using unittest via package import

tests/html/domparser_test.dart

 library DOMParserTest;
-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 isDomParser = predicate((x) => x is DomParser, 'is a DomParser');
 
   test('constructorTest', () {
       var ctx = new DomParser();
       expect(ctx, isNotNull);
       expect(ctx, isDomParser);
   });
 }