Support for replacing of the context folder.

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 2355 matching lines @@
    * explicitly analyzed in those contexts.
    */
   final Map<String, Set<Source>> currentContextSources =
       <String, Set<Source>>{};
 
   /**
    * Resource provider used for this test.
    */
   final ResourceProvider resourceProvider;
 
+  /**
+   * The list of `flushedFiles` in the last [removeContext] invocation.
+   */
+  List<String> lastFlushedFiles;
+
   TestContextManagerCallbacks(this.resourceProvider);
 
   /**
    * Iterable of the paths to contexts that currently exist.
    */
   Iterable<String> get currentContextPaths => currentContextTimestamps.keys;
 
   @override
   AnalysisContext addContext(
       Folder folder, AnalysisOptions options, FolderDisposition disposition) {
@@ skipping 55 matching lines @@
   void assertContextPaths(List<String> expected) {
     expect(currentContextPaths, unorderedEquals(expected));
   }
 
   @override
   void computingPackageMap(bool computing) {
     // Do nothing.
   }
 
   @override
+  void moveContext(Folder from, Folder to) {
+    String path = from.path;
+    String path2 = to.path;
+    expect(currentContextFilePaths, contains(path));
+    expect(currentContextTimestamps, contains(path));
+    expect(currentContextSources, contains(path));
+    expect(currentContextFilePaths, isNot(contains(path2)));
+    expect(currentContextTimestamps, isNot(contains(path2)));
+    expect(currentContextSources, isNot(contains(path2)));
+    currentContextFilePaths[path2] = currentContextFilePaths.remove(path);
+    currentContextTimestamps[path2] = currentContextTimestamps.remove(path);
+    currentContextSources[path2] = currentContextSources.remove(path);
+  }
+
+  @override
   void removeContext(Folder folder, List<String> flushedFiles) {
     String path = folder.path;
     expect(currentContextPaths, contains(path));
     currentContextTimestamps.remove(path);
     currentContextFilePaths.remove(path);
     currentContextSources.remove(path);
+    lastFlushedFiles = flushedFiles;
   }
 
   @override
   void updateContextPackageUriResolver(AnalysisContext context) {
     // Nothing to do.
   }
 
   /// If [disposition] has a package map, attempt to locate `_embedder.yaml`
   /// files.
   void _locateEmbedderYamls(
@@ skipping 21 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }