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: check_command.rb
    path of file: ./repos/rubygems/lib/rubygems/commands
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "../command"
require_relative "../version_option"
require_relative "../validator"
require_relative "../doctor"

class Gem::Commands::CheckCommand < Gem::Command
  include Gem::VersionOption

  def initialize
    super "check", "Check a gem repository for added or missing files",
          alien: true, doctor: false, dry_run: false, gems: true

    add_option("-a", "--[no-]alien",
               'Report "unmanaged" or rogue files in the',
               "gem repository") do |value, options|
      options[:alien] = value
    end

    add_option("--[no-]doctor",
               "Clean up uninstalled gems and broken",
               "specifications") do |value, options|
      options[:doctor] = value
    end

    add_option("--[no-]dry-run",
               "Do not remove files, only report what",
               "would be removed") do |value, options|
      options[:dry_run] = value

    
  def initialize
    super "check", "Check a gem repository for added or missing files",
          alien: true, doctor: false, dry_run: false, gems: true

    add_option("-a", "--[no-]alien",
               'Report "unmanaged" or rogue files in the',
               "gem repository") do |value, options|
      options[:alien] = value
    end

    add_option("--[no-]doctor",
               "Clean up uninstalled gems and broken",
               "specifications") do |value, options|
      options[:doctor] = value
    end

    add_option("--[no-]dry-run",
               "Do not remove files, only report what",
               "would be removed") do |value, options|
      options[:dry_run] = value
    end

    add_option("--[no-]gems",
               "Check installed gems for problems") do |value, options|
      options[:gems] = value
    end

    add_version_option "check"
  end

  def check_gems
    say "Checking gems..."
    say
    gems = begin
             get_all_gem_names
           rescue StandardError
             []
           end

    Gem::Validator.new.alien(gems).sort.each do |key, val|
      if val.empty?
        say "#{key} is error-free" if Gem.configuration.verbose
      else
        say "#{key} has #{val.size} problems"
        val.each do |error_entry|
          say "  #{error_entry.path}:"
          say "    #{error_entry.problem}"
        end
      end
      say
    end