test: update test setup for stable after()

Author: pieh

tests/e2e/after.test.ts

@@ -3,7 +3,10 @@ import { nextVersionSatisfies } from '../utils/next-version-helpers.mjs'
 import { test } from '../utils/playwright-helpers.js'
 
 test('next/after callback is executed and finishes', async ({ page, after }) => {
-  test.skip(!nextVersionSatisfies('>=15.0.0'), 'This test is only for Next.js 15+')
+  test.skip(
+    !nextVersionSatisfies('>=15.1.0'),
+    'This test is only for Next.js >=15.1.0 that has stable after() support',
+  )
 
   // trigger initial request to check page which might be stale and allow regenerating in background
   await page.goto(`${after.url}/after/check`)

tests/fixtures/after/app/after/trigger/page.js

@@ -1,5 +1,5 @@
 import { revalidatePath } from 'next/cache'
-import { unstable_after as after, connection } from 'next/server'
+import { after, connection } from 'next/server'
 
 export default async function Page() {
   await connection()

tests/fixtures/after/next.config.js

@@ -4,9 +4,6 @@ const nextConfig = {
   eslint: {
     ignoreDuringBuilds: true,
   },
-  experimental: {
-    after: true,
-  },
 }
 
 module.exports = nextConfig

tests/fixtures/after/package.json

@@ -14,7 +14,7 @@
   },
   "test": {
     "dependencies": {
-      "next": ">=15.0.0"
+      "next": ">=15.1.0"
     }
   }
 }