Use the new test runner.

test/dart2js/minify_configuration_overrides_mode_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.
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 main() {
-  initConfig();
   integration("minify configuration overrides the mode", () {
     d.dir(appPath, [
       d.pubspec({
         "name": "myapp",
         "transformers": [{
           "\$dart2js": {"minify": true}
         }]
       }),
       d.dir("web", [
         d.file("main.dart", "void main() => print('Hello!');")
       ])
     ]).create();
 
     pubServe();
     requestShouldSucceed("main.dart.js", isMinifiedDart2JSOutput);
     endPubServe();
   });
 }