node/test/simple/test-debug-cluster.js

// Copyright Joyent, Inc. and other Node contributors.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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var common = require('../common');
var assert = require('assert');
var spawn = require('child_process').spawn;

var args = ['--debug', common.fixturesDir + '/clustered-server/app.js' ];
var child = spawn(process.execPath, args);
var outputLines = [];

child.stderr.on('data', function(data) {
  var lines = data.toString().replace(/\r/g, '').trim().split('\n');
  var line = lines[0];

  lines.forEach(function(ln) { console.log('> ' + ln) } );

  if (line === 'all workers are running') {
    assertOutputLines();
    process.exit();
  } else {
    outputLines = outputLines.concat(lines);
  }
});

process.on('exit', function onExit() {
  child.kill();
});

var assertOutputLines = common.mustCall(function() {
  var expectedLines = [
    'Debugger listening on port ' + 5858,
    'Debugger listening on port ' + 5859,
    'Debugger listening on port ' + 5860,
  ];

  // Do not assume any particular order of output messages,
  // since workers can take different amout of time to
  // start up
  outputLines.sort();

  assert.equal(outputLines.length, expectedLines.length)
  for (var i = 0; i < expectedLines.length; i++)
    assert.equal(outputLines[i], expectedLines[i]);
});