using unittest via package import

tests/html/shadow_dom_test.dart

 // Copyright (c) 2011, 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 ShadowDOMTest;
-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', () {
     test('supported', () {
       expect(ShadowRoot.supported, true);
     });
   });
@@ skipping 68 matching lines @@
 
         var content2 = new ContentElement();
         sRoot.append(content2);
 
         expect(content1.getDistributedNodes(), [box1]);
         expect(content2.getDistributedNodes(), [box2]);
       });
     }
   });
 }