Fix platform executable test.

tests/standalone/io/platform_executable_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Process test program to test process communication.
 
 library PlatformExecutableTest;
 
 import "dart:io";
 
@@ skipping 26 matching lines @@
   var result = processResult.stdout.trim();
   expectEquals(Platform.executable, result);
 }
 
 void testDartExecShouldNotBeInCurrentDir() {
   var type = FileSystemEntity.typeSync(platformExeName);
   expectEquals(FileSystemEntityType.NOT_FOUND, type);
 }
 
 void testShouldSucceedWithEmptyPathEnvironment() {
-  Process.runSync(platformExeName, ['--version'],
+  var command = Platform.isWindows ? 'dir' : 'ls';
+  Process.runSync(command, [],
                   includeParentEnvironment: false,
                   environment: {_SCRIPT_KEY: 'yes', 'PATH': ''});
 }
 
 void testShouldSucceedWithSourcePlatformExecutable() {
   //print('*** Running normally');
   verify(Platform.executable);
 }
 
 void testExeSymLinked(Directory dir) {
@@ skipping 76 matching lines @@
 
   testDartExecShouldNotBeInCurrentDir();
   testShouldSucceedWithSourcePlatformExecutable(); /// 00: ok
   withTempDir(testExeSymLinked); /// 01: ok
   withTempDir(testExeDirSymLinked); /// 02: ok
   testPathToSDKDir(); /// 03: ok
   withTempDir(testPathPointsToSymLinkedSDKPath); /// 04: ok
   withTempDir(testPathToDirWithExeSymLinked); /// 05: ok
   testShouldSucceedWithEmptyPathEnvironment(); /// 06: ok
 }