test: update visit 404 page test case

tests/exception-page.spec.ts

@@ -8,8 +8,7 @@ loadPage();
 test.describe('exception page', () => {
   test('visit 404 page', async ({ page }) => {
     await page.goto('http://localhost:8080/404');
-    await page.waitForTimeout(1000);
-    const notFoundTip = page.getByText('404 - Page Not Found');
-    expect(await notFoundTip.isVisible()).toBe(true);
+    const notFoundTip = page.locator('[data-testid=notFound]');
+    await expect(notFoundTip).toBeVisible();
   });
 });