send status notification when analysis starts and ends

pkg/analysis_server/test/analysis_server_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.analysis_server;
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 32 matching lines @@
       AnalysisResult lastResult = new AnalysisResult(null, 1, '', 1);
       context.when(callsTo("performAnalysisTask"))
         ..thenReturn(firstResult, 3)
         ..thenReturn(lastResult);
       helper.server.schedulePerformAnalysisOperation(context);
       // Pump the event queue to make sure the server has finished any
       // analysis.
       return pumpEventQueue().then((_) {
         List<Notification> notifications = helper.channel.notificationsReceived;
         expect(notifications, isNot(isEmpty));
+        // expect at least one notification indicating analysis is in progress
+        expect(notifications.any((Notification notification) {
+          if (notification.event == SERVER_STATUS) {
+            Map analysisStatus = notification.params['analysis'];
+            return analysisStatus['analyzing'];
+          }
+          return false;
+        }), isTrue);
+        // the last notification should indicate that analysis is complete
         Notification notification = notifications[notifications.length - 1];
         Map analysisStatus = notification.params['analysis'];
         expect(analysisStatus['analyzing'], isFalse);
       });
     });
 
     test('echo', () {
       AnalysisServerTestHelper helper = new AnalysisServerTestHelper();
       helper.server.handlers = [new EchoHandler()];
       var request = new Request('my22', 'echo');
@@ skipping 46 matching lines @@
   @override
   Response handleRequest(Request request) {
     if (request.method == 'echo') {
       var response = new Response(request.id);
       response.setResult('echo', true);
       return response;
     }
     return null;
   }
 }