Add a testOn parameter to test() and group().

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 unittest.test.utils;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:unittest/src/backend/invoker.dart';
 import 'package:unittest/src/backend/live_test.dart';
+import 'package:unittest/src/backend/metadata.dart';
 import 'package:unittest/src/backend/state.dart';
 import 'package:unittest/src/backend/suite.dart';
 import 'package:unittest/src/runner/load_exception.dart';
 import 'package:unittest/src/util/remote_exception.dart';
 import 'package:unittest/unittest.dart';
 
 // The last state change detected via [expectStates].
 State lastState;
 
 /// Asserts that exactly [states] will be emitted via [liveTest.onStateChange].
@@ skipping 149 matching lines @@
   if (times == 0) return new Future.value();
   // Use [new Future] future to allow microtask events to finish. The [new
   // Future.value] constructor uses scheduleMicrotask itself and would therefore
   // not wait for microtask callbacks that are scheduled after invoking this
   // method.
   return new Future(() => pumpEventQueue(times - 1));
 }
 
 /// Returns a local [LiveTest] that runs [body].
 LiveTest createTest(body()) {
-  var test = new LocalTest("test", body);
+  var test = new LocalTest("test", new Metadata(), body);
   var suite = new Suite([test]);
   return test.load(suite);
 }
 
 /// Runs [body] as a test.
 ///
 /// Once it completes, returns the [LiveTest] used to run it.
 Future<LiveTest> runTest(body()) {
   var liveTest = createTest(body);
   return liveTest.run().then((_) => liveTest);
@@ skipping 40 matching lines @@
     });
   });
 
   return liveTest.run().then((_) {
     expectTestPassed(liveTest);
     // Ensure that the outer test doesn't complete until the inner future
     // completes.
     return future;
   });
 }