Support refresh of individual analysis roots (issue 22254)

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 111 matching lines @@
   }
 
   test_refresh_folder_with_pubspec() {
     // create a context with a pubspec.yaml file
     String pubspecPath = posix.join(projPath, 'pubspec.yaml');
     resourceProvider.newFile(pubspecPath, 'pubspec');
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     return pumpEventQueue().then((_) {
       expect(manager.currentContextPaths.toList(), [projPath]);
       manager.now++;
-      manager.refresh();
+      manager.refresh(null);
       return pumpEventQueue().then((_) {
         expect(manager.currentContextPaths.toList(), [projPath]);
         expect(manager.currentContextTimestamps[projPath], manager.now);
       });
     });
   }
 
+  test_refresh_oneContext() {
+    // create two contexts with pubspec.yaml files
+    String pubspecPath = posix.join(projPath, 'pubspec.yaml');
+    resourceProvider.newFile(pubspecPath, 'pubspec1');
+
+    String proj2Path = '/my/proj2';
+    resourceProvider.newFolder(proj2Path);
+    String pubspec2Path = posix.join(proj2Path, 'pubspec.yaml');
+    resourceProvider.newFile(pubspec2Path, 'pubspec2');
+
+    List<String> roots = <String>[projPath, proj2Path];
+    manager.setRoots(roots, <String>[], <String, String>{});
+    return pumpEventQueue().then((_) {
+      expect(manager.currentContextPaths.toList(), unorderedEquals(roots));
+      int then = manager.now;
+      manager.now++;
+      manager.refresh([resourceProvider.getResource(proj2Path)]);
+      return pumpEventQueue().then((_) {
+        expect(manager.currentContextPaths.toList(), unorderedEquals(roots));
+        expect(manager.currentContextTimestamps[projPath], then);
+        expect(manager.currentContextTimestamps[proj2Path], manager.now);
+      });
+    });
+  }
+
   test_refresh_folder_with_pubspec_subfolders() {
     // Create a folder with no pubspec.yaml, containing two subfolders with
     // pubspec.yaml files.
     String subdir1Path = posix.join(projPath, 'subdir1');
     String subdir2Path = posix.join(projPath, 'subdir2');
     String pubspec1Path = posix.join(subdir1Path, 'pubspec.yaml');
     String pubspec2Path = posix.join(subdir2Path, 'pubspec.yaml');
     resourceProvider.newFile(pubspec1Path, 'pubspec');
     resourceProvider.newFile(pubspec2Path, 'pubspec');
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     return pumpEventQueue().then((_) {
       expect(manager.currentContextPaths.toSet(),
           [subdir1Path, subdir2Path, projPath].toSet());
       manager.now++;
-      manager.refresh();
+      manager.refresh(null);
       return pumpEventQueue().then((_) {
         expect(manager.currentContextPaths.toSet(),
             [subdir1Path, subdir2Path, projPath].toSet());
         expect(manager.currentContextTimestamps[projPath], manager.now);
         expect(manager.currentContextTimestamps[subdir1Path], manager.now);
         expect(manager.currentContextTimestamps[subdir2Path], manager.now);
       });
     });
   }
 
@@ skipping 791 matching lines @@
     currentContextSources.remove(path);
     currentContextPackageUriResolvers.remove(path);
   }
 
   @override
   void updateContextPackageUriResolver(
       Folder contextFolder, UriResolver packageUriResolver) {
     currentContextPackageUriResolvers[contextFolder.path] = packageUriResolver;
   }
 }