Use the new test runner.

test/transformer/prints_a_transform_interface_error_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';
 
 final transformer = """
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 
 class RewriteTransformer extends Transformer {
   RewriteTransformer.asPlugin();
 
   String get allowedExtensions => '.txt';
 }
 """;
 
 main() {
-  initConfig();
   withBarbackVersions("any", () {
     integration("prints a transform interface error", () {
       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();
       server.stderr.expect(emitsLines(
           "Build error:\n"
           "Transform Rewrite on myapp|web/foo.txt threw error: Class "
               "'RewriteTransformer' has no instance method 'apply'."));
       endPubServe();
     });
   });
 }