using unittest via package import

tests/html/htmlcollection_test.dart

 library ElementListTest;
-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';
 
 // Test that List<Element> implements List<T>
 main() {
   Element insertTestDiv() {
     Element element = new Element.tag('div');
     element.innerHtml = r"""
 <div id='allChecked'>
 <input type="checkbox" name="c1" value="1" checked="yes">
 <input type="checkbox" name="c2" value="2" checked="yes">
@@ skipping 254 matching lines @@
     expect(someChecked.lastIndexOf(someChecked[3], 2), -1);
 
     expect(someChecked.lastIndexOf(noneChecked[0], 3), -1);
     expect(noneChecked.lastIndexOf(someChecked[0], 3), -1);
     expect(someChecked.lastIndexOf(noneChecked[1], 3), -1);
     expect(noneChecked.lastIndexOf(someChecked[1], 3), -1);
 
     root.remove();
   });
 }