Get rid of ContextManager._contexts.

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 78 matching lines @@
     callbacks = new TestContextManagerCallbacks();
     manager.callbacks = callbacks;
     resourceProvider.newFolder(projPath);
     ContextManagerImpl.ENABLE_PACKAGESPEC_SUPPORT = true;
   }
 
   void tearDown() {
     ContextManagerImpl.ENABLE_PACKAGESPEC_SUPPORT = false;
   }
 
+  void test_contextsInAnalysisRoot_nestedContext() {
+    String subProjPath = join(projPath, 'subproj');
+    Folder subProjFolder = resourceProvider.newFolder(subProjPath);
+    resourceProvider.newFile(join(subProjPath, 'pubspec.yaml'), 'contents');
+    String subProjFilePath = join(subProjPath, 'file.dart');
+    resourceProvider.newFile(subProjFilePath, 'contents');
+    manager.setRoots(<String>[projPath], <String>[], <String, String>{});
+    // Make sure that there really are contexts for both the main project and
+    // the subproject.
+    Folder projFolder = resourceProvider.getFolder(projPath);
+    ContextInfo projContextInfo = manager.getContextInfoFor(projFolder);
+    expect(projContextInfo, isNotNull);
+    expect(projContextInfo.folder, projFolder);
+    ContextInfo subProjContextInfo = manager.getContextInfoFor(subProjFolder);
+    expect(subProjContextInfo, isNotNull);
+    expect(subProjContextInfo.folder, subProjFolder);
+    expect(projContextInfo.context != subProjContextInfo.context, isTrue);
+    // Check that contextsInAnalysisRoot() works.
+    List<AnalysisContext> contexts = manager.contextsInAnalysisRoot(projFolder);
+    expect(contexts.length, 2);
+    expect(contexts, contains(projContextInfo.context));
+    expect(contexts, contains(subProjContextInfo.context));
+  }
+
   test_ignoreFilesInPackagesFolder() {
     // create a context with a pubspec.yaml file
     String pubspecPath = posix.join(projPath, 'pubspec.yaml');
     resourceProvider.newFile(pubspecPath, 'pubspec');
     // create a file in the "packages" folder
     String filePath1 = posix.join(projPath, 'packages', 'file1.dart');
     resourceProvider.newFile(filePath1, 'contents');
     // "packages" files are ignored initially
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     expect(callbacks.currentContextFilePaths[projPath], isEmpty);
@@ skipping 11 matching lines @@
     String excludedFolder = '$project/excluded';
     // set roots
     resourceProvider.newFolder(project);
     resourceProvider.newFolder(excludedFolder);
     manager.setRoots(
         <String>[project], <String>[excludedFolder], <String, String>{});
     // verify
     expect(manager.isInAnalysisRoot('$excludedFolder/test.dart'), isFalse);
   }
 
+  void test_isInAnalysisRoot_inNestedContext() {
+    String subProjPath = join(projPath, 'subproj');
+    Folder subProjFolder = resourceProvider.newFolder(subProjPath);
+    resourceProvider.newFile(join(subProjPath, 'pubspec.yaml'), 'contents');
+    String subProjFilePath = join(subProjPath, 'file.dart');
+    resourceProvider.newFile(subProjFilePath, 'contents');
+    manager.setRoots(<String>[projPath], <String>[], <String, String>{});
+    // Make sure that there really is a context for the subproject.
+    ContextInfo subProjContextInfo = manager.getContextInfoFor(subProjFolder);
+    expect(subProjContextInfo, isNotNull);
+    expect(subProjContextInfo.folder, subProjFolder);
+    // Check that isInAnalysisRoot() works.
+    expect(manager.isInAnalysisRoot(subProjFilePath), isTrue);
+  }
+
   void test_isInAnalysisRoot_inRoot() {
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     expect(manager.isInAnalysisRoot('$projPath/test.dart'), isTrue);
   }
 
   void test_isInAnalysisRoot_notInRoot() {
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     expect(manager.isInAnalysisRoot('/test.dart'), isFalse);
   }
 
@@ skipping 1422 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }