using unittest via package import

tests/html/element_types_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 element_types;
-import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_individual_config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlIndividualConfiguration();
 
   group('supported_content', () {
     test('supported', () {
       expect(ContentElement.supported, true);
     });
   });
@@ skipping 161 matching lines @@
       test('accepts li', () {
         var ul = new UListElement();
         var li = new LIElement();
         ul.append(li);
       });
     });
     check('video', () => new VideoElement() is VideoElement);
     check('unknown', () => new Element.tag('someunknown') is UnknownElement);
   });
 }