Ignore bogus links, such as those created by emacs for files being edited.

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/package_map_provider.dart';
 import 'package:analysis_server/src/resource.dart';
@@ skipping 115 matching lines @@
       String projPath = '/my/proj';
       resourceProvider.newFolder(projPath);
       String filePath = posix.join(projPath, 'foo.dart');
       resourceProvider.newFile(filePath, 'contents');
       manager.setRoots(<String>[projPath], <String>[]);
       var filePaths = manager.currentContextFilePaths[projPath];
       expect(filePaths, hasLength(1));
       expect(filePaths, contains(filePath));
     });
 
+    test('add folder with dummy link', () {
+      String projPath = '/my/proj';
+      resourceProvider.newFolder(projPath);
+      String filePath = posix.join(projPath, 'foo.dart');
+      resourceProvider.newDummyLink(filePath);
+      manager.setRoots(<String>[projPath], <String>[]);
+      var filePaths = manager.currentContextFilePaths[projPath];
+      expect(filePaths, isEmpty);
+    });
+
     test('add folder with dart file in subdir', () {
       String projPath = '/my/proj';
       resourceProvider.newFolder(projPath);
       String filePath = posix.join(projPath, 'foo', 'bar.dart');
       resourceProvider.newFile(filePath, 'contents');
       manager.setRoots(<String>[projPath], <String>[]);
       var filePaths = manager.currentContextFilePaths[projPath];
       expect(filePaths, hasLength(1));
       expect(filePaths, contains(filePath));
     });
@@ skipping 37 matching lines @@
     });
 
     group('detect context modifications', () {
       String projPath;
 
       setUp(() {
         projPath = '/my/proj';
         resourceProvider.newFolder(projPath);
       });
 
+      test('Add dummy link', () {
+        manager.setRoots(<String>[projPath], <String>[]);
+        Map<String, int> filePaths = manager.currentContextFilePaths[projPath];
+        expect(filePaths, isEmpty);
+        String filePath = posix.join(projPath, 'foo.dart');
+        resourceProvider.newDummyLink(filePath);
+        return pumpEventQueue().then((_) {
+          expect(filePaths, isEmpty);
+        });
+      });
+
       test('Add file', () {
         manager.setRoots(<String>[projPath], <String>[]);
         Map<String, int> filePaths = manager.currentContextFilePaths[projPath];
         expect(filePaths, hasLength(0));
         String filePath = posix.join(projPath, 'foo.dart');
         resourceProvider.newFile(filePath, 'contents');
         return pumpEventQueue().then((_) {
           expect(filePaths, hasLength(1));
           expect(filePaths, contains(filePath));
         });
@@ skipping 76 matching lines @@
         packageMapProvider.packageMap = null;
         resourceProvider.modifyFile(dependencyPath, 'new contents');
         return pumpEventQueue().then((_) {
           // The package map should have been changed to null.
           expect(manager.currentContextPackageMaps[projPath], isNull);
         });
       });
     });
   });
 }