Make multi-test less strict, to avoid oddly-delayed errors on Windows.

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 126 matching lines @@
   var dir = new Directory('').createTempSync();
   var file = new File(dir.path + '/file');
   var file2 = new File(dir.path + '/file2');
 
   var watcher = dir.watch();
 
   asyncStart();
   int state = 0;
   var sub;
   sub = watcher.listen((event) {
-    switch (state) {
-      case 0:
-        Expect.isTrue(event is FileSystemCreateEvent);
-        state = 1;
+    int newState = 0;
+    switch (event.type) {
+      case FileSystemEvent.CREATE:
+        newState = 1;
         break;
 
-      case 1:
-        if (event is FileSystemCreateEvent) break;
-        Expect.isTrue(event is FileSystemModifyEvent);
-        state = 2;
+      case FileSystemEvent.MODIFY:
+        newState = 2;
         break;
 
-      case 2:
-        if (event is FileSystemModifyEvent) break;
-        Expect.isTrue(event is FileSystemMoveEvent);
-        state = 3;
+      case FileSystemEvent.MOVE:
+        newState = 3;
         break;
 
-      case 3:
-        if (event is FileSystemMoveEvent) break;
-        Expect.isTrue(event is FileSystemDeleteEvent);
+      case FileSystemEvent.DELETE:
+        newState = 4;
         sub.cancel();
         asyncEnd();
         dir.deleteSync();
         break;
     }
+    if (newState < state) throw "Bad state";
+    state = newState;
   });
 
-  file.createSync();
-  file.writeAsStringSync('a');
-  file.renameSync(file2.path);
-  file2.deleteSync();
+  runAsync(() {
+    file.createSync();
+    file.writeAsStringSync('a');
+    file.renameSync(file2.path);
+    file2.deleteSync();
+  });
 }
 
 
 void testWatchRecursive() {
   var dir = new Directory('').createTempSync();
   if (Platform.isLinux) {
     Expect.throws(() => dir.watch(recursive: true));
     return;
   }
   var dir2 = new Directory(dir.path + '/dir');
@@ skipping 50 matching lines @@
 
 void main() {
   testWatchCreateFile();
   testWatchModifyFile();
   testWatchMoveFile();
   testWatchDeleteFile();
   testWatchOnlyModifyFile();
   testMultipleEvents();
   testWatchNonRecursive();
 }