test: Use common.mustCall in http test

PR-URL: #17487
Refs: #17169
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>

test/parallel/test-http-pipeline-regr-2639.js

@@ -1,33 +1,24 @@
 'use strict';
-require('../common');
-const assert = require('assert');
+const common = require('../common');
 const http = require('http');
 const net = require('net');
 
 const COUNT = 10;
 
-let received = 0;
-
-const server = http.createServer(function(req, res) {
+const server = http.createServer(common.mustCall((req, res) => {
   // Close the server, we have only one TCP connection anyway
-  if (received++ === 0)
-    server.close();
-
+  server.close();
   res.writeHead(200);
   res.write('data');
 
   setTimeout(function() {
     res.end();
   }, (Math.random() * 100) | 0);
-}).listen(0, function() {
+}, COUNT)).listen(0, function() {
   const s = net.connect(this.address().port);
 
   const big = 'GET / HTTP/1.0\r\n\r\n'.repeat(COUNT);
 
   s.write(big);
   s.resume();
 });
-
-process.on('exit', function() {
-  assert.strictEqual(received, COUNT);
-});