You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: helpers.rb
    path of file: ./repos/mobility/spec/support
    
    the code of the file until where you have to start completion: module Helpers
  def stringify_keys(hash)
    result = Hash.new
    hash.each_key { |key| result[key.to_s] = hash[key] }
    result
  end

  def self.included(base)
    base.extend LazyDescri
    
      def plugin_setup(*attribute_names, **kwargs)
        attribute_names = DUMMY_NAMES if attribute_names.empty?

        let(:translation_options) { { backend: backend_class, **kwargs } }

        let(:listener) { double(:backend) }
        let(:backend_class) { backend_listener(listener) }
        let(:backend) { instance.mobility_backends[attribute_names.first] }
        attribute_names.each { |name| let(:"#{name}_backend") { instance.send("#{name}_backend") } }

        translates(*attribute_names)
      end
    end