Sharing metatest logic between unittest and scheduled_test

pkg/scheduled_test/test/descriptor/directory_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 'dart:async';
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
 import 'package:scheduled_test/descriptor.dart' as d;
 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("directory().create() creates a directory and its contents",
       () {
     test('test', () {
       scheduleSandbox();
 
       d.dir('dir', [
@@ skipping 405 matching lines @@
         isDirectoryDescriptor('subdir', [
           isFileDescriptor('subfile1.txt', 'subcontents1'),
           isFileDescriptor('subfile2.txt', 'subcontents2')
         ]),
         isFileDescriptor('file1.txt', 'contents1'),
         isFileDescriptor('file2.txt', 'contents2')
       ]));
     });
   });
 }