Upgrading tests with unittest deprecations

tests/html/isolates_test.dart

 library IsolatesTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:async';
 import 'dart:html';
 import 'dart:convert';
 import 'dart:isolate' as isolate;
 
 String responseFor(message) => 'response for $message';
 
@@ skipping 29 matching lines @@
 }
 
 main() {
   useHtmlConfiguration();
   test('IsolateSpawn', () {
     var port = new isolate.ReceivePort();
     isolate.Isolate.spawn(isolateEntry, port.sendPort);
     port.close();
   });
   test('NonDOMIsolates', () {
-    var callback = expectAsync0((){});
+    var callback = expectAsync((){});
     var response = new isolate.ReceivePort();
     var remote = isolate.Isolate.spawn(isolateEntry, response.sendPort);
     response.first.then((port) {
       final msg1 = 'foo';
       final msg2 = 'bar';
       sendReceive(port, msg1).then((response) {
         guardAsync(() {
           expect(response, equals(responseFor(msg1)));
           sendReceive(port, msg2).then((response) {
             guardAsync(() {
               expect(response, equals(responseFor(msg2)));
               callback();
             });
           });
         });
       });
     });
   });
 }