OZG-7473 given when then

Based on CR comment.

alfa-client/libs/admin/reporting-shared/src/lib/aggregation-mapping.service.spec.ts

@@ -108,7 +108,9 @@ describe('AggregationMappingService', () => {
     });
 
     it('should emit resource', () => {
-      expect(service.get()).toBeObservable(singleColdCompleted(stateResource));
+      const got$: Observable<StateResource<AggregationMappingResource>> = service.get();
+
+      expect(got$).toBeObservable(singleColdCompleted(stateResource));
     });
   });
 
@@ -126,7 +128,9 @@ describe('AggregationMappingService', () => {
     });
 
     it('should emit saved state resource', () => {
-      expect(service.save(aggregationMapping)).toBeObservable(singleColdCompleted(stateResource));
+      const saved$: Observable<StateResource<AggregationMappingResource>> = service.save(aggregationMapping);
+
+      expect(saved$).toBeObservable(singleColdCompleted(stateResource));
     });
   });
 });