diff --git a/lib/core/karma.conf.js b/lib/core/karma.conf.js
index 424c36f419..8f8ba32b11 100644
--- a/lib/core/karma.conf.js
+++ b/lib/core/karma.conf.js
@@ -30,7 +30,8 @@ module.exports = function (config) {
                 included: false,
                 served: true,
                 watched: false
-            }
+            },
+            { pattern: 'node_modules/resize-observer-polyfill/dist/ResizeObserver.global.js', included: true, watched: false },
         ],
 
         frameworks: ['jasmine-ajax', 'jasmine', '@angular-devkit/build-angular'],
@@ -73,7 +74,8 @@ module.exports = function (config) {
         client: {
             clearContext: false,
             jasmine: {
-                random: false
+                random: false,
+                DEFAULT_TIMEOUT_INTERVAL: 80000
             }
         },
         jasmineHtmlReporter: {
@@ -110,7 +112,7 @@ module.exports = function (config) {
         logLevel: constants.LOG_INFO,
         autoWatch: true,
         browsers: ['ChromeHeadless'],
-        singleRun: false
+        singleRun: true
     });
     process.env.TZ = 'UTC';
 };
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 6065563ff4..6bbbf71a52 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
@@ -107,43 +107,6 @@ xdescribe('Test PdfViewer component', () => {
     let dialog: MatDialog;
     let testingUtils: UnitTestingUtils;
 
-    const originalPdfjsLib = window['pdfjsLib'];
-
-    beforeAll(() => {
-        Object.defineProperty(window, 'pdfjsLib', {
-          configurable: true,
-          value: {
-            PasswordResponses: {
-              NEED_PASSWORD: 'NEED_PASSWORD',
-              INCORRECT_PASSWORD: 'INCORRECT_PASSWORD'
-            },
-            GlobalWorkerOptions: { workerSrc: 'fake-worker.js' },
-            getDocument: (_src: any) => {
-              const pdfDocument = {
-                numPages: 10,
-                getPage: (pageNumber: number) =>
-                  Promise.resolve({
-                    pageNumber,
-                    getTextContent: () => Promise.resolve({ items: [] })
-                  }),
-                eventBus: {
-                  dispatch: (_event: string, _args: any) => {}
-                }
-              };
-              return {
-                promise: Promise.resolve(pdfDocument),
-                destroy: () => {}  // dummy destroy method
-              };
-            }
-          }
-        });
-    });
-
-    afterAll(() => {
-        // Restore the original value
-        window['pdfjsLib'] = originalPdfjsLib;
-    });
-
     beforeEach(async () => {
         TestBed.configureTestingModule({
             imports: [NoopAuthModule, NoopTranslateModule, PdfViewerComponent],
@@ -431,7 +394,7 @@ fdescribe('Test PdfViewer - Zoom customization', () => {
             spyOn(componentUrlTestComponent.pdfViewerComponent.pdfViewer, 'forceRendering').and.callFake(() => {});
 
             fixtureUrlTestComponent.detectChanges();
-            tick();
+            tick(2000);
 
             expect(componentUrlTestComponent.pdfViewerComponent.pdfViewer.currentScale).toBe(0.8);
         }));
diff --git a/package-lock.json b/package-lock.json
index 58ffe6a3da..e607b53e55 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -149,6 +149,7 @@
         "postcss": "8.4.41",
         "postcss-sass": "^0.5.0",
         "prettier": "2.8.8",
+        "resize-observer-polyfill": "^1.5.1",
         "rimraf": "6.0.1",
         "sass-loader": "16.0.4",
         "shelljs": "^0.8.5",
@@ -36053,6 +36054,13 @@
       "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
       "license": "MIT"
     },
+    "node_modules/resize-observer-polyfill": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/resize-observer-polyfill/-/resize-observer-polyfill-1.5.1.tgz",
+      "integrity": "sha512-LwZrotdHOo12nQuZlHEmtuXdqGoOD0OhaxopaNFxWzInpEgaLWoVuAMbTzixuosCx2nEG58ngzW3vxdWoxIgdg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/resolve": {
       "version": "1.22.8",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.8.tgz",
diff --git a/package.json b/package.json
index c6cfe6864c..5ab1e50f99 100644
--- a/package.json
+++ b/package.json
@@ -169,6 +169,7 @@
     "postcss": "8.4.41",
     "postcss-sass": "^0.5.0",
     "prettier": "2.8.8",
+    "resize-observer-polyfill": "^1.5.1",
     "rimraf": "6.0.1",
     "sass-loader": "16.0.4",
     "shelljs": "^0.8.5",