using unittest via package import

tests/html/localstorage_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 LocalStorageTest;
-import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlConfiguration();
 
   void testWithLocalStorage(String name, fn()) {
     test(name, () {
       window.localStorage['key1'] = 'val1';
       window.localStorage['key2'] = 'val2';
       window.localStorage['key3'] = 'val3';
@@ skipping 81 matching lines @@
     window.localStorage.clear();
     expect(window.localStorage.length, 0);
   });
 
   testWithLocalStorage('isEmpty', () {
     expect(window.localStorage.isEmpty, isFalse);
     window.localStorage.clear();
     expect(window.localStorage.isEmpty, isTrue);
   });
 }