Add synchronous directory listing to dart:io Directory.

tests/standalone/io/file_system_links_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.
 
 import "dart:io";
 
 
 createLink(String dst, String link, bool symbolic, void callback()) {
   var args = [ symbolic ? '-s' : '', dst, link ];
   var script = 'tests/standalone/io/ln.sh';
@@ skipping 109 matching lines @@
 
 testDirectoryListing() {
   var temp = new Directory('').createTempSync();
   var temp2 = new Directory('').createTempSync();
   var y = '${temp.path}${Platform.pathSeparator}y';
   var x = '${temp2.path}${Platform.pathSeparator}x';
   new File(x).createSync();
   createLink(temp2.path, y, true, () {
     var files = [];
     var dirs = [];
+    for (var entry in temp.listSync(recursive:true)) {
+      if (entry is File) {
+        files.add(entry.name);
+      } else {
+        Expect.isTrue(entry is Directory);
+        dirs.add(entry.path);
+      }
+    }
+    Expect.equals(1, files.length);
+    Expect.isTrue(files[0].endsWith(x));
+    Expect.equals(1, dirs.length);
+    Expect.isTrue(dirs[0].endsWith(y));
+
+    files = [];
+    dirs = [];
     var lister = temp.list(recursive: true);
     lister.onFile = (f) => files.add(f);
     lister.onDir = (d) => dirs.add(d);
     lister.onDone = (success) {
       Expect.isTrue(success);
       Expect.equals(1, files.length);
       Expect.isTrue(files[0].endsWith(x));
       Expect.equals(1, dirs.length);
       Expect.isTrue(dirs[0].endsWith(y));
       temp.deleteSync(recursive: true);
       temp2.deleteSync(recursive: true);
     };
   });
 }
 
 
 testDirectoryListingBrokenLink() {
   var temp = new Directory('').createTempSync();
   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, true, () {
+    Expect.throws(() => temp.listSync(recursive: true),
+                  (e) => e is DirectoryIOException);
     var files = [];
     var dirs = [];
     var errors = [];
     var lister = temp.list(recursive: true);
     lister.onFile = (f) => files.add(f);
     lister.onDir = (d) => dirs.add(d);
     lister.onError = (d) => errors.add(d);
     lister.onDone = (success) {
       Expect.isFalse(success);
       Expect.equals(1, files.length);
       Expect.isTrue(files[0].endsWith(x));
       Expect.equals(0, dirs.length);
       Expect.equals(1, errors.length);
       Expect.isTrue(errors[0].toString().contains(link));
       temp.deleteSync(recursive: true);
     };
   });
 }
 
 
 main() {
   testFileExistsCreate();
   testFileDelete();
   testFileWriteRead();
   testDirectoryExistsCreate();
   testDirectoryDelete();
   testDirectoryListing();
   testDirectoryListingBrokenLink();
 }