Use the new test runner.

test/get/path/path_is_file_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 d.file.
 
 import 'package:path/path.dart' as path;
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
-  initConfig();
   integration('path dependency when path is a file', () {
     d.dir('foo', [
       d.libDir('foo'),
       d.libPubspec('foo', '0.0.1')
     ]).create();
 
     d.file('dummy.txt', '').create();
     var dummyPath = path.join(sandboxDir, 'dummy.txt');
 
     d.dir(appPath, [
       d.appPubspec({
         "foo": {"path": dummyPath}
       })
     ]).create();
 
     pubGet(error: 'Path dependency for package foo must refer to a '
                   'directory, not a file. Was "$dummyPath".');
   });
 }