I have the below http interceptor in my angular application and I would like to unit test the same using Jasmine. I googled some of them and tried but its not working as expected. Please find the below HttpInterceptorService.ts file code

```
export class HttpInterceptorService Implements HttpInterceptor {
 counter = 0;
 constructor(private loaderService: LoaderService) { }
 intercept(req: HttpRequest<any>, next: HttpHandler) {
  if (req.url !== '/getUsers') {
   this.counter ++;
  }
  this.loaderService.setStatus(true);
  return next.handle(req).pipe(
   finalize(() => {
    if (req.url !== 'getUsers') {
      this.counter --;
    }
    if (this.counter === 0) {
      this.loaderService.setStatus(false);
    }
   };
  );
 }
}

```

Below are the HttpInterceptor.service.spec.ts file code which I tried as of now. Im not sure how to test the particular method in it.

```
describe('HttpInterceptorService', () => {
  let httpService: HttpService;
  let httpMock: HttpTestingController;
  let interceptor: HttpInterceptorService;

  beforeEach(()=> {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [
       HttpService,
       {provide:HTTP_INTERCEPTOR, useClass: HttpInterceptorService, multi: true},
      ]
    });
    httpService = TestBed.get(HttpService);
    httpMock = TestBed.get(HttpTestingController);
    interceptor = TestBed.get(HttpInterceptorService);
  });

   it('should increment the counter for all api's expect getUsers', ()=> {
      httpService.get('getAdminList').subscribe(res => {
        expect(res).toBeTruthy();
        expect(interceptor.counter).toBeGreaterThan(0);
      });
   });

});

```

after checking the reference code I'm able to cover few lines of code with above changes. But I'm still not able to cover the finalize method. Request to kindly help.