dart:io | Add additional test of directory listing of broken links.

tests/standalone/io/link_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 "package:expect/expect.dart";
 import "dart:async";
 import "dart:io";
 import "dart:isolate";
 
 // Test the dart:io Link class.
@@ skipping 115 matching lines @@
           },
           onDone: () {
             for (var v in expected.values) {
               Expect.equals('Found', v);
             }
             f.complete(null);
           });
     }
   }
   Future.wait(futures).then((_) {
+    new Directory(target).deleteSync(recursive: true);
+    for (bool recursive in [true, false]) {
+      for (bool followLinks in [true, false]) {
+        var result = baseDir.listSync(recursive: recursive,
+                                      followLinks: followLinks);
+        Expect.equals(1, result.length);
+        Expect.isTrue(result[0] is Link);
+      }
+    }
     baseDir.deleteSync(recursive: true);
   });
 }
 
 testCreateLoopingLink() {
   Path base = new Path(new Directory('').createTempSync().path);
   new Directory.fromPath(base.append('a/b/c')).create(recursive: true)
   .then((_) =>
     new Link.fromPath(base.append('a/b/c/d'))
         .create(base.append('a/b').toNativePath()))
@@ skipping 15 matching lines @@
         .list(recursive: true, followLinks: true)
         .last)
   .then((_) =>
     new Directory.fromPath(base).delete(recursive: true));
 }
 
 main() {
   testCreateSync();
   testCreateLoopingLink();
 }