using unittest via package import

tests/html/event_customevent_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 EventCustomEventTest;
 
-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';
 import 'dart:js' as js;
 
 class DartPayloadData {
   final dartValue;
 
   DartPayloadData(this.dartValue);
 }
 
 main() {
@@ skipping 58 matching lines @@
     var event = new CustomEvent('dart_custom_data_event', detail: data);
 
     var future = window.on['dart_custom_data_event'].first.then((_) {
       expect(event.detail.dartValue, 666);
     });
 
     document.body.dispatchEvent(event);
     return future;
   });
 }