Modify tests to use Directory.systemTemp

tests/standalone/io/file_system_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.
 
 import "dart:io";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 
 createLink(String dst, String link, void callback()) {
   new Link(link).create(dst).then((_) => callback());
 }
 
 
 testFileExistsCreate() {
-  var temp = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
   var x = '${temp.path}${Platform.pathSeparator}x';
   var y = '${temp.path}${Platform.pathSeparator}y';
   createLink(x, y, () {
     Expect.isFalse(new File(y).existsSync());
     Expect.isFalse(new File(x).existsSync());
     Expect.isTrue(FileSystemEntity.isLinkSync(y));
     Expect.isFalse(FileSystemEntity.isLinkSync(x));
     Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(y));
     Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(x));
     Expect.equals(FileSystemEntityType.LINK,
@@ skipping 37 matching lines @@
     Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(y));
     Expect.equals(FileSystemEntityType.DIRECTORY, FileSystemEntity.typeSync(x));
     Expect.throws(() => new Link(y).targetSync());
 
     temp.deleteSync(recursive: true);
   });
 }
 
 
 testFileDelete() {
-  var temp = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
   var x = '${temp.path}${Platform.pathSeparator}x';
   var y = '${temp.path}${Platform.pathSeparator}y';
   new File(x).createSync();
   createLink(x, y, () {
     Expect.isTrue(new File(x).existsSync());
     Expect.isTrue(new File(y).existsSync());
     new File(y).deleteSync();
     Expect.isTrue(new File(x).existsSync());
     Expect.isFalse(new File(y).existsSync());
     createLink(x, y, () {
       Expect.isTrue(new File(x).existsSync());
       Expect.isTrue(new File(y).existsSync());
       new File(y).deleteSync();
       Expect.isTrue(new File(x).existsSync());
       Expect.isFalse(new File(y).existsSync());
       temp.deleteSync(recursive: true);
     });
   });
 }
 
 
 testFileWriteRead() {
-  var temp = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
   var x = '${temp.path}${Platform.pathSeparator}x';
   var y = '${temp.path}${Platform.pathSeparator}y';
   new File(x).createSync();
   createLink(x, y, () {
     var data = "asdf".codeUnits;
     var output = new File(y).openWrite(mode: FileMode.WRITE);
     output.add(data);
     output.close();
     output.done.then((_) {
       var read = new File(y).readAsBytesSync();
       Expect.listEquals(data, read);
       var read2 = new File(x).readAsBytesSync();
       Expect.listEquals(data, read2);
       temp.deleteSync(recursive: true);
     });
   });
 }
 
 
 testDirectoryExistsCreate() {
-  var temp = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
   var x = '${temp.path}${Platform.pathSeparator}x';
   var y = '${temp.path}${Platform.pathSeparator}y';
   createLink(x, y, () {
     Expect.isFalse(new Directory(x).existsSync());
     Expect.isFalse(new Directory(y).existsSync());
     Expect.throws(new Directory(y).createSync);
     temp.deleteSync(recursive: true);
   });
 }
 
 
 testDirectoryDelete() {
-  var temp = new Directory('').createTempSync();
-  var temp2 = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
+  var temp2 = Directory.systemTemp.createTempSync('dart_file_system_links');
   var y = '${temp.path}${Platform.pathSeparator}y';
   var x = '${temp2.path}${Platform.pathSeparator}x';
   new File(x).createSync();
   createLink(temp2.path, y, () {
     var link = new Directory(y);
     Expect.isTrue(link.existsSync());
     Expect.isTrue(temp2.existsSync());
     link.deleteSync();
     Expect.isFalse(link.existsSync());
     Expect.isTrue(temp2.existsSync());
     createLink(temp2.path, y, () {
       Expect.isTrue(link.existsSync());
       temp.deleteSync(recursive: true);
       Expect.isFalse(link.existsSync());
       Expect.isTrue(temp2.existsSync());
       Expect.isTrue(new File(x).existsSync());
       temp2.deleteSync(recursive: true);
     });
   });
 }
 
 
 testDirectoryListing() {
   asyncStart();
-  var temp = new Directory('').createTempSync();
-  var temp2 = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
+  var temp2 = Directory.systemTemp.createTempSync('dart_file_system_links');
   var y = '${temp.path}${Platform.pathSeparator}y';
   var x = '${temp2.path}${Platform.pathSeparator}x';
   new File(x).createSync();
   createLink(temp2.path, y, () {
     var files = [];
     var dirs = [];
     for (var entry in temp.listSync(recursive:true)) {
       if (entry is File) {
         files.add(entry.path);
       } else {
@@ skipping 25 matching lines @@
           temp.deleteSync(recursive: true);
           temp2.deleteSync(recursive: true);
           asyncEnd();
         });
   });
 }
 
 
 testDirectoryListingBrokenLink() {
   asyncStart();
-  var temp = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
   var x = '${temp.path}${Platform.pathSeparator}x';
   var link = '${temp.path}${Platform.pathSeparator}link';
   var doesNotExist = 'this_thing_does_not_exist';
   new File(x).createSync();
   createLink(doesNotExist, link, () {
     temp.listSync(recursive: true);  // No exceptions.
     var files = [];
     var dirs = [];
     var links = [];
     var errors = [];
@@ skipping 28 matching lines @@
   if (Platform.operatingSystem != 'windows') {
     testFileExistsCreate();
     testFileDelete();
     testFileWriteRead();
     testDirectoryExistsCreate();
     testDirectoryDelete();
     testDirectoryListing();
     testDirectoryListingBrokenLink();
   }
 }