test: adjust assertion for index page cache tags

Author: pieh

tests/integration/simple-app.test.ts

@@ -39,6 +39,7 @@ import {
   nextVersionSatisfies,
   shouldHaveAppRouterGlobalErrorInPrerenderManifest,
   shouldHaveAppRouterNotFoundInPrerenderManifest,
+  shouldHaveSlashIndexTagForIndexPage,
 } from '../utils/next-version-helpers.mjs'
 
 const mockedCp = cp as Mock<(typeof import('node:fs/promises'))['cp']>
@@ -205,7 +206,11 @@ test<FixtureTestContext>('index should be normalized within the cacheHandler and
   await runPlugin(ctx)
   const index = await invokeFunction(ctx, { url: '/' })
   expect(index.statusCode).toBe(200)
-  expect(index.headers?.['netlify-cache-tag']).toBe('_N_T_/layout,_N_T_/page,_N_T_/')
+  expect(index.headers?.['netlify-cache-tag']).toBe(
+    shouldHaveSlashIndexTagForIndexPage()
+      ? '_N_T_/layout,_N_T_/page,_N_T_/,_N_T_/index'
+      : '_N_T_/layout,_N_T_/page,_N_T_/',
+  )
 })
 
 // with 15.0.0-canary.187 and later Next.js no longer produce `stale-while-revalidate` directive

tests/utils/next-version-helpers.mjs

@@ -53,6 +53,11 @@ export function hasDefaultTurbopackBuilds() {
   return nextVersionSatisfies('>=15.6.0-canary.40')
 }
 
+export function shouldHaveSlashIndexTagForIndexPage() {
+  // https://github.com/vercel/next.js/pull/84586
+  return nextVersionSatisfies('>=v15.6.0-canary.50')
+}
+
 /**
  * Check if current next version requires React 19
  * @param {string} version Next version