Create a new class for managing the set of analysis roots.

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 'package:analysis_server/src/context_directory_manager.dart';
+import 'package:analysis_server/src/resource.dart';
+import 'package:unittest/unittest.dart';
+
+class TestContextDirectoryManager extends ContextDirectoryManager {
+  TestContextDirectoryManager(MemoryResourceProvider provider) : super(provider);
+
+  final Set<String> currentContextPaths = new Set<String>();
+
+  @override
+  void addContext(Folder folder) {
+    currentContextPaths.add(folder.fullName);
+  }
+}
+
+main() {
+  groupSep = ' | ';
+
+  group('ContextDirectoryManager', () {
+    TestContextDirectoryManager manager;
+    MemoryResourceProvider provider;
+
+    setUp(() {
+      provider = new MemoryResourceProvider();
+      manager = new TestContextDirectoryManager(provider);
+    });
+
+    test('add folder with pubspec', () {
+      provider.newFile('/my/proj/pubspec.yaml', 'pubspec');
+      manager.setRoots(<String>['/my/proj'], <String>[]);
+      expect(manager.currentContextPaths, hasLength(1));
+      expect(manager.currentContextPaths, contains('/my/proj'));
+    });
+  });
+}