Extract testing utilities into a separate package.

pkg/analysis_server/test/analysis_notification_highlights_test.dart

 // Copyright (c) 2014, 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.domain.analysis.notification.highlights;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
+import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart';
 
 import 'analysis_abstract.dart';
-import 'reflective_tests.dart';
 
 
 main() {
   group('notification.highlights', () {
     runReflectiveTests(AnalysisNotificationHighlightsTest);
   });
   group('HighlightType', () {
     runReflectiveTests(HighlightTypeTest);
   });
 }
@@ skipping 763 matching lines @@
     expect(HighlightType.CLASS, HighlightType.valueOf(
         HighlightType.CLASS.name));
   }
 
   void test_valueOf_unknown() {
     expect(() {
       HighlightType.valueOf('no-such-type');
     }, throws);
   }
 }