Use the new test runner.

test/transformer/configuration/configuration_defaults_to_empty_map_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 'dart:convert';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
@@ skipping 16 matching lines @@
     return transform.primaryInput.readAsString().then((contents) {
       var id = transform.primaryInput.id.changeExtension(".json");
       transform.addOutput(
           new Asset.fromString(id, JSON.encode(settings.configuration)));
     });
   }
 }
 """;
 
 main() {
-  initConfig();
   withBarbackVersions("any", () {
     integration("configuration defaults to an empty map", () {
       d.dir(appPath, [
         d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/transformer"]
         }),
         d.dir("lib", [d.dir("src", [
           d.file("transformer.dart", transformer)
         ])]),
         d.dir("web", [
           d.file("foo.txt", "foo")
         ])
       ]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       var server = pubServe();
       requestShouldSucceed("foo.json", JSON.encode({}));
       endPubServe();
     });
   });
 }