text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // 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
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  require('../common');
  var assert = require('assert');
  var exec = require('child_process').exec;
  var os = require('os');
  
  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 + os.EOL, 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 + os.EOL, stdout.toString());
  
    success_count++;
  });
  
  process.on('exit', function() {
    assert.equal(2, success_count);
  });
  