test: use random ports where possible

This helps to prevent issues where a failed test can keep a bound
socket open long enough to cause other tests to fail with EADDRINUSE
because the same port number is used.

PR-URL: https://github.com/nodejs/node/pull/7045
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/test/parallel/test-net-persistent-ref-unref.js b/test/parallel/test-net-persistent-ref-unref.js
index b3ea0969f3..32782e7c59 100644
--- a/test/parallel/test-net-persistent-ref-unref.js
+++ b/test/parallel/test-net-persistent-ref-unref.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var net = require('net');
 var TCPWrap = process.binding('tcp_wrap').TCP;
@@ -25,13 +25,13 @@ TCPWrap.prototype.unref = function() {
   assert.equal(refCount, -1);
 };
 
-echoServer.listen(common.PORT);
+echoServer.listen(0);
 
 echoServer.on('listening', function() {
   var sock = new net.Socket();
   sock.unref();
   sock.ref();
-  sock.connect(common.PORT);
+  sock.connect(this.address().port);
   sock.on('end', function() {
     assert.equal(refCount, 0);
     echoServer.close();