add tests (#536)

tests/libs/load-page.ts

@@ -0,0 +1,9 @@
+import { test } from '@playwright/test';
+
+export function loadPage() {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('http://localhost:3000');
+    // waiting for page loading end
+    await page.waitForTimeout(1000);
+  });
+}