pkg/unittest: using matcher and mock from packages

pkg/unittest/lib/unittest.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.
 
 /**
  * Support for writing Dart unit tests.
  *
  * For information on installing and importing this library, see the
  * [unittest package on pub.dartlang.org]
  * (http://pub.dartlang.org/packages/unittest).
@@ skipping 132 matching lines @@
  * features or fixes to the current spec (e.g. see
  * [Issue 2706](http://dartbug.com/2706)).
  */
 library unittest;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:isolate';
 import 'package:stack_trace/stack_trace.dart';
 
-import 'matcher.dart';
-export 'matcher.dart';
+import 'package:matcher/matcher.dart' show DefaultFailureHandler,
+    configureExpectFailureHandler, TestFailure, wrapAsync;
+export 'package:matcher/matcher.dart';
 
 import 'src/utils.dart';
 
 part 'src/configuration.dart';
 part 'src/group_context.dart';
 part 'src/simple_configuration.dart';
 part 'src/spread_args_helper.dart';
 part 'src/test_case.dart';
 
 Configuration _config;
@@ skipping 569 matching lines @@
 
   if (!filterStacks) return trace;
 
   // Format the stack trace by removing everything above TestCase._runTest,
   // which is usually going to be irrelevant. Also fold together unittest and
   // core library calls so only the function the user called is visible.
   return new Trace(trace.frames.takeWhile((frame) {
     return frame.package != 'unittest' || frame.member != 'TestCase._runTest';
   })).terse.foldFrames((frame) => frame.package == 'unittest' || frame.isCore);
 }