Remove unused analysis contexts

pkg/analysis_server/test/context_directory_manager_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.context.directory.manager;
 
 import 'mocks.dart';
 import 'package:analysis_server/src/context_directory_manager.dart';
 import 'package:analysis_server/src/resource.dart';
 import 'package:path/path.dart';
 import 'package:unittest/unittest.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 class TestContextDirectoryManager extends ContextDirectoryManager {
   TestContextDirectoryManager(MemoryResourceProvider provider) : super(provider);
 
   final Set<String> currentContextPaths = new Set<String>();
   final Map<String, String> currentContextPubspecPaths = <String, String>{};
   final Map<String, Set<String>> currentContextFilePaths = <String, Set<String>>{};
 
   @override
   void addContext(Folder folder, File pubspecFile) {
-    currentContextPaths.add(folder.path);
-    currentContextPubspecPaths[folder.path] = pubspecFile != null ? pubspecFile.path : null;
-    currentContextFilePaths[folder.path] = new Set<String>();
+    String path = folder.path;
+    currentContextPaths.add(path);
+    currentContextPubspecPaths[path] = pubspecFile != null ? pubspecFile.path : null;
+    currentContextFilePaths[path] = new Set<String>();
   }
 
   @override
   void applyChangesToContext(Folder contextFolder, ChangeSet changeSet) {
     Set<String> filePaths = currentContextFilePaths[contextFolder.path];
     for (Source source in changeSet.addedSources) {
       expect(filePaths, isNot(contains(source.fullName)));
       filePaths.add(source.fullName);
     }
     for (Source source in changeSet.removedSources) {
       expect(filePaths, contains(source.fullName));
       filePaths.remove(source.fullName);
     }
     // TODO(paulberry): handle source.changedSources.
   }
+
+  @override
+  void removeContext(Folder folder) {
+    String path = folder.path;
+    currentContextPaths.remove(path);
+    currentContextPubspecPaths.remove(path);
+    currentContextFilePaths.remove(path);
+  }
 }
 
 main() {
   groupSep = ' | ';
 
   group('ContextDirectoryManager', () {
     TestContextDirectoryManager manager;
     MemoryResourceProvider provider;
 
     setUp(() {
@@ skipping 100 matching lines @@
         manager.setRoots(<String>[projPath], <String>[]);
         Set<String> filePaths = manager.currentContextFilePaths[projPath];
         expect(filePaths, hasLength(1));
         expect(filePaths, contains(filePath));
         provider.deleteFile(filePath);
         return pumpEventQueue().then((_) => expect(filePaths, hasLength(0)));
       });
     });
   });
 }