Clean up unittest a bunch.

test/late_exception_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 unittest.late_exception_test;
 
 import 'dart:async';
 
 import 'package:metatest/metatest.dart';
 import 'package:unittest/unittest.dart';
 
 void main() => initTests(_test);
 
 void _test(message) {
   initMetatest(message);
 
   expectTestResults('late exception test', () {
     var f;
     test('testOne', () {
       f = expectAsync(() {});
       new Future.sync(f);
     });
     test('testTwo', () {
       new Future.sync(expectAsync(() {
         f();
       }));
     });
   }, [{
     'description': 'testOne',
-    'message': 'Callback called (2) after test case testOne has already been '
+    'message': 'Callback called (2) after test case testOne had already been '
         'marked as pass.',
     'result': 'error',
   }, {
     'description': 'testTwo',
     'result': 'pass',
   }]);
 }