node/test/simple/test-cluster-net-listen.js

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var common = require('../common');
var assert = require('assert');
var cluster = require('cluster');
var net = require('net');

if (cluster.isMaster) {
  // ensure that the worker exits peacefully
  var worker = cluster.fork();
  worker.on('exit', function(statusCode) {
    assert.equal(statusCode, 0);
    worker = null;
  });
  process.on('exit', function() {
    assert.equal(worker, null);
  });
}
else {
  // listen() without port should not trigger a libuv assert
  net.createServer(assert.fail).listen(process.exit);
}