test(integration): verify account portal serves clerk-js v6

Why:
The AP E2E tests exercise sign-in/sign-up flows against staging Core 3
but never actually assert which clerk-js version the AP serves. If Core 3
started serving the wrong major version, these tests would still pass.

What changed:
Added testAPClerkJsVersion helper in common.ts that navigates to the AP,
waits for clerk-js to load, and checks window.Clerk.version starts with
the expected major version. Called from the v6 test file with '6'.

Author: nikosdouvlis

integration/tests/next-account-portal/clerk-ap-core-3-v6.test.ts

@@ -4,7 +4,7 @@ import type { Application } from '../../models/application';
 import { appConfigs } from '../../presets';
 import type { FakeUser } from '../../testUtils';
 import { createTestUtils } from '../../testUtils';
-import { testHandshakeRecovery, testSignIn, testSignOut, testSignUp, testSSR } from './common';
+import { testAPClerkJsVersion, testHandshakeRecovery, testSignIn, testSignOut, testSignUp, testSSR } from './common';
 
 test.describe('Next with ClerkJS V6 <-> Account Portal Core 3 @ap-flows', () => {
   test.describe.configure({ mode: 'serial' });
@@ -27,6 +27,10 @@ test.describe('Next with ClerkJS V6 <-> Account Portal Core 3 @ap-flows', () =>
     await app.teardown();
   });
 
+  test('AP serves clerk-js v6', async ({ page, context }) => {
+    await testAPClerkJsVersion({ app, page, context, fakeUser }, '6');
+  });
+
   test('sign in', async ({ page, context }) => {
     await testSignIn({ app, page, context, fakeUser });
   });

integration/tests/next-account-portal/common.ts

@@ -226,6 +226,26 @@ export const testSignOut = async ({ app, page, context, fakeUser }: TestParams)
   expect(apURL).toMatch(/\.accounts(stage\.dev|\.dev|\.stg)/);
 };
 
+export const testAPClerkJsVersion = async ({ app, page, context }: TestParams, expectedMajorVersion: string) => {
+  const u = createTestUtils({ app, page, context, useTestingToken: false });
+
+  await u.page.goToAppHome();
+  await u.page.waitForClerkJsLoaded();
+  await u.po.expect.toBeSignedOut();
+
+  // Navigate to the Account Portal
+  await u.page.getByRole('button', { name: /Sign in/i }).click();
+  await u.po.signIn.waitForMounted();
+
+  const accountPortalURL = page.url();
+  expect(accountPortalURL).toMatch(/\.accounts(stage\.dev|\.dev|\.stg)/);
+
+  // Verify the clerk-js version served by the Account Portal
+  const clerkVersion = await page.evaluate(() => window.Clerk?.version);
+  expect(clerkVersion).toBeDefined();
+  expect(clerkVersion).toMatch(new RegExp(`^${expectedMajorVersion}\\.`));
+};
+
 export const testHandshakeRecovery = async ({ app, page, context, fakeUser }: TestParams) => {
   const u = createTestUtils({ app, page, context, useTestingToken: false });