Add a dedicated Result for skipped tests.

lib/src/runner/live_suite_controller.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:async';
 
 import 'package:async/async.dart' hide Result;
 import 'package:collection/collection.dart';
 
 import '../backend/state.dart';
@@ skipping 103 matching lines @@
 
     assert(liveTest.suite == _suite);
     assert(_active == null);
 
     _active = liveTest;
 
     liveTest.onStateChange.listen((state) {
       if (state.status != Status.complete) return;
       _active = null;
 
-      if (state.result != Result.success) {
+      if (state.result == Result.skipped) {
+        _skipped.add(liveTest);
+      } else if (state.result != Result.success) {
         _passed.remove(liveTest);
         _failed.add(liveTest);
-      } else if (liveTest.test.metadata.skip) {
-        _skipped.add(liveTest);
       } else if (countSuccess) {
         _passed.add(liveTest);
       }
     });
 
     _onTestStartedController.add(liveTest);
 
     _onCompleteGroup.add(liveTest.onComplete);
   }
 
   /// Indicates that all the live tests that are going to be provided for this
   /// suite have already been provided.
   void noMoreLiveTests() {
     _onTestStartedController.close();
     _onCompleteGroup.close();
   }
 
   /// Closes the underlying suite.
   Future close() => _closeMemo.runOnce(() async {
     try {
       await _suite.close();
     } finally {
       _onCloseCompleter.complete();
     }
   });
   final _closeMemo = new AsyncMemoizer();
 }