Hook for overriding the ContextManager and some code clean-up (with more to follow)

pkg/analysis_server/test/domain_execution_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.execution;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
@@ skipping 212 matching lines @@
       when(context.librarySources).thenReturn([source4]);
       when(context.htmlSources).thenReturn([source5]);
       when(context.getLibrariesReferencedFromHtml(anyObject))
           .thenReturn([source6, source7]);
 
       ServerContextManager manager = new ServerContextManagerMock();
       when(manager.isInAnalysisRoot(anyString)).thenReturn(true);
 
       AnalysisServer server = new AnalysisServerMock();
       when(server.getAnalysisContexts()).thenReturn([context]);
-      when(server.contextDirectoryManager).thenReturn(manager);
+      when(server.contextManager).thenReturn(manager);
 
       StreamController controller = new StreamController.broadcast(sync: true);
       when(server.onFileAnalyzed).thenReturn(controller.stream);
 
       List<String> unsentNotifications = <String>[
         source1.fullName,
         source2.fullName,
         source3.fullName,
         source4.fullName,
         source5.fullName
@@ skipping 71 matching lines @@
  * A [Source] that knows it's [fullName].
  */
 class TestSource implements Source {
   String fullName;
 
   TestSource(this.fullName);
 
   @override
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }