Use the new test runner.

test/serve/does_not_serve_dart_in_release_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 'utils.dart';
 
 main() {
-  initConfig();
   integration("does not serve .dart files in release mode", () {
 
     d.dir("foo", [
       d.libPubspec("foo", "0.0.1"),
       d.dir("lib", [
         d.file("foo.dart",
             """
             library foo;
             foo() => 'foo';
             """)
@@ skipping 20 matching lines @@
     ]).create();
 
     pubServe(shouldGetFirst: true, args: ["--mode", "release"]);
     requestShould404("file.dart");
     requestShould404("packages/myapp/lib.dart");
     requestShould404("packages/foo/foo.dart");
     requestShould404("sub/sub.dart");
     endPubServe();
   });
 }