pkg/unittest: test cleanup

pkg/unittest/test/protect_async_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;
+
+import 'dart:async';
 import 'dart:isolate';
-import 'dart:async';
+
 import 'package:unittest/unittest.dart';
 
-part 'unittest_test_utils.dart';
+part 'utils.dart';
 
 var testFunction = (_) {
   test('protectAsync0', () {
     var protected = () {
       throw new StateError('error during protectAsync0');
     };
     new Future(protected);
   });
 
   test('protectAsync1', () {
@@ skipping 13 matching lines @@
   test('throw away 1', () {
     return new Future(() {});
   });
 };
 
 var expected = '1:0:3:4:0:::null:'
   'protectAsync0:Caught Bad state: error during protectAsync0:'
   'protectAsync1:Caught Bad state: error during protectAsync1: one arg:'
   'protectAsync2:Caught Bad state: error during protectAsync2: arg1, arg2:'
   'throw away 1:';