node/test/simple/test-child-process-exec-buffer.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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require('../common');
var assert = require('assert');
var exec = require('child_process').exec;

var success_count = 0;

var str = 'hello';

// default encoding
var child = exec("echo " + str, function(err, stdout, stderr) {
  assert.ok('string', typeof(stdout), 'Expected stdout to be a string');
  assert.ok('string', typeof(stderr), 'Expected stderr to be a string');
  assert.equal(str + '\n', stdout);

  success_count++;
});

// no encoding (Buffers expected)
var child = exec("echo " + str, {
  encoding: null
}, function(err, stdout, stderr) {
  assert.ok(stdout instanceof Buffer, 'Expected stdout to be a Buffer');
  assert.ok(stderr instanceof Buffer, 'Expected stderr to be a Buffer');
  assert.equal(str + '\n', stdout.toString());

  success_count++;
});

process.on('exit', function() {
  assert.equal(2, success_count);
});