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: module_function_handler_spec.rb
    path of file: ./repos/yard/spec/handlers
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require File.dirname(__FILE__) + '/spec_helper'

RSpec.describe "YARD::Handlers::Ruby::#{LEGACY_PARSER ? "Legacy::" : ""}VisibilityHandler" do
  after { Registry.clear }

  def assert_module_function(namespace, name)
    k
    
  def assert_module_function(namespace, name)
    klass = Registry.at("#{namespace}.#{name}")
    instance = Registry.at("#{namespace}##{name}")
    expect(klass).not_to be nil
    expect(instance).not_to be nil
    expect(klass).to be_module_function
    expect(instance).not_to be_module_function
    expect(klass.visibility).to eq :public
    expect(instance.visibility).to eq :private
  end