diff --git a/vorgang-manager-server/src/test/java/de/ozgcloud/vorgang/collaboration/CollaborationITCase.java b/vorgang-manager-server/src/test/java/de/ozgcloud/vorgang/collaboration/CollaborationITCase.java
index 780422562068fdc5a704075b80056084a4d22624..bc044d9c64916d0b4b61fc4ea071c0a1b08b4920 100644
--- a/vorgang-manager-server/src/test/java/de/ozgcloud/vorgang/collaboration/CollaborationITCase.java
+++ b/vorgang-manager-server/src/test/java/de/ozgcloud/vorgang/collaboration/CollaborationITCase.java
@@ -33,6 +33,7 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.UUID;
 import java.util.concurrent.TimeUnit;
 
@@ -54,6 +55,7 @@ import org.springframework.data.mongodb.core.query.Criteria;
 import org.springframework.data.mongodb.core.query.Query;
 import org.springframework.data.mongodb.gridfs.GridFsTemplate;
 import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.util.ReflectionTestUtils;
 
 import com.google.protobuf.ByteString;
 import com.thedeanda.lorem.LoremIpsum;
@@ -64,6 +66,7 @@ import de.ozgcloud.apilib.user.OzgCloudUserProfile;
 import de.ozgcloud.apilib.user.OzgCloudUserProfileService;
 import de.ozgcloud.collaboration.CollaborationManagerConfiguration;
 import de.ozgcloud.collaboration.CollaborationRequest;
+import de.ozgcloud.collaboration.CollaborationService;
 import de.ozgcloud.collaboration.CollaborationServiceGrpc.CollaborationServiceBlockingStub;
 import de.ozgcloud.collaboration.GrpcGetFileContentRequest;
 import de.ozgcloud.collaboration.request.CollaborationRequestId;
@@ -107,7 +110,7 @@ import net.devh.boot.grpc.client.inject.GrpcClient;
 })
 @DataITCase
 @WithMockCustomUser
-@DirtiesContext
+@DirtiesContext(classMode = DirtiesContext.ClassMode.BEFORE_CLASS)
 class CollaborationITCase {
 
 	private static final String FIELD_COLLABORATION_VORGANG_ID = "collaborationVorgangId";
@@ -117,6 +120,8 @@ class CollaborationITCase {
 
 	@Autowired
 	private CommandService commandService;
+	@Autowired
+	private CollaborationService collaborationService;
 
 	@Autowired
 	private MongoOperations mongoOperations;
@@ -286,45 +291,59 @@ class CollaborationITCase {
 
 		private static final int COLLABORATION_LEVEL = 4;
 
-		@Captor
-		private ArgumentCaptor<PostfachNachricht> postfachNachrichtCaptor;
+		@Nested
+		class TestSuccessfully {
+			@Captor
+			private ArgumentCaptor<PostfachNachricht> postfachNachrichtCaptor;
+
+			@BeforeEach
+			void init() {
+				when(ozgCloudUserProfile.getId()).thenReturn(OzgCloudUserId.from(CommandTestFactory.CREATED_BY));
+				when(collaborationOzgCloudUserProfileService.getById(any())).thenReturn(ozgCloudUserProfile);
+			}
 
-		@BeforeEach
-		void init() {
-			when(ozgCloudUserProfile.getId()).thenReturn(OzgCloudUserId.from(CommandTestFactory.CREATED_BY));
-			when(collaborationOzgCloudUserProfileService.getById(any())).thenReturn(ozgCloudUserProfile);
-		}
+			@Test
+			void shouldCreateCollaborationRequest() {
+				var command = commandService.createCommand(buildCreateCollaborationVorgangCommand(vorgangId, COLLABORATION_LEVEL));
 
-		@Test
-		void shouldCreateCollaborationRequest() {
-			var command = commandService.createCommand(buildCreateCollaborationVorgangCommand(vorgangId, COLLABORATION_LEVEL));
+				waitUntilCommandHasStatus(command.getId(), CommandStatus.FINISHED);
 
-			waitUntilCommandHasStatus(command.getId(), CommandStatus.FINISHED);
+				var collaborationRequests = loadCollaborationRequest(vorgangId);
+				assertThat(collaborationRequests).hasSize(1).first().extracting(VorgangAttachedItem::getItem, MAP)
+						.containsEntry(FIELD_COLLABORATION_VORGANG_ID, vorgangId);
+			}
 
-			var collaborationRequests = loadCollaborationRequest(vorgangId);
-			assertThat(collaborationRequests).hasSize(1).first().extracting(VorgangAttachedItem::getItem, MAP)
-					.containsEntry(FIELD_COLLABORATION_VORGANG_ID, vorgangId);
-		}
+			@Test
+			void shouldSendPostfachNachricht() {
+				var command = commandService.createCommand(buildCreateCollaborationVorgangCommand(vorgangId, COLLABORATION_LEVEL));
 
-		@Test
-		void shouldSendPostfachNachricht() {
-			var command = commandService.createCommand(buildCreateCollaborationVorgangCommand(vorgangId, COLLABORATION_LEVEL));
+				waitUntilCommandHasStatus(command.getId(), CommandStatus.FINISHED);
 
-			waitUntilCommandHasStatus(command.getId(), CommandStatus.FINISHED);
+				verify(postfachRemoteService).sendMessage(postfachNachrichtCaptor.capture());
+				assertThat(postfachNachrichtCaptor.getValue().getPostfachAddress()).extracting(PostfachAddress::getIdentifier)
+						.hasToString(MUK_POSTFACH_ID);
+			}
+
+			@Test
+			void shouldDeleteCollaborationRequest() {
+				doThrow(TechnicalException.class).when(postfachRemoteService).sendMessage(any());
+				var command = commandService.createCommand(buildCreateCollaborationVorgangCommand(vorgangId, COLLABORATION_LEVEL));
+
+				waitUntilCommandHasStatus(command.getId(), CommandStatus.ERROR);
 
-			verify(postfachRemoteService).sendMessage(postfachNachrichtCaptor.capture());
-			assertThat(postfachNachrichtCaptor.getValue().getPostfachAddress()).extracting(PostfachAddress::getIdentifier)
-					.hasToString(MUK_POSTFACH_ID);
+				assertThat(loadCollaborationRequest(vorgangId)).isEmpty();
+			}
 		}
 
 		@Test
-		void shouldDeleteCollaborationRequest() {
-			doThrow(TechnicalException.class).when(postfachRemoteService).sendMessage(any());
+		void shouldFailOnMissingFachstelle() {
+			ReflectionTestUtils.setField(collaborationService, "urlProvider", Optional.empty());
 			var command = commandService.createCommand(buildCreateCollaborationVorgangCommand(vorgangId, COLLABORATION_LEVEL));
 
 			waitUntilCommandHasStatus(command.getId(), CommandStatus.ERROR);
 
-			assertThat(loadCollaborationRequest(vorgangId)).isEmpty();
+			command = mongoOperations.findById(command.getId(), Command.class);
+			assertThat(command.getErrorMessage()).contains("Fachstelle not configured.");
 		}
 	}