Add matchers for unit testing futures:

lib/unittest/unittest.dart

 // Copyright (c) 2011, 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.
 
 /**
  * A library for writing dart unit tests.
  *
  * To import this library, specify the relative path to
  * lib/unittest/unittest.dart.
  *
@@ skipping 125 matching lines @@
  */
 #library('unittest');
 
 #import('dart:isolate');
 
 #source('collection_matchers.dart');
 #source('config.dart');
 #source('core_matchers.dart');
 #source('description.dart');
 #source('expect.dart');
+#source('future_matchers.dart');
 #source('interfaces.dart');
 #source('map_matchers.dart');
 #source('matcher.dart');
 #source('numeric_matchers.dart');
 #source('operator_matchers.dart');
 #source('string_matchers.dart');
 #source('test_case.dart');
 
 /** [Configuration] used by the unittest library. */
 Configuration _config = null;
@@ skipping 448 matching lines @@
   }
   _config.onInit();
 
   // Immediately queue the suite up. It will run after a timeout (i.e. after
   // main() has returned).
   _defer(_runTests);
 }
 
 /** Signature for a test function. */
 typedef void TestFunction();