Add support for creating source ranges

pkg/analyzer_plugin/test/utilities/test_all.dart

 // Copyright (c) 2017, 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.
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'analyzer_converter_test.dart' as analyzer_converter_test;
+import 'range_factory_test.dart' as range_factory_test;
 import 'subscriptions/test_all.dart' as subscriptions;
 
 main() {
   defineReflectiveSuite(() {
     analyzer_converter_test.main();
+    range_factory_test.main();
     subscriptions.main();
   }, name: 'utilities');
 }