diff --git a/tests/e2e/pr-174/collapsible-sections-script-loaded.spec.ts b/tests/e2e/pr-174/collapsible-sections-script-loaded.spec.ts
new file mode 100644
index 0000000..bfb0c41
--- /dev/null
+++ b/tests/e2e/pr-174/collapsible-sections-script-loaded.spec.ts
@@ -0,0 +1,15 @@
+import { test, expect } from '@playwright/test';
+
+test('Collapsible sections helper script is served', async ({ page, request }) => {
+  // Step 1: Navigate to the preview root URL
+  await page.goto('/');
+  await page.waitForLoadState('domcontentloaded');
+
+  // Step 2: Request /js/collapsible-sections.js
+  const response = await request.get('/js/collapsible-sections.js');
+
+  // Assertion: HTTP 200 and contains the initCollapsibleSections function
+  expect(response.status()).toBe(200);
+  const body = await response.text();
+  expect(body).toContain('initCollapsibleSections');
+});