Ignore contexts in folders named 'packages' or starting with dot.

pkg/analysis_server/test/context_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 'dart:collection';
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 919 matching lines @@
   void test_setRoots_newlyAddedFoldersGetProperPackageMap() {
     String packagePath = '/package/foo';
     Folder packageFolder = resourceProvider.newFolder(packagePath);
     packageMapProvider.packageMap = {
       'foo': [packageFolder]
     };
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     _checkPackageMap(projPath, equals(packageMapProvider.packageMap));
   }
 
+  void test_setRoots_noContext_inDotFolder() {
+    String pubspecPath = posix.join(projPath, '.pub', 'pubspec.yaml');
+    resourceProvider.newFile(pubspecPath, 'name: test');
+    manager.setRoots(<String>[projPath], <String>[], <String, String>{});
+    // verify
+    expect(callbacks.currentContextPaths, hasLength(1));
+    expect(callbacks.currentContextPaths, contains(projPath));
+    expect(callbacks.currentContextFilePaths[projPath], hasLength(0));
+  }
+
+  void test_setRoots_noContext_inPackagesFolder() {
+    String pubspecPath = posix.join(projPath, 'packages', 'pubspec.yaml');
+    resourceProvider.newFile(pubspecPath, 'name: test');
+    manager.setRoots(<String>[projPath], <String>[], <String, String>{});
+    // verify
+    expect(callbacks.currentContextPaths, hasLength(1));
+    expect(callbacks.currentContextPaths, contains(projPath));
+    expect(callbacks.currentContextFilePaths[projPath], hasLength(0));
+  }
+
   void test_setRoots_packageResolver() {
     Uri uri = Uri.parse('package:foo/foo.dart');
     Source source = new TestSource();
     packageResolver = new TestUriResolver({uri: source});
     String filePath = posix.join(projPath, 'foo.dart');
     resourceProvider.newFile(filePath, 'contents');
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
 
     List<AnalysisContext> contextsInAnalysisRoot =
         manager.contextsInAnalysisRoot(resourceProvider.newFolder(projPath));
@@ skipping 864 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }