Upgrade to the new test runner.

test/windows_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 path.test.windows_test;
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 import 'package:path/path.dart' as path;
 
 import 'utils.dart';
 
 main() {
   var context =
       new path.Context(style: path.Style.windows, current: r'C:\root\path');
 
-  group('separator', () {

[Bob Nystrom, 2015/07/16 15:42:16]

Oops.

+  test('separator', () {
     expect(context.separator, '\\');
   });
 
   test('extension', () {
     expect(context.extension(''), '');
     expect(context.extension('.'), '');
     expect(context.extension('..'), '');
     expect(context.extension('a/..'), '');
     expect(context.extension('foo.dart'), '.dart');
     expect(context.extension('foo.dart.js'), '.js');
@@ skipping 640 matching lines @@
 
     test('with a root-relative URI', () {
       expect(context.prettyUri('/D:/a/b'), r'D:\a\b');
     });
 
     test('with a Uri object', () {
       expect(context.prettyUri(Uri.parse('a/b')), r'a\b');
     });
   });
 }