Use the new test runner.

test/transformer/runs_a_transformer_group_test.dart

 // Copyright (c) 2013, 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("runs a transformer group", () {
       d.dir(appPath, [
         d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/group"]
         }),
         d.dir("lib", [d.dir("src", [
           d.file("transformer.dart", REWRITE_TRANSFORMER),
           d.file("group.dart", GROUP)
         ])]),
         d.dir("web", [
           d.file("foo.txt", "foo")
         ])
       ]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       pubServe();
       requestShouldSucceed("foo.out", "foo.out");
       endPubServe();
     });
   });
 }