pkg/unittest: test cleanup

pkg/unittest/test/returning_future_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 testName = 'test returning future';
 
 var testFunction = (_) {
   test("successful", () {
     return _defer(() {
       expect(true, true);
     });
   });
   // We repeat the fail and error tests, because during development
@@ skipping 32 matching lines @@
   });
 };
 
 var expected = buildStatusString(2, 4, 0,
     'successful::'
     'error1:Callback called more times than expected (1).:'
     'fail1:Expected: <false> Actual: <true>:'
     'error2:Callback called more times than expected (1).:'
     'fail2:failure:'
     'foo5');