diff --git a/backend/src/test/java/org/raddatz/familienarchiv/document/ThumbnailAsyncRunnerTest.java b/backend/src/test/java/org/raddatz/familienarchiv/document/ThumbnailAsyncRunnerTest.java
index c281136e..4da4d2d6 100644
--- a/backend/src/test/java/org/raddatz/familienarchiv/document/ThumbnailAsyncRunnerTest.java
+++ b/backend/src/test/java/org/raddatz/familienarchiv/document/ThumbnailAsyncRunnerTest.java
@@ -17,22 +17,22 @@ import static org.mockito.Mockito.*;
 
 class ThumbnailAsyncRunnerTest {
 
-    private DocumentService documentService;
+    private DocumentRepository documentRepository;
     private ThumbnailService thumbnailService;
     private ThumbnailAsyncRunner runner;
 
     @BeforeEach
     void setUp() {
-        documentService = mock(DocumentService.class);
+        documentRepository = mock(DocumentRepository.class);
         thumbnailService = mock(ThumbnailService.class);
-        runner = new ThumbnailAsyncRunner(documentService, thumbnailService);
+        runner = new ThumbnailAsyncRunner(documentRepository, thumbnailService);
     }
 
     @Test
     void dispatchAfterCommit_whenNoTransaction_dispatchesImmediately() {
         UUID id = UUID.randomUUID();
         Document doc = Document.builder().id(id).originalFilename("f.pdf").title("t").build();
-        when(documentService.findById(id)).thenReturn(Optional.of(doc));
+        when(documentRepository.findById(id)).thenReturn(Optional.of(doc));
 
         runner.dispatchAfterCommit(id);
 
@@ -43,7 +43,7 @@ class ThumbnailAsyncRunnerTest {
     void dispatchAfterCommit_whenTransactionActive_registersAfterCommitSynchronization() {
         UUID id = UUID.randomUUID();
         Document doc = Document.builder().id(id).originalFilename("f.pdf").title("t").build();
-        when(documentService.findById(id)).thenReturn(Optional.of(doc));
+        when(documentRepository.findById(id)).thenReturn(Optional.of(doc));
 
         TransactionSynchronizationManager.initSynchronization();
         try {
@@ -68,7 +68,7 @@ class ThumbnailAsyncRunnerTest {
     void dispatchAfterCommit_whenRollback_doesNotDispatch() {
         UUID id = UUID.randomUUID();
         Document doc = Document.builder().id(id).originalFilename("f.pdf").title("t").build();
-        when(documentService.findById(id)).thenReturn(Optional.of(doc));
+        when(documentRepository.findById(id)).thenReturn(Optional.of(doc));
 
         TransactionSynchronizationManager.initSynchronization();
         try {
@@ -87,7 +87,7 @@ class ThumbnailAsyncRunnerTest {
     @Test
     void generateAsync_skipsWhenDocumentMissing() {
         UUID id = UUID.randomUUID();
-        when(documentService.findById(id)).thenReturn(Optional.empty());
+        when(documentRepository.findById(id)).thenReturn(Optional.empty());
 
         runner.generateAsync(id);
 
@@ -98,7 +98,7 @@ class ThumbnailAsyncRunnerTest {
     void generateAsync_timesOutWhenGenerateExceedsLimit() throws Exception {
         UUID id = UUID.randomUUID();
         Document doc = Document.builder().id(id).originalFilename("f.pdf").title("t").build();
-        when(documentService.findById(id)).thenReturn(Optional.of(doc));
+        when(documentRepository.findById(id)).thenReturn(Optional.of(doc));
         // generate sleeps longer than the timeout — simulates a hung PDFBox render
         when(thumbnailService.generate(doc)).thenAnswer(inv -> {
             Thread.sleep(5_000);