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: test_rack_env.rb
    path of file: ./repos/nii/nii-core/test
    
    the code of the file until where you have to start completion: require_relative 'setu
    
  def rack_env(*args)
    env = { 'PATH_INFO' => '/', 'SCRIPT_NAME' => '', 'REQUEST_METHOD' => 'GET' }
    args.each do |arg|
      arg = { arg['/'] ? 'PATH_INFO' : 'HTTP_ACCEPT_LANGUAGE' => arg } if arg.is_a? String
      env.merge! arg
    end
    env
  end