pkg/scheduled_test: fix analyzer hints

test/utils.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 test_utils;
 
 import 'dart:async';
 
 import 'package:scheduled_test/scheduled_test.dart';
-import 'package:scheduled_test/src/utils.dart';
 import 'package:test/test.dart' as test_pkg;
 
 import 'package:metatest/metatest.dart';
 
 export 'package:scheduled_test/src/utils.dart';
 
 import 'mock_clock.dart';
 
 /// A matcher that validates whether an object is a [TestFailure].
 final isTestFailure = new isInstanceOf<TestFailure>();
@@ skipping 45 matching lines @@
 
 /// Like [expectTestFails], but expects there to be only a single error and
 /// unwraps that error before passing it to [validator].
 void expectTestFailure(String description, Future testBody(),
     void validator(error))  {
   expectTestFails(description, testBody, (errors) {
     expect(errors, hasLength(1));
     validator(errors.single.error);
   });
 }