Fix for subscribing for notifications for files in packages.

pkg/analysis_server/test/services/completion/common_usage_computer_test.dart

 // Copyright (c) 2015, 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.services.completion.computer.dart.relevance;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_completion.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/common_usage_computer.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_cache.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../analysis_abstract.dart';
 import '../../mocks.dart';
 import '../../reflective_tests.dart';
+import 'package:analysis_server/src/analysis_server.dart' show ContextSourcePair;
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(CommonUsageComputerTest);
 }
 
 @reflectiveTest
 class CommonUsageComputerTest extends AbstractAnalysisTest {
   String completionId;
   int completionOffset;
@@ skipping 53 matching lines @@
   }
 
   Future getSuggestions(Map<String, List<String>> selectorRelevance) async {
     await waitForTasksFinished();
     CompletionGetSuggestionsParams params =
         new CompletionGetSuggestionsParams(testFile, completionOffset);
     Request request = params.toRequest('0');
     CompletionDomainHandler domainHandler = new CompletionDomainHandler(server);
     handler = domainHandler;
 
-    AnalysisContext context = server.getAnalysisContext(params.file);
-    Source source = server.getSource(params.file);
+    ContextSourcePair contextSource = server.getContextSourcePair(params.file);
+    AnalysisContext context = contextSource.context;
+    Source source = contextSource.source;
     DartCompletionManager completionManager = new DartCompletionManager(context,
         server.searchEngine, source, new DartCompletionCache(context, source),
         null, new CommonUsageComputer(selectorRelevance));
 
     Response response =
         domainHandler.processRequest(request, completionManager);
     expect(response, isResponseSuccess('0'));
     completionId = response.id;
     assertValidId(completionId);
     await pumpEventQueue();
@@ skipping 100 matching lines @@
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'nextBool');
     assertHasResult(CompletionSuggestionKind.INVOCATION,
         'nextDouble', DART_RELEVANCE_COMMON_USAGE - 1);
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'nextInt',
         DART_RELEVANCE_COMMON_USAGE);
     assertNoResult('Random');
     assertNoResult('Object');
     assertNoResult('A');
   }
 }