Use the new test runner.

test/transformer/exclusion/works_on_transformer_group_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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 pub_tests;
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 import '../../serve/utils.dart';
 
 const GROUP = """
 import 'package:barback/barback.dart';
 
 import 'transformer.dart';
 
 class RewriteGroup implements TransformerGroup {
   RewriteGroup.asPlugin();
 
   Iterable<Iterable> get phases => [[new RewriteTransformer.asPlugin()]];
 }
 """;
 
 main() {
-  initConfig();
   withBarbackVersions("any", () {
     integration("works on a transformer group", () {
       d.dir(appPath, [
         d.pubspec({
           "name": "myapp",
           "transformers": [
             {
               "myapp/src/group": {
                 "\$include": ["web/a.txt", "web/b.txt"],
                 "\$exclude": "web/a.txt"
@@ skipping 15 matching lines @@
       createLockFile('myapp', pkg: ['barback']);
 
       pubServe();
       requestShould404("a.out");
       requestShouldSucceed("b.out", "b.txt.out");
       requestShould404("c.out");
       endPubServe();
     });
   });
 }