Reorganize tests for samples so the test is discoverable from the sample

samples/dartcombat/test/dartcombat_test.dart

 // Copyright (c) 2011, 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 dartcombat_tests;
 
 import 'dart:html';
 import 'dart:isolate';
 import 'dart:async';
-import '../../../../pkg/unittest/lib/unittest.dart';
-import '../../../../pkg/unittest/lib/html_config.dart';
-import '../../../dartcombat/dartcombatlib.dart';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import '../dartcombatlib.dart';
 
 ReceivePort testPort;
 
 main() {
   useHtmlConfiguration();
   testPort = new ReceivePort();
 
   setupUI();
   // add relative URL to stylesheet to the correct location. Note: The CSS is
   // needed because the app uses a flexbox layout, which is then used to
@@ skipping 146 matching lines @@
     void invokeNext() {
       closures[i]();
       i++;
       if (i < length) {
         Timer.run(expectAsync0(invokeNext));
       }
     }
     Timer.run(expectAsync0(invokeNext));
   }
 }