test: add matrix strategy to run integration tests across multiple Next.js versions

- Add matrix strategy to CI workflow to test against Next.js 15.0.3, 15.3.2, and 15.4.7
- Make test app selection dynamic via NEXT_TEST_APP environment variable
- Update integration test paths to use matrix variable instead of hardcoded version

Author: JannikZed

.github/workflows/ci.yml

@@ -23,6 +23,12 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       pull-requests: write # Grant write access to pull request comments
+    strategy:
+      matrix:
+        next-test-app:
+          - next-app-15-0-3
+          - next-app-15-3-2
+          - next-app-15-4-7
 
     steps:
       - name: Checkout code
@@ -59,15 +65,16 @@ jobs:
         run: redis-cli config set notify-keyspace-events Exe
 
       - name: Install Integration Test Project
-        run: cd test/integration/next-app-15-3-2 && pnpm install
+        run: cd test/integration/${{ matrix.next-test-app }} && pnpm install
 
       - name: Build Integration Test Project
-        run: cd test/integration/next-app-15-3-2 && pnpm build
+        run: cd test/integration/${{ matrix.next-test-app }} && pnpm build
 
       - name: Run tests
         run: pnpm test
         env:
           SKIP_BUILD: true
+          NEXT_TEST_APP: ${{ matrix.next-test-app }}
 
       - name: Code Coverage Comments
         if: github.event_name == 'pull_request'

test/integration/nextjs-cache-handler.integration.test.ts

@@ -6,8 +6,10 @@ import { join } from 'path';
 import { CacheEntry } from '../../src/RedisStringsHandler';
 import { revalidate as next1503_revalidatedFetch_route } from './next-app-15-0-3/src/app/api/revalidated-fetch/route';
 
-// const NEXT_APP_DIR = join(__dirname, 'next-app-15-0-3');
-const NEXT_APP_DIR = join(__dirname, 'next-app-15-4-7');
+// Select which Next.js test app to use. Can be overridden via NEXT_TEST_APP env var
+// Examples: next-app-15-0-3, next-app-15-3-2, next-app-15-4-7
+const NEXT_TEST_APP = process.env.NEXT_TEST_APP || 'next-app-15-4-7';
+const NEXT_APP_DIR = join(__dirname, NEXT_TEST_APP);
 console.log('NEXT_APP_DIR', NEXT_APP_DIR);
 const NEXT_START_PORT = 3055;
 const NEXT_START_URL = `http://localhost:${NEXT_START_PORT}`;