Upgrading tests with unittest deprecations

tests/isolate/message2_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.
 
 // Dart test program for testing serialization of messages.
 // VMOptions=--enable_type_checks --enable_asserts
 
 library Message2Test;
 import 'dart:isolate';
 import 'package:unittest/unittest.dart';
@@ skipping 43 matching lines @@
     }
   });
   replyPort.send(port.sendPort);
 }
 
 void main([args, port]) {
   if (testRemote(main, port)) return;
   test("map is equal after it is sent back and forth", () {
     ReceivePort port = new ReceivePort();
     Isolate.spawn(pingPong, port.sendPort);
-    port.first.then(expectAsync1((remote) {
+    port.first.then(expectAsync((remote) {
       Map m = new Map();
       m[1] = "eins";
       m[2] = "deux";
       m[3] = "tre";
       m[4] = "four";
       ReceivePort replyPort = new ReceivePort();
       remote.send([m, replyPort.sendPort]);
-      replyPort.first.then(expectAsync1((var received) {
+      replyPort.first.then(expectAsync((var received) {
         MessageTest.mapEqualsDeep(m, received);
         remote.send(null);
       }));
     }));
   });
 }