diff --git a/modules/ui/src/app/pages/testrun/progress.component.spec.ts b/modules/ui/src/app/pages/testrun/progress.component.spec.ts
index 4733a7b65..5e9506e1b 100644
--- a/modules/ui/src/app/pages/testrun/progress.component.spec.ts
+++ b/modules/ui/src/app/pages/testrun/progress.component.spec.ts
@@ -82,8 +82,9 @@ describe('ProgressComponent', () => {
 
   describe('Class tests', () => {
     beforeEach(() => {
+      // @ts-expect-error data layer should be defined
+      window.dataLayer = window.dataLayer || [];
       testRunServiceMock.stopTestrun.and.returnValue(of(true));
-
       TestBed.configureTestingModule({
         declarations: [
           ProgressComponent,
@@ -209,6 +210,8 @@ describe('ProgressComponent', () => {
     beforeEach(async () => {
       testRunServiceMock.stopTestrun.and.returnValue(of(true));
       testRunServiceMock.testrunInProgress.and.returnValue(false);
+      // @ts-expect-error data layer should be defined
+      window.dataLayer = window.dataLayer || [];
 
       await TestBed.configureTestingModule({
         declarations: [
diff --git a/modules/ui/src/app/pages/testrun/progress.component.ts b/modules/ui/src/app/pages/testrun/progress.component.ts
index 6501e4460..eb501dcc6 100644
--- a/modules/ui/src/app/pages/testrun/progress.component.ts
+++ b/modules/ui/src/app/pages/testrun/progress.component.ts
@@ -144,6 +144,10 @@ export class ProgressComponent implements OnInit, OnDestroy {
       .pipe(takeUntil(this.destroy$))
       .subscribe((startTestrun: boolean) => {
         if (startTestrun) {
+          // @ts-expect-error data layer is not null
+          window.dataLayer.push({
+            event: 'successful_testrun_initiation',
+          });
           this.testrunStore.setIsTestrunStarted(true);
           this.testrunStore.getStatus();
         }