anchor.diff:  void setMockFilesystemAccess() {
     // TODO(ericarnold): Assert something else about FSA
   //  assert(_fileSystemAccess == null);
  -  _mockFileSystemAccess = new MockFileSystemAccess();
  +  _fileSystemAccess = new MockFileSystemAccess();
   }
   
   FileSystemAccess get fileSystemAccess {
  -  if (_mockFileSystemAccess != null) return _mockFileSystemAccess;
  -
     if (_fileSystemAccess == null) {
       _fileSystemAccess = new FileSystemAccess._();
     }
  
positive.code:     return new Future.value(entry.fullPath);
    }
  
    Future restoreManager(Spark spark, String folderToken) =>
        throw "Can't restore mock manager";
  
    Future<ProjectLocationManager> restoreMockManager(Spark spark) {
      return MockProjectLocationManager.restoreManager(spark)
          .then((ProjectLocationManager manager) {
            _locationManager = manager;
  
negative.code:    */
    static Future<ProjectLocationManager> restoreManager(Spark spark,
        String folderToken) {
  
      // If there is nothing to restore, create a new ProjectLocationManager.
      if (folderToken == null) {
        return new Future.value(new ProjectLocationManager._(spark));
      }
  