Very simple version of Isolates.

pkg/scheduled_test/test/descriptor/pattern_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 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../metatest.dart';
 import 'utils.dart';
 
 String sandbox;
 
-void main() {
+void main(List<String> args, message) {
+  initialMessage = message;
+
   setUpTimeout();
 
   expectTestsPass("pattern().validate() succeeds if there's a file matching "
       "the pattern and the child entry", () {
     test('test', () {
       scheduleSandbox();
 
       d.file('foo', 'blap').create();
 
       d.filePattern(new RegExp(r'f..'), 'blap').validate();
@@ skipping 128 matching lines @@
       expect(errors.single, new isInstanceOf<ScheduleError>());
       expect(errors.single.error.toString(), matches(
           r"^Multiple valid entries found in '[^']+' matching "
           r"\/f\.\./:\n"
           r"\* faa\n"
           r"\* fee\n"
           r"\* foo$"));
     });
   }, passing: ['test 2']);
 }