Sharing metatest logic between unittest and scheduled_test

pkg/scheduled_test/test/scheduled_test/on_exception_test.dart

Index: pkg/scheduled_test/test/scheduled_test/on_exception_test.dart
diff --git a/pkg/scheduled_test/test/scheduled_test/on_exception_test.dart b/pkg/scheduled_test/test/scheduled_test/on_exception_test.dart
index 5e456135e9efa64f46b37b5bcf83dc4c616c8909..6f1d148f25e10530755ded1aa16f8514d84915f2 100644
--- a/pkg/scheduled_test/test/scheduled_test/on_exception_test.dart
+++ b/pkg/scheduled_test/test/scheduled_test/on_exception_test.dart
@@ -4,10 +4,12 @@
 
 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();