pkg/unittest: test cleanup

pkg/unittest/test/expect_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 = (TestConfiguration testConfig) {
   test('expectAsync zero params', () {
     _defer(expectAsync(() {
       ++testConfig.count;
     }));
   });
 
   test('expectAsync 1 param', () {
     var func = expectAsync((arg) {
@@ skipping 65 matching lines @@
     _defer(() => func(false, null));
   });
 };
 
 final expected = '8:0:0:8:8:::null:expectAsync zero params:'
     ':expectAsync 1 param::expectAsync 2 param:'
     ':single arg to Future.catchError::2 args to Future.catchError:'
     ':zero of two optional positional args:'
     ':one of two optional positional args:'
     ':two of two optional positional args:';