using unittest via package import

tests/html/rtc_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.
 
 library RealTimeCommunicationTest;
-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(RtcPeerConnection.supported, true);
     });
   });
@@ skipping 22 matching lines @@
       });
 
       test('session description', () {
         var description = new RtcSessionDescription({'sdp': 'foo',
                                                      'type': 'offer'});
         expect(description is RtcSessionDescription, isTrue);
       });
     }
   });
 }