Use the new test runner.

test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS 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 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:shelf/shelf.dart' as shelf;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 main() {
-  initConfig();
   integration('with no credentials.json, authenticates and saves '
       'credentials.json', () {
     d.validPackage.create();
 
     var server = new ScheduledServer();
     var pub = startPublish(server);
     confirmPublish(pub);
     authorizePub(pub, server);
 
     server.handle('GET', '/api/packages/versions/new', (request) {
       expect(request.headers,
           containsPair('authorization', 'Bearer access token'));
 
       return new shelf.Response(200);
     });
 
     // After we give pub an invalid response, it should crash. We wait for it to
     // do so rather than killing it so it'll write out the credentials file.
     pub.shouldExit(1);
 
     d.credentialsFile(server, 'access token').validate();
   });
 }