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

common = require("../common");
assert = common.assert
spawn = require('child_process').spawn,
path = require('path');

var returns = 0;

/*
  Spawns 'pwd' with given options, then test 
  - whether the exit code equals forCode,
  - optionally whether the stdout result (after removing traling whitespace) matches forData
*/
function testCwd(options, forCode, forData) {
  var data = "";
  
  var child = spawn('pwd', [], options);
  child.stdout.setEncoding('utf8');

  child.stdout.addListener('data', function(chunk) {
    data += chunk;
  });
  
  child.addListener('exit', function(code, signal) {
    forData && assert.strictEqual(forData, data.replace(/[\s\r\n]+$/, ''))
    assert.strictEqual(forCode, code);
    returns--;
  });
  
  returns++;
}

// Assume these exist, and 'pwd' gives us the right directory back
testCwd( { cwd: '/bin'    }, 0, '/bin' );
testCwd( { cwd: '/dev'    }, 0, '/dev' );
testCwd( { cwd: '/'       }, 0, '/'    );

// Assume this doesn't exist, we expect exitcode=127
testCwd( { cwd: 'does-not-exist' }, 127 );

// Spawn() shouldn't try to chdir() so this should just work
testCwd( undefined,          0 );
testCwd( {                }, 0 );
testCwd( { cwd: ''        }, 0 );
testCwd( { cwd: undefined }, 0 );
testCwd( { cwd: null      }, 0 );

// Check whether all tests actually returned
assert.notEqual(0, returns);
process.addListener('exit', function () {
  assert.equal(0, returns);
});