test: refactored http test to use countdown

PR-URL: #17241
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>

Author: mithunsasidharan

test/parallel/test-http-end-throw-socket-handling.js

@@ -1,5 +1,6 @@
 'use strict';
 const common = require('../common');
+const Countdown = require('../common/countdown');
 
 // Make sure that throwing in 'end' handler doesn't lock
 // up the socket forever.
@@ -8,10 +9,10 @@ const common = require('../common');
 // the same, we should not be so brittle and easily broken.
 
 const http = require('http');
+const countdown = new Countdown(10, () => server.close());
 
-let n = 0;
 const server = http.createServer((req, res) => {
-  if (++n === 10) server.close();
+  countdown.dec();
   res.end('ok');
 });