Sharing metatest logic between unittest and scheduled_test

pkg/scheduled_test/test/scheduled_test/tear_down_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/scheduled_test.dart';
 
-import '../metatest.dart';
+import 'package:metatest/metatest.dart';
 import '../utils.dart';
 
-void main(_, message) {
+void main() => initTests(_test);
+
+void _test(message) {
   initMetatest(message);
 
   setUpTimeout();
 
   expectTestsPass('tearDown is run synchronously after each test', () {
     var tearDownRun = false;
     tearDown(() {
       tearDownRun = true;
       schedule(() => tearDownRun = false);
     });
@@ skipping 173 matching lines @@
   expectTestsPass("a future returned by tearDown should not block the schedule",
       () {
     var futureComplete = false;
     tearDown(() => pumpEventQueue().then((_) => futureComplete = true));
 
     test('test', () {
       schedule(() => expect(futureComplete, isFalse));
     });
   });
 }