Upgrade to the new test runner.

test/browser_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.
 
+@TestOn('browser')
+
 import 'dart:html';
 
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
+import 'package:test/test.dart';
 import 'package:path/path.dart' as path;
 
 main() {
-  useHtmlConfiguration();
-
   group('new Context()', () {
     test('uses the window location if root and style are omitted', () {
       var context = new path.Context();
       expect(context.current,
           Uri.parse(window.location.href).resolve('.').toString());
     });
 
     test('uses "." if root is omitted', () {
       var context = new path.Context(style: path.Style.platform);
       expect(context.current, ".");
     });
 
     test('uses the host platform if style is omitted', () {
       var context = new path.Context();
       expect(context.style, path.Style.platform);
     });
   });
 
   test('Style.platform is url', () {
     expect(path.Style.platform, path.Style.url);
   });
 
   test('current', () {
     expect(
         path.current, Uri.parse(window.location.href).resolve('.').toString());
   });
 }