Add support for adding/removing pubspec.yaml files.

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';
@@ skipping 171 matching lines @@
         Map<String, int> filePaths = manager.currentContextFilePaths[projPath];
         expect(filePaths, hasLength(0));
         String filePath = posix.join(projPath, 'foo', 'bar.dart');
         provider.newFile(filePath, 'contents');
         return pumpEventQueue().then((_) {
           expect(filePaths, hasLength(1));
           expect(filePaths, contains(filePath));
         });
       });
 
+      test('Add pubspec file', () {
+        manager.setRoots(<String>[projPath], <String>[]);
+        String pubspecPath = posix.join(projPath, 'pubspec.yaml');
+        expect(manager.currentContextPubspecPaths[projPath], isNull);
+        provider.newFile(pubspecPath, 'pubspec');
+        return pumpEventQueue().then((_) {
+          expect(manager.currentContextPubspecPaths[projPath], equals(pubspecPath));
+        });
+      });
+
       test('Delete file', () {
         String filePath = posix.join(projPath, 'foo.dart');
         provider.newFile(filePath, 'contents');
         manager.setRoots(<String>[projPath], <String>[]);
         Map<String, int> filePaths = manager.currentContextFilePaths[projPath];
         expect(filePaths, hasLength(1));
         expect(filePaths, contains(filePath));
         provider.deleteFile(filePath);
         return pumpEventQueue().then((_) => expect(filePaths, hasLength(0)));
       });
 
+      test('Delete pubspec file', () {
+        String pubspecPath = posix.join(projPath, 'pubspec.yaml');
+        provider.newFile(pubspecPath, 'pubspec');
+        manager.setRoots(<String>[projPath], <String>[]);
+        expect(manager.currentContextPubspecPaths[projPath], equals(pubspecPath));
+        provider.deleteFile(pubspecPath);
+        return pumpEventQueue().then((_) {
+          expect(manager.currentContextPubspecPaths[projPath], isNull);
+        });
+      });
+
       test('Modify file', () {
         String filePath = posix.join(projPath, 'foo.dart');
         provider.newFile(filePath, 'contents');
         manager.setRoots(<String>[projPath], <String>[]);
         Map<String, int> filePaths = manager.currentContextFilePaths[projPath];
         expect(filePaths, hasLength(1));
         expect(filePaths, contains(filePath));
         expect(filePaths[filePath], equals(manager.now));
         manager.now++;
         provider.modifyFile(filePath, 'new contents');
         return pumpEventQueue().then((_) => expect(filePaths[filePath], equals(
             manager.now)));
       });
     });
   });
 }