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_store.rb
    path of file: ./repos/ruby-packer/ruby/test/yaml
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require 'test/unit'
require 'yaml/store'
require 'tmpdir'

class YAMLStoreTest < Test::Unit::TestCase
  def setup
    @yaml_store_file = File.join(Dir.tmpdir, "yaml_store.tmp.#{Process.pid}")
    @yaml_store = YAML::Store.new(@yaml_store_file)
  end

  def teardown
    File.unlink(@yaml_store_file) rescue nil
  end

  def test_opening_new_file_in_readonly_mode_should_result_in_empty_values
    @yaml_store.transaction(true) do
      assert_nil @yaml_store[:foo]
      assert_nil @yaml_store[:bar]
    end
    
  def test_with_options
    bug12800 = '[ruby-dev:49821]'
    default_yaml = "---\na:\n- - b\n"
    indentation_3_yaml = "---\na:\n-  - b\n"

    @yaml_store = YAML::Store.new(@yaml_store_file)
    @yaml_store.transaction do
      @yaml_store['a'] = [['b']]
    end
    assert_equal(default_yaml, File.read(@yaml_store_file), bug12800)

    @yaml_store = YAML::Store.new(@yaml_store_file, true)
    @yaml_store.transaction do
      @yaml_store['a'] = [['b']]
    end
    assert_equal(default_yaml, File.read(@yaml_store_file), bug12800)

    @yaml_store = YAML::Store.new(@yaml_store_file, indentation: 3)
    @yaml_store.transaction do
      @yaml_store['a'] = [['b']]
    end
    assert_equal(indentation_3_yaml, File.read(@yaml_store_file), bug12800)

    @yaml_store = YAML::Store.new(@yaml_store_file, true, indentation: 3)
    @yaml_store.transaction do
      @yaml_store['a'] = [['b']]
    end
    assert_equal(indentation_3_yaml, File.read(@yaml_store_file), bug12800)
  end