Update argv0 test to verify correct behavior

test/simple/test-process-argv-0.js

@@ -24,17 +24,24 @@ var assert = require('assert');
 var spawn = require('child_process').spawn;
 var common = require('../common');
 
+console.error('argv=%j', process.argv);
+console.error('exec=%j', process.execPath);
+
 if (process.argv[2] !== "child") {
-  var child = spawn('node', [__filename, "child"], {
-    cwd: common.tmpDir,
-    env: util._extend({ PATH: path.dirname(process.execPath) }, process.env)
+  var child = spawn('./node', [__filename, "child"], {
+    cwd: path.dirname(process.execPath)
   });
 
   var childArgv0 = '';
-  child.stdout.on('data', function (chunk) {
+  var childErr = '';
+  child.stdout.on('data', function(chunk) {
     childArgv0 += chunk;
   });
+  child.stderr.on('data', function(chunk) {
+    childErr += chunk;
+  });
   child.on('exit', function () {
+    console.error('CHILD: %s', childErr.trim().split('\n').join('\nCHILD: '));
     assert.equal(childArgv0, process.execPath);
   });
 }