[SI-1867] fix unit test Signed-off-by: Peter Buschmann <peter.buschmann@pta.de>

diff --git a/projects/grid-failure-information-app/src/app/shared/async-services/http/httpResponseHandler.service.spec.ts b/projects/grid-failure-information-app/src/app/shared/async-services/http/httpResponseHandler.service.spec.ts
index 242e1b3..481d611 100644
--- a/projects/grid-failure-information-app/src/app/shared/async-services/http/httpResponseHandler.service.spec.ts
+++ b/projects/grid-failure-information-app/src/app/shared/async-services/http/httpResponseHandler.service.spec.ts

@@ -31,6 +31,7 @@
     };
     notificationsService = {
       error() {},
+      warn() {},
       info() {},
     };
     configService = {
@@ -162,9 +163,9 @@
     expect(spy2).toHaveBeenCalled();
   });
 
-  it('should show an error notification when calling handleRefExists', () => {
+  it('should show an warning notification when calling handleRefExists', () => {
     const spy = spyOn(translateService, 'instant');
-    const spy2 = spyOn(component as any, 'showNotificationError');
+    const spy2 = spyOn(component as any, 'showNotificationWarning');
 
     (component as any).handleRefExists();
     expect(spy).toHaveBeenCalledWith('ServerError409');