diff --git a/vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java b/vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java
index 8a35cbb9b9758cf5dc29b5bd747bd47335773a98..5d554563e14b2b91a5942868fca28811cbc8bf4d 100644
--- a/vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java
+++ b/vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java
@@ -408,15 +408,19 @@ class AntragraumITCase {
 			vorgangAttachedItemDifferentAttachment = mongoOperations.save(
 					createPostfachNachrichtVorgangAttachedItem(savedVorgang.getId()),
 					VorgangAttachedItem.COLLECTION_NAME);
-		}
+		}´
 
-		@Test
-		void shouldSendContent() {
+		@BeforeEach
+		void mockObserver() {
 			when(responseObserver.isReady()).thenReturn(true);
 			doAnswer(invocation -> {
 				((Runnable) invocation.getArgument(0)).run();
 				return null;
 			}).when(responseObserver).setOnReadyHandler(any());
+		}
+
+		@Test
+		void shouldSendContent() {
 			when(verifier.verify(any())).thenReturn(Collections.emptyList());
 			when(decrypter.decryptTrustLevel(any())).thenReturn(TrustLevel.LEVEL_3.getValue());
 			when(decrypter.decryptPostfachId(any()))
@@ -448,7 +452,7 @@ class AntragraumITCase {
 
 			grpcService.getAttachmentContent(request, responseObserver);
 
-			verify(responseObserver, never()).setOnReadyHandler(any());
+			verify(responseObserver, never()).onNext(any());
 
 		}
 
@@ -465,7 +469,7 @@ class AntragraumITCase {
 
 			grpcService.getAttachmentContent(request, responseObserver);
 
-			verify(responseObserver, never()).setOnReadyHandler(any());
+			verify(responseObserver, never()).onNext(any());
 		}
 
 		@Test
@@ -482,7 +486,7 @@ class AntragraumITCase {
 
 			grpcService.getAttachmentContent(request, responseObserver);
 
-			verify(responseObserver, never()).setOnReadyHandler(any());
+			verify(responseObserver, never()).onNext(any());
 		}
 
 		@Test
@@ -499,7 +503,7 @@ class AntragraumITCase {
 
 			grpcService.getAttachmentContent(request, responseObserver);
 
-			verify(responseObserver, never()).setOnReadyHandler(any());
+			verify(responseObserver, never()).onNext(any());
 		}
 	}