first commit

test/integration/middleware-basic/middleware.ts

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+import { NextResponse } from 'next/server'
+
+export default function () {
+  const response = NextResponse.next()
+  response.headers.set('X-From-Middleware', 'true')
+  return response
+}

test/integration/middleware-basic/next.config.js

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+module.exports = {
+  experimental: {
+    turbopackMinify: false,
+    turbopackModuleIds: 'named',
+    turbopackScopeHoisting: false,
+  },
+}

test/integration/middleware-basic/pages/index.js

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+const Page = () => <h1>Hi from SRC</h1>
+export default Page

test/integration/middleware-basic/test/index.test.ts

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+/* eslint-env jest */
+
+import fs from 'fs-extra'
+import { join } from 'path'
+import {
+  fetchViaHTTP,
+  findPort,
+  launchApp,
+  killApp,
+  nextBuild,
+  nextStart,
+} from 'next-test-utils'
+
+let app
+let appPort
+const appDir = join(__dirname, '../')
+const header = 'X-From-Middleware'
+
+function runTest() {
+  it('loads a middleware', async () => {
+    const response = await fetchViaHTTP(appPort, '/post-1')
+    expect(response.headers.has(header)).toBe(true)
+  })
+}
+
+;(process.env.TURBOPACK_BUILD ? describe.skip : describe)(
+  'development mode',
+  () => {
+    beforeAll(async () => {
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(() => killApp(app))
+
+    runTest()
+  }
+)
+
+// TODO enable that once turbopack supports middleware in development mode
+;(process.env.TURBOPACK_DEV ? describe.skip : describe)(
+  'production mode',
+  () => {
+    beforeAll(async () => {
+      await nextBuild(appDir)
+
+      const outdir = join(__dirname, '..', 'out')
+      await fs.remove(outdir).catch(() => {})
+
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(() => killApp(app))
+
+    runTest()
+  }
+)