Add tests for cases where subscription is made after http request

Author: mpalourdio

test/components/spinner/spinner.component.spec.ts

@@ -169,4 +169,18 @@ describe('SpinnerComponent', () => {
         expect(() => fixture.detectChanges())
             .toThrow(new Error('`filteredUrlPatterns` must be an array.'));
     });
+
+    it('should show the spinner even if the component is created after the http request is performed', inject(
+        [PendingInterceptorService, HttpClient, HttpTestingController],
+        (service: PendingInterceptorService, http: HttpClient, httpMock: HttpTestingController) => {
+            http.get('/fake').subscribe();
+
+            const newFixture = TestBed.createComponent(SpinnerComponent);
+            const newComponent = newFixture.componentInstance;
+            expect(newComponent.isSpinnerVisible).toBeTruthy();
+            httpMock.expectOne('/fake').flush({});
+            expect(newComponent.isSpinnerVisible).toBeFalsy();
+            httpMock.verify();
+        }
+    ));
 });

test/services/pending-interceptor.service.spec.ts

@@ -76,6 +76,22 @@ describe('PendingInterceptorService', () => {
             })
     ));
 
+    it('should correctly notify the pendingRequestsStatus observable, even if subscribed after', async(
+        inject(
+            [PendingInterceptorService, HttpClient, HttpTestingController],
+            (service: PendingInterceptorService, http: HttpClient, httpMock: HttpTestingController) => {
+                http.get('/fake').subscribe();
+                httpMock.expectOne('/fake');
+
+                const pendingRequestsStatus = service.pendingRequestsStatus;
+                pendingRequestsStatus
+                    .subscribe(
+                        (next: boolean) => expect(next).toBeTruthy(),
+                        (error: HttpErrorResponse) => expect(1).toBe(2)
+                    );
+            })
+    ));
+
     it('should fail correctly',
         inject(
             [PendingInterceptorService, HttpClient, HttpTestingController],