Fix for subscribing for notifications for files in packages.

pkg/analysis_server/test/domain_completion_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.completion;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/channel/channel.dart';
@@ skipping 174 matching lines @@
     });
   }
 
   /**
    * Assert manager is cleared when source NOT associated with manager is changed.
    */
   test_sourcesChanged_different_source_changed() {
     sendRequest(testFile);
     return pumpEventQueue().then((_) {
       expect(completionDomain.manager, isNotNull);
+      ContextSourcePair contextSource = server.getContextSourcePair(testFile2);
       ChangeSet changeSet = new ChangeSet();
-      changeSet.changedSource(server.getSource(testFile2));
+      changeSet.changedSource(contextSource.source);
       completionDomain.sourcesChanged(new SourcesChangedEvent(changeSet));
       expect(completionDomain.manager, isNull);
     });
   }
 
   /**
    * Assert manager is NOT cleared when source associated with manager is changed.
    */
   test_sourcesChanged_same_source_changed() {
     sendRequest(testFile);
@@ skipping 403 matching lines @@
 class Test_AnalysisServer extends AnalysisServer {
   final MockContext mockContext = new MockContext();
 
   Test_AnalysisServer(ServerCommunicationChannel channel,
       ResourceProvider resourceProvider, PackageMapProvider packageMapProvider,
       Index index, AnalysisServerOptions analysisServerOptions,
       DartSdk defaultSdk, InstrumentationService instrumentationService)
       : super(channel, resourceProvider, packageMapProvider, index,
           analysisServerOptions, defaultSdk, instrumentationService);
 
+  @override
   AnalysisContext getAnalysisContext(String path) {
     return mockContext;
   }
+
+  @override
+  ContextSourcePair getContextSourcePair(String path) {
+    ContextSourcePair pair = super.getContextSourcePair(path);
+    return new ContextSourcePair(mockContext, pair.source);
+  }
 }
 
 /**
  * A [CompletionDomainHandler] subclass that returns a mock completion manager
  * so that the domain handler cache management can be tested.
  */
 class Test_CompletionDomainHandler extends CompletionDomainHandler {
   Test_CompletionDomainHandler(Test_AnalysisServer server) : super(server);
 
   MockContext get mockContext => (server as Test_AnalysisServer).mockContext;
@@ skipping 33 matching lines @@
 }
     ''');
     await waitForTasksFinished();
     Request request =
         new CompletionGetSuggestionsParams(testFile, 0).toRequest('0');
     Response response = handler.handleRequest(request);
     expect(response.error, isNotNull);
     expect(response.error.code, RequestErrorCode.NO_INDEX_GENERATED);
   }
 }