGroup('group2');
-		$groupBackend->createGroup('group3');
-		$groupBackend->addToGroup(self::TEST_FILES_SHARING_API_USER1, 'group');
-		$groupBackend->addToGroup(self::TEST_FILES_SHARING_API_USER2, 'group');
-		$groupBackend->addToGroup(self::TEST_FILES_SHARING_API_USER3, 'group');
-		$groupBackend->addToGroup(self::TEST_FILES_SHARING_API_USER2, 'group1');
-		$groupBackend->addToGroup(self::TEST_FILES_SHARING_API_USER3, 'group2');
-		$groupBackend->addToGroup(self::TEST_FILES_SHARING_API_USER4, 'group3');
-		$groupBackend->addToGroup(self::TEST_FILES_SHARING_API_USER2, self::TEST_FILES_SHARING_API_GROUP1);
-		Server::get(IGroupManager::class)->addBackend($groupBackend);
-
 		Server::get(SharesUpdatedListener::class)->setCutOffMarkTime(-1);
-	}
 
-	protected function setUp(): void {
-		parent::setUp();
 		Server::get(DisplayNameCache::class)->clear();
 
+		$this->createUser(self::TEST_FILES_SHARING_API_USER1, self::TEST_FILES_SHARING_API_USER1);
+		$this->createUser(self::TEST_FILES_SHARING_API_USER2, self::TEST_FILES_SHARING_API_USER2);
+		$this->createUser(self::TEST_FILES_SHARING_API_USER3, self::TEST_FILES_SHARING_API_USER3);
+		$this->createUser(self::TEST_FILES_SHARING_API_USER4, self::TEST_FILES_SHARING_API_USER4);
+
+		$this->createGroup(self::TEST_FILES_SHARING_API_GROUP1, [
+			self::TEST_FILES_SHARING_API_USER2,
+		]);
+		$this->createGroup('group', [
+			self::TEST_FILES_SHARING_API_USER1,
+			self::TEST_FILES_SHARING_API_USER2,
+			self::TEST_FILES_SHARING_API_USER3,
+		]);
+		$this->createGroup('group1', [
+			self::TEST_FILES_SHARING_API_USER2,
+		]);
+		$this->createGroup('group2', [
+			self::TEST_FILES_SHARING_API_USER3,
+		]);
+		$this->createGroup('group3', [
+			self::TEST_FILES_SHARING_API_USER4,
+		]);
+
 		//login as user1
 		$this->loginHelper(self::TEST_FILES_SHARING_API_USER1);
 
 		$this->data = 'foobar';
 		$this->view = new View('/' . self::TEST_FILES_SHARING_API_USER1 . '/files');
 		$this->view2 = new View('/' . self::TEST_FILES_SHARING_API_USER2 . '/files');
-
-		$this->shareManager = Server::get(\OCP\Share\IManager::class);
-		$this->rootFolder = Server::get(IRootFolder::class);
 	}
 
 	protected function tearDown(): void {
@@ -133,73 +133,18 @@ abstract class TestCase extends \Test\TestCase {
 		$qb->delete('filecache')->runAcrossAllShards();
 		$qb->executeStatement();
 
+		$this->userSession->setUser(null);
+		$this->setupManager->tearDown();
+
 		parent::tearDown();
 	}
 
-	public static function tearDownAfterClass(): void {
-		// cleanup users
-		$user = Server::get(IUserManager::class)->get(self::TEST_FILES_SHARING_API_USER1);
-		if ($user !== null) {
-			$user->delete();
-		}
-		$user = Server::get(IUserManager::class)->get(self::TEST_FILES_SHARING_API_USER2);
-		if ($user !== null) {
-			$user->delete();
-		}
-		$user = Server::get(IUserManager::class)->get(self::TEST_FILES_SHARING_API_USER3);
-		if ($user !== null) {
-			$user->delete();
-		}
+	protected function loginHelper(string $uid) {
+		$this->setupManager->tearDown();
+		$user = Server::get(IUserManager::class)->get($uid);
+		$this->userSession->completeLogin($user, ['loginName' => $uid, 'password' => $uid], false);
 
-		// delete group
-		$group = Server::get(IGroupManager::class)->get(self::TEST_FILES_SHARING_API_GROUP1);
-		if ($group) {
-			$group->delete();
-		}
-
-		\OC_Util::tearDownFS();
-		\OC_User::setUserId('');
-		Filesystem::tearDown();
-
-		// reset backend
-		Server::get(IUserManager::class)->clearBackends();
-		Server::get(IUserManager::class)->registerBackend(new \OC\User\Database());
-		Server::get(IGroupManager::class)->clearBackends();
-		Server::get(IGroupManager::class)->addBackend(new Database());
-
-		parent::tearDownAfterClass();
-	}
-
-	/**
-	 * @param string $user
-	 * @param bool $create
-	 * @param bool $password
-	 */
-	protected function loginHelper($user, $create = false, $password = false) {
-		if ($password === false) {
-			$password = $user;
-		}
-
-		if ($create) {
-			$userManager = Server::get(IUserManager::class);
-			$groupManager = Server::get(IGroupManager::class);
-
-			$userObject = $userManager->createUser($user, $password);
-			$group = $groupManager->createGroup('group');
-
-			if ($group && $userObject) {
-				$group->addUser($userObject);
-			}
-		}
-
-		\OC_Util::tearDownFS();
-		Storage::getGlobalCache()->clearCache();
-		Server::get(IUserSession::class)->setUser(null);
-		Filesystem::tearDown();
-		Server::get(IUserSession::class)->login($user, $password);
-		\OC::$server->getUserFolder($user);
-
-		\OC_Util::setupFS($user);
+		$this->rootFolder->newFolder('/' . $uid . '/files');
 	}
 
 	/**