Upgrading tests with unittest deprecations

tests/isolate/count_test.dart

 // 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.
 
 library CountTest;
 import 'dart:isolate';
 import 'package:unittest/unittest.dart';
 import "remote_unittest_helper.dart";
 
 void countMessages(replyTo) {
@@ skipping 13 matching lines @@
   });
 }
 
 void main([args, port]) {
   if (testRemote(main, port)) return;
   test("count 10 consecutive messages", () {
     ReceivePort local = new ReceivePort();
     Isolate.spawn(countMessages, local.sendPort);
     SendPort remote;
     int count = 0;
-    var done = expectAsync0((){});
+    var done = expectAsync((){});
     local.listen((msg) {
       switch (msg[0]) {
         case "init":
           expect(remote, null);
           remote = msg[1];
           remote.send(++count);
           break;
         case "count":
           expect(msg[1], count * 2);
           if (count == 10) {
             remote.send(-1);
           } else {
             remote.send(++count);
           }
           break;
         case "done":
           expect(count, 10);
           local.close();
           done();
           break;
         default:
           fail("unreachable: ${msg[0]}");
       }
     });
   });
 }