Sharing metatest logic between unittest and scheduled_test

pkg/unittest/test/excess_callback_test.dart

 // Copyright (c) 2013, 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 unittestTest;
+library unittest.excess_callback_test;
 
 import 'dart:async';
-import 'dart:isolate';
 
+import 'package:metatest/metatest.dart';
 import 'package:unittest/unittest.dart';
 
-part 'utils.dart';
+void main() => initTests(_test);
 
-var testName = 'excess callback test';
+void _test(message) {
+  initMetatest(message);
 
-var testFunction = (TestConfiguration testConfig) {
-  test(testName, () {
-    var _callback0 = expectAsync(() => ++testConfig.count);
-    var _callback1 = expectAsync(() => ++testConfig.count);
-    var _callback2 = expectAsync(() {
-      _callback1();
-      _callback1();
-      _callback0();
+  var count = 0;
+
+  expectTestResults('excess callback test', () {
+    test('test', () {
+      var _callback0 = expectAsync(() => ++count);
+      var _callback1 = expectAsync(() => ++count);
+      var _callback2 = expectAsync(() {
+        _callback1();
+        _callback1();
+        _callback0();
+      });
+      new Future.sync(_callback2);
     });
-    _defer(_callback2);
-  });
-};
 
-var expected = buildStatusString(0, 1, 0, testName,
-    count: 1, message: 'Callback called more times than expected (1).');
+    test('verify count', () {
+      expect(count, 1);
+    });
+  }, [{
+    'description': 'test',
+    'message': 'Callback called more times than expected (1).',
+    'result': 'fail'
+  }, {
+    'description': 'verify count',
+    'result': 'pass',
+  }]);
+}