Use the new test runner.

test/lock_file_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.
 
 library lock_file_test;
 
 import 'dart:async';
 
 import 'package:pub/src/lock_file.dart';
 import 'package:pub/src/package.dart';
 import 'package:pub/src/pubspec.dart';
 import 'package:pub/src/source.dart';
 import 'package:pub/src/source_registry.dart';
 import 'package:pub_semver/pub_semver.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 import 'package:yaml/yaml.dart';
 
 import 'test_pub.dart';
 
 class MockSource extends Source {
   final String name = 'mock';
 
   Future<Pubspec> doDescribe(PackageId id) => throw new UnsupportedError(
       "Cannot describe mock packages.");
 
@@ skipping 12 matching lines @@
   bool descriptionsEqual(description1, description2) =>
       description1 == description2;
 
   String packageName(String description) {
     // Strip off ' desc'.
     return description.substring(0, description.length - 5);
   }
 }
 
 main() {
-  initConfig();
-
   var sources = new SourceRegistry();
   var mockSource = new MockSource();
   sources.register(mockSource);
 
   group('LockFile', () {
     group('parse()', () {
       test('returns an empty lockfile if the contents are empty', () {
         var lockFile = new LockFile.parse('', sources);
         expect(lockFile.packages.length, equals(0));
       });
@@ skipping 160 matching lines @@
               'version': '3.2.1',
               'source': 'mock',
               'description': 'bar desc'
             }
           }
         }));
       });
     });
   });
 }