[DSC-2194] fix tests failing because of multiple spy registrations

(cherry picked from commit 9ba9b94120e09a52d34644c204e86c5c5ec36e3f)
(cherry picked from commit 440820d)

Author: Andrea Barbasso

src/app/lucky-search/search/lucky-search.component.spec.ts

@@ -203,7 +203,7 @@ describe('LuckySearchComponent', () => {
       spyOn((component as any), 'loadBitstreamsAndRedirectIfNeeded').and.returnValue(observableOf([bitstream]));
       spyOn((component as any), 'hasBitstreamFilters').and.returnValue(true);
       spyOn(component, 'redirect');
-      routerStub.parseUrl.and.returnValue(bitstreamSearchTree);
+      routerStub.parseUrl.and.returnValue(bitstreamSearchTree).and.callThrough();
 
       component.resultsRD$.next(data);