Add an option to run skipped tests.

lib/src/backend/declarer.dart

 // Copyright (c) 2015, 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:stack_trace/stack_trace.dart';
 
 import '../frontend/timeout.dart';
 import '../utils.dart';
@@ skipping 101 matching lines @@
   /// Creates a group of tests.
   void group(String name, void body(), {String testOn, Timeout timeout, skip,
       Map<String, dynamic> onPlatform, tags}) {
     _checkNotBuilt("group");
 
     var metadata = _metadata.merge(new Metadata.parse(
         testOn: testOn, timeout: timeout, skip: skip, onPlatform: onPlatform,
         tags: tags));
     var trace = new Trace.current(2);
 
-    // Don't load the tests for a skipped group.
-    if (metadata.skip) {
-      _entries.add(new Group(name, [], metadata: metadata, trace: trace));
-      return;
-    }
-
     var declarer = new Declarer._(this, _prefix(name), metadata, trace);
     declarer.declare(body);
     _entries.add(declarer.build());
   }
 
   /// Returns [name] prefixed with this declarer's group name.
   String _prefix(String name) => _name == null ? name : "$_name $name";
 
   /// Registers a function to be run before each test in this group.
   void setUp(callback()) {
@@ skipping 96 matching lines @@
     var completer = new Completer();
 
     Invoker.current.addOutstandingCallback();
     Invoker.current.waitForOutstandingCallbacks(() {
       new Future.sync(body).whenComplete(completer.complete);
     }).then((_) => Invoker.current.removeOutstandingCallback());
 
     return completer.future;
   }
 }