We don't use path filter in SingleContextManager.

pkg/analysis_server/test/single_context_manager_test.dart

 // Copyright (c) 2016, 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.analysis_server.src.single_context_manager;
 
 import 'dart:core' hide Resource;
 
 import 'package:analysis_server/src/single_context_manager.dart';
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 65 matching lines @@
     DartSdkManager sdkManager = new DartSdkManager((_) {
       return new MockSdk();
     });
     manager = new SingleContextManager(resourceProvider, sdkManager,
         () => packageResolver, analysisFilesGlobs);
     callbacks = new TestContextManagerCallbacks(resourceProvider);
     manager.callbacks = callbacks;
     resourceProvider.newFolder(projPath);
   }
 
+  void test_isIgnored_false() {
+    String project = '/project';
+    manager.setRoots(<String>[project], <String>[], <String, String>{});
+    expect(manager.isIgnored('$project/file.dart'), isFalse);
+  }
+
+  void test_isIgnored_true_inDotFolder() {
+    String project = '/project';
+    manager.setRoots(<String>[project], <String>[], <String, String>{});
+    expect(manager.isIgnored('$project/foo/.bar/file.dart'), isTrue);
+  }
+
+  void test_isIgnored_true_inExcludedPath() {
+    String project = '/project';
+    String excludedPath = '/project/excluded';
+    manager.setRoots(
+        <String>[project], <String>[excludedPath], <String, String>{});
+    expect(manager.isIgnored('$excludedPath/file.dart'), isTrue);
+  }
+
+  void test_isIgnored_true_notInRoot() {
+    String root1 = '/context/root1';
+    String root2 = '/context/root2';
+    manager.setRoots(<String>[root1, root2], <String>[], <String, String>{});
+    expect(manager.isIgnored('$context/root3/file.dart'), isTrue);
+  }
+
+  void test_isInAnalysisRoot_false_inExcludedPath() {
+    String project = '/project';
+    String excludedPath = '/project/excluded';
+    manager.setRoots(
+        <String>[project], <String>[excludedPath], <String, String>{});
+    expect(manager.isInAnalysisRoot('$excludedPath/file.dart'), isFalse);
+  }
+
+  void test_isInAnalysisRoot_false_notInRoot() {
+    String root1 = '/context/root1';
+    String root2 = '/context/root2';
+    manager.setRoots(<String>[root1, root2], <String>[], <String, String>{});
+    expect(manager.isInAnalysisRoot('$context/root3/file.dart'), isFalse);
+  }
+
+  void test_isInAnalysisRoot_true() {
+    String project = '/project';
+    manager.setRoots(<String>[project], <String>[], <String, String>{});
+    expect(manager.isInAnalysisRoot('$project/file.dart'), isTrue);
+  }
+
   void test_setRoots_addFolderWithDartFile() {
     String filePath = posix.join(projPath, 'lib', 'foo.dart');
     resourceProvider.newFile(filePath, 'contents');
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     // verify
     callbacks.assertContextFiles(projPath, [filePath]);
     // There is an analysis context.
     List<AnalysisContext> contextsInAnalysisRoot =
         manager.contextsInAnalysisRoot(rootFolder);
     expect(contextsInAnalysisRoot, hasLength(1));
@@ skipping 373 matching lines @@
         String relPath = resourceProvider.pathContext.joinAll(relSegments);
         Resource file = rootFolder.getChild(relPath);
         if (file is File && file.exists) {
           return file.createSource(uri);
         }
       }
     }
     return null;
   }
 }