Implement recursive directory deletion.

tests/standalone/src/DirectoryTest.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 //
 // Directory listing test.
 
 #import("dart:io");
 
 class DirectoryTest {
   static void testListing() {
     bool listedDir = false;
@@ skipping 16 matching lines @@
     directory.fileHandler = (f) {
       listedFile = true;
       Expect.isTrue(f.contains('subdir'));
       Expect.isTrue(f.contains('file.txt'));
     };
 
     directory.doneHandler = (completed) {
       Expect.isTrue(completed, "directory listing did not complete");
       Expect.isTrue(listedDir, "directory not found");
       Expect.isTrue(listedFile, "file not found");
-      f.deleteHandler = () {
-        // TODO(ager): use async directory deletion API when available.
-        subDirectory.deleteSync();
-        directory.deleteSync();
+      directory.delete(recursive: true);

[Bill Hesse, 2012/02/02 17:24:39]

I think we need some major tests for the new recursive delete.

[Mads Ager (google), 2012/02/03 11:48:54]

I have added some more tests. It is hard to do more than test a couple of error
conditions such as non-existent directory and long path names.

+      directory.deleteHandler = () {
+        f.exists();
+        f.existsHandler = (exists) => Expect.isFalse(exists);
+        directory.exists();
+        directory.existsHandler = (exists) => Expect.isFalse(exists);
+        subDirectory.exists();
+        subDirectory.existsHandler = (exists) => Expect.isFalse(exists);
       };
-      f.delete();
     };
 
     directory.errorHandler = (error) {
       Expect.fail("error listing directory: $error");
     };
 
     directory.list(recursive: true);
 
     // Listing is asynchronous, so nothing should be listed at this
     // point.
@@ skipping 245 matching lines @@
   dir.createTemp();
 }
 
 
 main() {
   DirectoryTest.testMain();
   NestedTempDirectoryTest.testMain();
   testCreateTempErrorSync();
   testCreateTempError();
 }