Replace the existing unittest APIs with the new runner infrastructure.

test/group_name_test.dart

Index: test/group_name_test.dart
diff --git a/test/group_name_test.dart b/test/group_name_test.dart
deleted file mode 100644
index 3184ffc3f8e954ce4c817bdcb5970f8c2a7878d2..0000000000000000000000000000000000000000
--- a/test/group_name_test.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-// 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.
-
-library unittest.group_name_test;
-
-import 'package:unittest/unittest.dart';
-
-import 'package:metatest/metatest.dart';
-
-void main() => initTests(_test);
-
-void _test(message) {
-  initMetatest(message);
-
-  expectTestResults('group name test', () {
-    group('a', () {
-      test('a', () {});
-      group('b', () {
-        test('b', () {});
-      });
-    });
-  }, [{'description': 'a a'}, {'description': 'a b b'}]);
-}