using unittest via package import

tests/html/history_test.dart

 library HistoryTest;
-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';
 import 'dart:async';
 
 main() {
   useHtmlIndividualConfiguration();
 
   group('supported_state', () {
     test('supportsState', () {
       expect(History.supportsState, true);
     });
@@ skipping 61 matching lines @@
       var expectation = HashChangeEvent.supported ? returnsNormally : throws;
       expect(() {
         var event = new HashChangeEvent('change', oldUrl:'old', newUrl: 'new');
         expect(event is HashChangeEvent, true);
         expect(event.oldUrl, 'old');
         expect(event.newUrl, 'new');
       }, expectation);
     });
   });
 }