def datasets_directory(path)
      Dataset::Resolver.default = Dataset::DirectoryResolver.new(path)
      Dataset::ContextClassMethods.datasets_database_dump_path = File.join(path, '/tmp/dataset')
    end
def datasets_directory(path)
      Dataset::Resolver.default = Dataset::DirectoryResolver.new(path)
      Dataset::ContextClassMethods.datasets_database_dump_path = File.join(path, '/tmp/dataset')
    end
Replaces the default Dataset::Resolver with one that will look for
 dataset class definitions in the specified directory. Captures of the
 database will be stored in a subdirectory 'tmp' (see
 Dataset::Database::Base).