Very simple version of Isolates.

pkg/scheduled_test/test/scheduled_server_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.
 
 library scheduled_server_test;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:http/http.dart' as http;
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/src/mock_clock.dart' as mock_clock;
 
 import 'metatest.dart';
 import 'utils.dart';
 
-void main() {
+void main(List<String> args, message) {
+  initialMessage = message;
+
   setUpTimeout();
 
   expectTestsPass("a server with no handlers does nothing", () {
     test('test', () => new ScheduledServer());
   });
 
   expectTestsPass("a server with no handlers that receives a request throws an "
       "error", () {
     var errors;
     test('test 1', () {
@@ skipping 273 matching lines @@
       });
     });
 
     test('test 2', () {
       expect(errors.length, 2);
       expect(errors[0].error.toString(), equals('oh no'));
       expect(errors[1].error, new isInstanceOf<HttpException>());
     });
   }, passing: ['test 2']);
 }