Refactor groups to pipe them through to the runner.

test/utils.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.
 
 library test.test.utils;
 
 import 'dart:async';
 import 'dart:collection';
 
+import 'package:test/src/backend/declarer.dart';
 import 'package:test/src/backend/invoker.dart';
 import 'package:test/src/backend/live_test.dart';
 import 'package:test/src/backend/metadata.dart';
 import 'package:test/src/backend/state.dart';
 import 'package:test/src/backend/suite.dart';
 import 'package:test/src/runner/application_exception.dart';
 import 'package:test/src/runner/load_exception.dart';
 import 'package:test/src/util/remote_exception.dart';
 import 'package:test/test.dart';
 
@@ skipping 253 matching lines @@
       stopBlocking(value);
     });
   });
 
   await liveTest.run();
   expectTestPassed(liveTest);
   // Ensure that the outer test doesn't complete until the inner future
   // completes.
   return future;
 }
+
+/// Runs [body] with a declarer and returns the declared entries.
+List<SuiteEntry> declare(void body()) {
+  var declarer = new Declarer()..declare(body);
+  return declarer.build();
+}