node/test/simple/test-child-process-ipc.js

require("../common");

var spawn = require('child_process').spawn;

var path = require('path');

var sub = path.join(fixturesDir, 'echo.js');

var gotHelloWorld = false;
var gotEcho = false;

var child = spawn(process.argv[0], [sub]);

child.stderr.addListener("data", function (data){
  puts("parent stderr: " + data);
});

child.stdout.setEncoding('utf8');

child.stdout.addListener("data", function (data){
  puts('child said: ' + JSON.stringify(data));
  if (!gotHelloWorld) {
    assert.equal("hello world\r\n", data);
    gotHelloWorld = true;
    child.stdin.write('echo me\r\n');
  } else {
    assert.equal("echo me\r\n", data);
    gotEcho = true;
    child.stdin.close();
  }
});

child.stdout.addListener("end", function (data){
  puts('child end');
});


process.addListener('exit', function () {
  assert.ok(gotHelloWorld);
  assert.ok(gotEcho);
});