Add middleware test

packages/next/test/fixtures/00-middleware-matcher/index.test.js

@@ -0,0 +1,8 @@
+const path = require('path');
+const { deployAndTest } = require('../../utils');
+
+describe(`${__dirname.split(path.sep).pop()}`, () => {
+  it('should deploy and pass probe checks', async () => {
+    await deployAndTest(__dirname);
+  });
+});

packages/next/test/fixtures/00-middleware-matcher/middleware.js

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+import { NextResponse } from 'next/server';
+
+export function middleware() {
+  const response = NextResponse.next();
+  response.headers.set('x-foo', 'bar');
+  return response;
+}
+
+export const config = {
+  matcher: ['/'],
+};

packages/next/test/fixtures/00-middleware-matcher/next.config.js

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+module.exports = {
+  generateBuildId() {
+    return 'testing-build-id';
+  },
+};

packages/next/test/fixtures/00-middleware-matcher/package.json

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+{
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build"
+  },
+  "dependencies": {
+    "next": "canary",
+    "react": "latest",
+    "react-dom": "latest"
+  }
+}

packages/next/test/fixtures/00-middleware-matcher/pages/index.js

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+export default function Root() {
+  return (
+    <div>
+      <h1>Hi there!</h1>
+    </div>
+  );
+}

packages/next/test/fixtures/00-middleware-matcher/vercel.json

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+{
+  "version": 2,
+  "builds": [{ "src": "package.json", "use": "@vercel/next" }],
+  "probes": [
+    {
+      "path": "/_next/data/testing-build-id/index.json",
+      "status": 200,
+      "headers": { "x-nextjs-data": 1 },
+      "responseHeaders": { "x-foo": "bar" }
+    }
+  ]
+}