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_gem_commands_owner_command.rb
    path of file: ./repos/jruby/test/mri/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require_relative 'helper'
require 'rubygems/commands/owner_command'

class TestGemCommandsOwnerCommand < Gem::TestCase
  def setup
    super

    credential_setup

    ENV["RUBYGEMS_HOST"] = nil
    @stub_ui = Gem::MockGemUi.new
    @stub_fetcher = Gem::Fa
    
  def test_show_owners_setting_up_host_through_env_var
    response = "- email: user1@example.com\n"
    host = "http://rubygems.example"
    ENV["RUBYGEMS_HOST"] = host

    @stub_fetcher.data["#{host}/api/v1/gems/freewill/owners.yaml"] = [response, 200, 'OK']

    use_ui @stub_ui do
      @cmd.show_owners("freewill")
    end

    assert_match %r{Owners for gem: freewill}, @stub_ui.output
    assert_match %r{- user1@example.com}, @stub_ui.output
  end