using unittest via package import

tests/html/location_test.dart

 library LocationTest;
-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';
 
 main() {
   useHtmlConfiguration();
 
   var isLocation = predicate((x) => x is Location, 'is a Location');
 
   test('location hash', () {
       final location = window.location;
       expect(location, isLocation);
@@ skipping 10 matching lines @@
     // We build up the origin from Uri, then make sure that it matches.
     var uri = Uri.parse(window.location.href);
     var reconstructedOrigin = '${uri.scheme}://${uri.host}';
     if (uri.port != 0) {
       reconstructedOrigin = '$reconstructedOrigin:${uri.port}';
     }
 
     expect(origin, reconstructedOrigin);
   });
 }