Modify tests to use Directory.systemTemp

tests/standalone/io/resolve_symbolic_links_test.dart

 // Copyright (c) 2013, 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.
 //
 // Dart test program for testing FileSystemEntity.resolveSymbolicLinks
 
 import "package:expect/expect.dart";
 import "package:path/path.dart";
 import "package:async_helper/async_helper.dart";
 import 'dart:async';
@@ skipping 11 matching lines @@
 
   asyncTest(() => testDir(join(testsDir, 'standalone', 'io')));
   asyncTest(() => testDir(join(testsDir, 'lib', '..', 'standalone', 'io')));
   // Test a relative path.
   asyncTest(() => testDir('.'));
   if (Platform.isWindows) {
     asyncTest(() =>testFile(join('\\\\?\\$testsDir', 'standalone', 'io',
                                  'resolve_symbolic_links_test.dart')));
     asyncTest(() => testDir('\\\\?\\$testsDir'));
   }
-  asyncTest(() => new Directory('').createTemp().then((tempDir) {
+  asyncTest(() => Directory.systemTemp.createTemp('dart_resolve_symbolic_links')
+      .then((tempDir) {
     String temp = tempDir.path;
     return makeEntities(temp).then((_) => Future.wait(
         [testFile(join(temp, 'dir1', 'file1')),
          testFile(join(temp, 'link1', 'file2')),
          testDir(join(temp, 'dir1', 'dir2', '..', '.', '..', 'dir1')),
          testDir(join(temp, 'dir1', 'dir2', '..', '.', '..', 'dir1')),
          testLink(join(temp, 'link1'))]))
     .then((_) {
       if (Platform.isWindows) {
         // Windows applies '..' to a link without resolving the link first.
@@ skipping 95 matching lines @@
     Expect.isTrue(isAbsolute(resolved));
     // Test that resolveSymbolicLinks removes all links, .., and . segments.
     Expect.isFalse(resolved.contains('..'));
     Expect.isFalse(resolved.contains('./'));
     Expect.isFalse(resolved.contains('link1'));
     return new Link(name).target()
         .then((targetName) => FileSystemEntity.identical(targetName, resolved))
         .then((identical) => Expect.isTrue(identical));
   });
 }