tests: add exception page test

tests/exception-page.spec.ts

@@ -0,0 +1,15 @@
+import { test, expect } from '@playwright/test';
+import { loadPage } from './libs/load-page';
+
+loadPage();
+
+// ps aux | grep 8080
+test.describe('exception page', () => {
+  test('bisit 404 page', async ({ page }) => {
+    await page.goto('http://localhost:8080/404');
+    await page.waitForTimeout(300);
+    const notFoundTipDom = await page.getByText('404 - Page Not Found');
+
+    await expect(await notFoundTipDom.isVisible()).toBe(true);
+  });
+});