Use the new test runner.

test/version_solver_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 pub_upgrade_test;
 
 import 'dart:async';
 
 import 'package:pub/src/lock_file.dart';
 import 'package:pub/src/log.dart' as log;
 import 'package:pub/src/package.dart';
 import 'package:pub/src/pubspec.dart';
 import 'package:pub/src/sdk.dart' as sdk;
 import 'package:pub/src/solver/version_solver.dart';
 import 'package:pub/src/source/cached.dart';
 import 'package:pub/src/system_cache.dart';
 import 'package:pub/src/utils.dart';
 import 'package:pub_semver/pub_semver.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import 'test_pub.dart';
 
 MockSource source1;
 MockSource source2;
 
 main() {
-  initConfig();
-
   // Uncomment this to debug failing tests.
   // log.verbosity = log.Verbosity.SOLVER;
 
   // Since this test isn't run from the SDK, it can't find the "version" file
   // to load. Instead, just manually inject a version.
   sdk.version = new Version(1, 2, 3);
 
   group('basic graph', basicGraph);
   group('with lockfile', withLockFile);
   group('root dependency', rootDependency);
@@ skipping 1132 matching lines @@
     var realLockFile = new LockFile.empty();
     if (lockfile != null) {
       lockfile.forEach((name, version) {
         version = new Version.parse(version);
         realLockFile.packages[name] =
             new PackageId(name, source1.name, version, name);
       });
     }
 
     // Resolve the versions.
+    log.verbosity = log.Verbosity.NONE;
     var future = resolveVersions(
         downgrade ? SolveType.DOWNGRADE : SolveType.GET,
         cache.sources, root, lockFile: realLockFile);
 
     var matcher;
     if (result != null) {
       matcher = new SolveSuccessMatcher(result, maxTries);
     } else if (error != null) {
       matcher = error(maxTries);
     }
@@ skipping 342 matching lines @@
   }
 
   var source = "mock1";
   if (match[7] != null) {
     source = match[7];
     if (source == "root") source = null;
   }
 
   return new PackageId(name, source, parsedVersion, description);
 }