Run file system operations in file_system_watcher_test after a runAsync delay.

tests/standalone/io/file_system_watcher_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 "dart:io";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 
@@ skipping 11 matching lines @@
         event.path.endsWith('file')) {
       asyncEnd();
       sub.cancel();
       dir.deleteSync(recursive: true);
     }
   }, onError: (e) {
     dir.deleteSync(recursive: true);
     throw e;
   });
 
-  file.createSync();
+  runAsync(file.createSync);
 }
 
 
 void testWatchModifyFile() {
   var dir = new Directory('').createTempSync();
   var file = new File(dir.path + '/file');
   file.createSync();
 
   var watcher = dir.watch();
 
   asyncStart();
   var sub;
   sub = watcher.listen((event) {
     if (event is FileSystemModifyEvent) {
       Expect.isTrue(event.path.endsWith('file'));
       sub.cancel();
       asyncEnd();
       dir.deleteSync(recursive: true);
     }
   }, onError: (e) {
     dir.deleteSync(recursive: true);
     throw e;
   });
 
-  file.writeAsStringSync('a');
+  runAsync(() => file.writeAsStringSync('a'));
 }
 
 
 void testWatchMoveFile() {
   var dir = new Directory('').createTempSync();
   var file = new File(dir.path + '/file');
   file.createSync();
 
   var watcher = dir.watch();
 
   asyncStart();
   var sub;
   sub = watcher.listen((event) {
     if (event is FileSystemMoveEvent) {
       Expect.isTrue(event.path.endsWith('file'));
       Expect.isTrue(event.destination.endsWith('file2'));
       sub.cancel();
       asyncEnd();
       dir.deleteSync(recursive: true);
     }
   }, onError: (e) {
     dir.deleteSync(recursive: true);
     throw e;
   });
 
-  file.renameSync(dir.path + '/file2');
+  runAsync(() => file.renameSync(dir.path + '/file2'));
 }
 
 
 void testWatchDeleteFile() {
   var dir = new Directory('').createTempSync();
   var file = new File(dir.path + '/file');
   file.createSync();
 
   var watcher = dir.watch();
 
   asyncStart();
   var sub;
   sub = watcher.listen((event) {
     if (event is FileSystemDeleteEvent) {
       Expect.isTrue(event.path.endsWith('file'));
       sub.cancel();
       asyncEnd();
       dir.deleteSync(recursive: true);
     }
   }, onError: (e) {
     dir.deleteSync(recursive: true);
     throw e;
   });
 
-  file.deleteSync();
+  runAsync(file.deleteSync);
 }
 
 
 void testWatchOnlyModifyFile() {
   var dir = new Directory('').createTempSync();
   var file = new File(dir.path + '/file');
 
   var watcher = dir.watch(events: FileSystemEvent.MODIFY);
 
   asyncStart();
   var sub;
   sub = watcher.listen((event) {
     Expect.isTrue(event is FileSystemModifyEvent);
     Expect.isTrue(event.path.endsWith('file'));
     sub.cancel();
     asyncEnd();
     dir.deleteSync(recursive: true);
   }, onError: (e) {
     dir.deleteSync(recursive: true);
     throw e;
   });
 
-  file.createSync();
-  file.writeAsStringSync('a');
+  runAsync(() {
+    file.createSync();
+    file.writeAsStringSync('a');
+  });
 }
 
 
 void testMultipleEvents() {
   var dir = new Directory('').createTempSync();
   var file = new File(dir.path + '/file');
   var file2 = new File(dir.path + '/file2');
 
   var watcher = dir.watch();
 
@@ skipping 53 matching lines @@
     if (event.path.endsWith('file')) {
       sub.cancel();
       asyncEnd();
       dir.deleteSync(recursive: true);
     }
   }, onError: (e) {
     dir.deleteSync(recursive: true);
     throw e;
   });
 
-  file.createSync();
+  runAsync(file.createSync());
 }
 
 
 void testWatchNonRecursive() {
   var dir = new Directory('').createTempSync();
   var dir2 = new Directory(dir.path + '/dir');
   dir2.createSync();
   var file = new File(dir.path + '/dir/file');
 
   var watcher = dir.watch(recursive: false);
 
   asyncStart();
   var sub;
   sub = watcher.listen((event) {
     if (event.path.endsWith('file')) {
       throw "File change event not expected";
     }
   }, onError: (e) {
     dir.deleteSync(recursive: true);
     throw e;
   });
 
-  file.createSync();
+  runAsync(file.createSync);
 
   new Timer(const Duration(milliseconds: 300), () {
     sub.cancel();
     asyncEnd();
     dir.deleteSync(recursive: true);
   });
 }
 
 
 void main() {
   if (!FileSystemEntity.isWatchSupported) return;
   testWatchCreateFile();
   testWatchModifyFile();
   testWatchMoveFile();
   testWatchDeleteFile();
   testWatchOnlyModifyFile();
   testMultipleEvents();
   testWatchNonRecursive();
 }