chore: import upstream snapshot with attribution

e2e/preview.spec.ts

@@ -0,0 +1,45 @@
+import { expect, test } from '@playwright/test';
+import translations from '../client/i18n/locales/english/translations.json';
+import { focusEditor } from './utils/editor';
+
+test.beforeEach(async ({ page }) => {
+  await page.goto(
+    '/learn/2022/responsive-web-design/learn-html-by-building-a-cat-photo-app/step-3'
+  );
+});
+
+test.describe('Challenge Preview Component', () => {
+  test('should render correct output for default and changed code', async ({
+    page,
+    isMobile
+  }) => {
+    if (isMobile) {
+      await page
+        .getByRole('tab', { name: translations.learn['editor-tabs'].preview })
+        .click();
+    }
+
+    // Check default code output
+    await expect(
+      page
+        .frameLocator('.challenge-preview-frame')
+        .getByRole('heading', { name: 'CatPhotoApp' })
+    ).toBeVisible();
+
+    // Change code
+    await focusEditor({ page, isMobile });
+    await page.keyboard.insertText('<h1>FreeCodeCamp</h1>');
+    if (isMobile) {
+      await page
+        .getByRole('tab', { name: translations.learn['editor-tabs'].preview })
+        .click();
+    }
+
+    // Check changed code output
+    await expect(
+      page
+        .frameLocator('.challenge-preview-frame')
+        .getByRole('heading', { name: 'FreeCodeCamp' })
+    ).toBeVisible();
+  });
+});