diff --git a/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.spec.ts b/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.spec.ts
index 6bbbf71a52..efee968f4a 100644
--- a/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.spec.ts
+++ b/lib/core/src/lib/viewer/components/pdf-viewer/pdf-viewer.component.spec.ts
@@ -381,14 +381,16 @@ fdescribe('Test PdfViewer - Zoom customization', () => {
     });
 
     describe('custom value', () => {
-        beforeEach(async () => {
+        beforeEach((done) => {
             const appConfig: AppConfigService = TestBed.inject(AppConfigService);
             appConfig.config['adf-viewer.pdf-viewer-scaling'] = 80;
 
             fixtureUrlTestComponent.detectChanges();
-            await fixtureUrlTestComponent.whenRenderingDone();
-            await firstValueFrom(componentUrlTestComponent.pdfViewerComponent.rendered);
-        });
+
+            firstValueFrom(componentUrlTestComponent.pdfViewerComponent.rendered).then(() => {
+                done();
+            });
+        }, 55000);
 
         it('should use the custom zoom if it is present in the app.config', fakeAsync(() => {
             spyOn(componentUrlTestComponent.pdfViewerComponent.pdfViewer, 'forceRendering').and.callFake(() => {});
diff --git a/lib/js-api/src/test-setup.ts b/lib/js-api/src/test-setup.ts
index 32927d2cc4..01a3bf8e29 100644
--- a/lib/js-api/src/test-setup.ts
+++ b/lib/js-api/src/test-setup.ts
@@ -16,3 +16,4 @@
  */
 
 import 'jest-preset-angular/setup-jest';
+import 'resize-observer-polyfill/dist/ResizeObserver.global';