dart:io | Add asynchronous versions of the methods of FileSystemEntity and Link.

tests/standalone/io/windows_file_system_async_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:async";
+import 'package:expect/expect.dart';
+import "dart:io";
+import "dart:isolate";
+
+
+class FutureExpect {
+  static Future isTrue(Future<bool> result) =>
+      result.then((value) => Expect.isTrue(value));
+  static Future isFalse(Future<bool> result) =>
+      result.then((value) => Expect.isFalse(value));
+  static Future equals(expected, Future result) =>
+      result.then((value) => Expect.equals(expected, value));
+  static Future listEquals(expected, Future result) =>
+      result.then((value) => Expect.listEquals(expected, value));
+  static Future throws(Future result) =>
+      result.then((value) {
+        throw new ExpectException(
+            "FutureExpect.throws received $value instead of an exception");
+        }, onError: (_) => null);
+}
+
+
+Future testJunctionTypeDelete() {
+  return new Directory('').createTemp().then((temp) {
+    var x = '${temp.path}${Platform.pathSeparator}x';
+    var y = '${temp.path}${Platform.pathSeparator}y';
+    return new Directory(x).create()
+    .then((_) => new Link(y).create(x))
+    .then((_) => FutureExpect.isTrue(new Directory(y).exists()))
+    .then((_) => FutureExpect.isTrue(new Directory(x).exists()))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isLink(y)))
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isLink(x)))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isDirectory(y)))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isDirectory(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                  FileSystemEntity.type(y)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                  FileSystemEntity.type(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.LINK,
+                  FileSystemEntity.type(y, followLinks: false)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                  FileSystemEntity.type(x, followLinks: false)))
+    .then((_) => FutureExpect.equals(x, new Link(y).target()))
+
+    // Test Junction pointing to a missing directory.
+    .then((_) => new Directory(x).delete())
+    .then((_) => FutureExpect.isTrue(new Link(y).exists()))
+    .then((_) => FutureExpect.isFalse(new Directory(x).exists()))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isLink(y)))
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isLink(x)))
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isDirectory(y)))
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isDirectory(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.LINK,
+                                     FileSystemEntity.type(y)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                                     FileSystemEntity.type(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.LINK,
+                     FileSystemEntity.type(y, followLinks: false)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                     FileSystemEntity.type(x, followLinks: false)))
+    .then((_) => FutureExpect.equals(x, new Link(y).target()))
+
+    // Delete Junction pointing to a missing directory.
+    .then((_) => new Link(y).delete())
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isLink(y)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                  FileSystemEntity.type(y)))
+    .then((_) => FutureExpect.throws(new Link(y).target()))
+
+    .then((_) => new Directory(x).create())
+    .then((_) => new Link(y).create(x))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.LINK,
+                     FileSystemEntity.type(y, followLinks: false)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                     FileSystemEntity.type(x, followLinks: false)))
+    .then((_) => FutureExpect.equals(x, new Link(y).target()))
+
+    // Delete Junction pointing to an existing directory.
+    .then((_) => new Directory(y).delete())
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                                     FileSystemEntity.type(y)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                     FileSystemEntity.type(y, followLinks: false)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                                     FileSystemEntity.type(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                     FileSystemEntity.type(x, followLinks: false)))
+    .then((_) => FutureExpect.throws(new Link(y).target()))
+    .then((_) => temp.delete(recursive: true));
+  });
+}
+
+
+main() {
+  // Links on other platforms are tested by file_system_[async_]links_test.
+  if (Platform.operatingSystem == 'windows') {
+    ReceivePort keepAlive = new ReceivePort();
+    testJunctionTypeDelete().then((_) => keepAlive.close());
+  }
+}