Only send "analysis.analyzedFiles" notification when the set of files changes.

pkg/analysis_server/test/analysis_abstract.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.abstract;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
@@ skipping 138 matching lines @@
     return testFile;
   }
 
   void processNotification(Notification notification) {
     if (notification.event == SERVER_ERROR) {
       var params = new ServerErrorParams.fromNotification(notification);
       serverErrors.add(params);
     }
   }
 
+  void removeGeneralAnalysisSubscription(GeneralAnalysisService service) {
+    generalServices.remove(service);
+    Request request = new AnalysisSetGeneralSubscriptionsParams(generalServices)
+        .toRequest('0');
+    handleSuccessfulRequest(request);
+  }
+
   void setUp() {
     serverChannel = new MockServerChannel();
     resourceProvider = new MemoryResourceProvider();
     packageMapProvider = new MockPackageMapProvider();
     Index index = createIndex();
     server = createAnalysisServer(index);
     handler = new AnalysisDomainHandler(server);
     // listen for notifications
     Stream<Notification> notificationStream =
         serverChannel.notificationController.stream;
@@ skipping 18 matching lines @@
   }
 
   /**
    * Completes with a successful [Response] for the given [request].
    * Otherwise fails.
    */
   Future<Response> waitResponse(Request request) async {
     return serverChannel.sendRequest(request);
   }
 }