Use the new test runner.

test/upgrade/report/describes_change_test.dart

 // Copyright (c) 2013, 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.
 
 library pub_tests;
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
-  initConfig();
   integration("shows how package changed from previous lockfile", () {
     servePackages((builder) {
       builder.serve("unchanged", "1.0.0");
       builder.serve("version_changed", "1.0.0");
       builder.serve("version_changed", "2.0.0");
       builder.serve("source_changed", "1.0.0");
     });
 
     d.dir("source_changed", [
       d.libDir("source_changed"),
@@ skipping 31 matching lines @@
     // Upgrade everything.
     pubUpgrade(output: new RegExp(r"""
 Resolving dependencies\.\.\..*
 . description_changed 1\.0\.0 from path \.\.[/\\]description_changed_2 \(was 1\.0\.0 from path \.\.[/\\]description_changed_1\)
 . source_changed 2\.0\.0 from path \.\.[/\\]source_changed \(was 1\.0\.0\)
 . unchanged 1\.0\.0
 . version_changed 2\.0\.0 \(was 1\.0\.0\)
 """, multiLine: true));
   });
 }