diff --git a/tests/lib/Preview/PreviewMapperTest.php b/tests/lib/Preview/PreviewMapperTest.php
index 5ed1c6f8451..0a7fc6a5d78 100644
--- a/tests/lib/Preview/PreviewMapperTest.php
+++ b/tests/lib/Preview/PreviewMapperTest.php
@@ -24,6 +24,7 @@ class PreviewMapperTest extends TestCase {
 	private IGenerator $snowflake;
 
 	public function setUp(): void {
+		parent::setUp();
 		$this->previewMapper = Server::get(PreviewMapper::class);
 		$this->connection = Server::get(IDBConnection::class);
 		$this->snowflake = Server::get(IGenerator::class);
@@ -38,6 +39,11 @@ class PreviewMapperTest extends TestCase {
 		$qb->delete('previews')->executeStatement();
 	}
 
+	public function tearDown(): void {
+		$this->previewMapper->deleteAll();
+		parent::tearDown();
+	}
+
 	public function testGetAvailablePreviews(): void {
 		// Empty
 		$this->assertEquals([], $this->previewMapper->getAvailablePreviews([]));
diff --git a/tests/lib/Preview/PreviewServiceTest.php b/tests/lib/Preview/PreviewServiceTest.php
index a09b07380aa..6106dbb7a04 100644
--- a/tests/lib/Preview/PreviewServiceTest.php
+++ b/tests/lib/Preview/PreviewServiceTest.php
@@ -25,6 +25,7 @@ class PreviewServiceTest extends TestCase {
 	private IGenerator $snowflakeGenerator;
 
 	protected function setUp(): void {
+		parent::setUp();
 		$this->previewService = Server::get(PreviewService::class);
 		$this->previewMapper = Server::get(PreviewMapper::class);
 		$this->snowflakeGenerator = Server::get(IGenerator::class);
@@ -33,6 +34,7 @@ class PreviewServiceTest extends TestCase {
 
 	public function tearDown(): void {
 		$this->previewService->deleteAll();
+		parent::tearDown();
 	}
 
 	public function testGetAvailableFileIds(): void {