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: tester_manager.rb
    path of file: ./repos/fastlane/pilot/lib/pilot
    
    the code of the file until where you have to start completion: require 'terminal-table'

require_relative 'manager
    
    def list_testers(options)
      start(options)

      app = find_app(apple_id: config[:apple_id], app_identifier: config[:app_identifier])
      if app
        list_testers_by_app(app)
      else
        UI.user_error!("You must include an `app_identifier` to `list_testers`")
      end