node/test/simple/test-child-process-deprecated-api.js

var common = require("../common");
var assert = common.assert;
var spawn  = require('child_process').spawn;
var path   = require('path');
var fs     = require('fs');
var exits  = 0;

// Test `env` parameter for child_process.spawn(path, args, env, customFds) deprecated api
(function() {
  var response = "";
  var child = spawn('/usr/bin/env', [], {'HELLO' : 'WORLD'});

  child.stdout.setEncoding('utf8');

  child.stdout.addListener("data", function (chunk) {
    response += chunk;
  });

  process.addListener('exit', function () {
   assert.ok(response.indexOf('HELLO=WORLD') >= 0);
   exits++;
  });
})();

// Test `customFds` parameter for child_process.spawn(path, args, env, customFds) deprecated api
(function() {
  var expected = "hello world";
  var helloPath = path.join(common.fixturesDir, "hello.txt");

  fs.open(helloPath, 'w', 400, function (err, fd) {
    if (err) throw err;

    var child = spawn('/bin/echo', [expected], undefined, [-1, fd]);

    assert.notEqual(child.stdin, null);
    assert.equal(child.stdout, null);
    assert.notEqual(child.stderr, null);

    child.addListener('exit', function (err) {
      if (err) throw err;

      fs.close(fd, function (error) {
        if (error) throw error;

        fs.readFile(helloPath, function (err, data) {
          if (err) throw err;

          assert.equal(data.toString(), expected + "\n");
          exits++;
        });
      });
    });
  });
})();

// Check if all child processes exited
process.addListener('exit', function () {
  assert.equal(2, exits);
});