test: fix coverage

Author: asadali145

src/files-and-videos/videos-page/VideosPage.test.jsx

@@ -226,6 +226,12 @@ describe('Videos page', () => {
 
         expect(addThumbnailButton).toBeNull();
       });
+      it('should set thumbnailError when image fails to load', async () => {
+        await mockStore(RequestStatus.SUCCESSFUL);
+        const image = screen.getByRole('img');
+        fireEvent.error(image);
+        expect(screen.getByTestId('video-thumbnail-mOckID1')).toBeVisible();
+      });
       describe('with videos with backend status in_progress', () => {
         it('should render video with in progress status', async () => {
           await mockStore(RequestStatus.IN_PROGRESS);