fix(tests): Add missing helper function.

tests/helpers/Participant.ts

@@ -927,6 +927,26 @@ export class Participant {
         return await this.isRemoteVideoReceived(endpointId) && await this.isRemoteVideoDisplayed(endpointId);
     }
 
+    /**
+     * Waits for a specific participant to be displayed on large video.
+     *
+     * @param {string} expectedEndpointId - The endpoint ID of the participant expected on large video.
+     * @param {string} timeoutMsg - Optional custom timeout message.
+     * @param {number} timeout - Optional timeout in milliseconds (default: 30000).
+     * @returns {Promise<void>}
+     */
+    async waitForParticipantOnLargeVideo(
+            expectedEndpointId: string,
+            timeoutMsg?: string,
+            timeout: number = 30_000): Promise<void> {
+        await this.driver.waitUntil(
+            async () => await this.getLargeVideo().getResource() === expectedEndpointId,
+            {
+                timeout,
+                timeoutMsg: timeoutMsg || `Expected ${expectedEndpointId} on large video for ${this.name}`
+            });
+    }
+
     /**
      * Waits for remote video state - receiving and displayed.
      * @param endpointId

tests/specs/media/desktopSharing.spec.ts

@@ -63,11 +63,12 @@ describe('Desktop sharing', () => {
             }
         });
         const { p1, p2, p3 } = ctx;
+        const p2EndpointId = await p2.getEndpointId();
 
         // Check if a remote screen share tile is created on all participants.
         await checkForScreensharingTile(p2, p1);
         await checkForScreensharingTile(p2, p2);
-        await checkForScreensharingTile(p2, p2);
+        await checkForScreensharingTile(p2, p3);
 
         await p1.getFilmstrip().assertNoGapsInFilmstrip();
         await p3.getFilmstrip().assertNoGapsInFilmstrip();