Sharing metatest logic between unittest and scheduled_test

pkg/scheduled_test/test/descriptor/async_test.dart

Index: pkg/scheduled_test/test/descriptor/async_test.dart
diff --git a/pkg/scheduled_test/test/descriptor/async_test.dart b/pkg/scheduled_test/test/descriptor/async_test.dart
index 8c1f80c75fde8cb9d374e45975df847f08b5497a..853ca55e9e15299ee655f3a690156f91f301adff 100644
--- a/pkg/scheduled_test/test/descriptor/async_test.dart
+++ b/pkg/scheduled_test/test/descriptor/async_test.dart
@@ -5,10 +5,12 @@
 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();