test: verify that there are no errors on the website (#6365)

closes: #6354

packages/website/tests/index.spec.ts

@@ -1,7 +1,22 @@
 import AxeBuilder from '@axe-core/playwright';
-import { test } from '@playwright/test';
+import { expect, test } from '@playwright/test';
 
-test('Index', async ({ page }) => {
-  await page.goto('/');
-  await new AxeBuilder({ page }).analyze();
+test.describe('Website', () => {
+  test('Axe', async ({ page }) => {
+    await page.goto('/');
+    await new AxeBuilder({ page }).analyze();
+  });
+
+  test('should have no errors', async ({ page }) => {
+    const errorMessages: string[] = [];
+    page.on('console', msg => {
+      if (['error', 'warning'].includes(msg.type())) {
+        errorMessages.push(`[${msg.type()}] ${msg.text()}`);
+      }
+    });
+    await page.goto('/');
+    expect(errorMessages).toStrictEqual([
+      "[error] Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot",
+    ]);
+  });
 });