Speed up directory listing in pub.

sdk/lib/_internal/pub/test/io_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file

[nweiz, 2014/03/25 18:55:08]

Since we don't have a custom implementation of directory listing anymore, we
should probably get rid of all of these tests that don't explicitly test the
hidden-file behavior we add.

[Bob Nystrom, 2014/03/25 20:04:20]

I figured it doesn't hurt to have them as regression tests. But I can take them
out if you like.

[nweiz, 2014/03/25 20:14:12]

I'd rather avoid pub being in the position of being the regression test suite
for dart:io as much as possible.

[Bob Nystrom, 2014/03/26 00:51:38]

OK, done.

 // 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.
 
 library io_test;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
 import 'package:unittest/unittest.dart';
@@ skipping 96 matching lines @@
       }), completes);
     });
 
     test('works with recursive symlinks', () {
       expect(withTempDir((temp) {
         writeTextFile(path.join(temp, 'file1.txt'), '');
         createSymlink(temp, path.join(temp, 'linkdir'));
 
         expect(listDir(temp, recursive: true), unorderedEquals([
           path.join(temp, 'file1.txt'),
-          path.join(temp, 'linkdir')
+          path.join(temp, 'linkdir'),
+          // dart:io documents that recursive symlinks will cause entries to
+          // appear twice.
+          path.join(temp, 'linkdir/file1.txt'),
+          path.join(temp, 'linkdir/linkdir')
         ]));
       }), completes);
     });
 
     test('treats a broken symlink as a file', () {
       expect(withTempDir((temp) {
         writeTextFile(path.join(temp, 'file1.txt'), '');
         createDir(path.join(temp, 'dir'));
         createSymlink(path.join(temp, 'dir'), path.join(temp, 'linkdir'));
         deleteEntry(path.join(temp, 'dir'));
@@ skipping 294 matching lines @@
           expect(predicate(symlink2Path), equals(forMultiLevelFileSymlink));
         }), completes);
       });
     }
   });
 }
 
 /// Like [withTempDir], but canonicalizes the path before passing it to [fn].
 Future withCanonicalTempDir(Future fn(String path)) =>
   withTempDir((temp) => fn(canonicalize(temp)));