Gemfile

source 'https://rubygems.org'

gem 'activerecord'
gem 'globalize'
gem 'sqlite3'

globalize_after_save_test.rb

gem 'activerecord', '5.1.4'
gem 'globalize', '5.1.0'
gem 'minitest', '5.10.3' # https://github.com/seattlerb/minitest/issues/730

require 'active_record'
require 'globalize'
require 'minitest/autorun'
require 'logger'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

I18n.available_locales = [:en, :es]

ActiveRecord::Base.establish_connection(
  adapter: 'sqlite3',
  database: ':memory:'
)

silence_warnings do
  ActiveRecord::Schema.define(version: Time.now.to_i) do
    create_table :posts, force: true do |t|
    end

    create_table "post_translations", force: true do |t|
      t.integer  "post_id",    null: false
      t.string   "locale",     null: false
      t.datetime "created_at", null: false
      t.datetime "updated_at", null: false
      t.string   "title"
      t.text     "content"
    end
  end
end

class Post < ActiveRecord::Base
  translates :content, :title

  attr_reader :after_save_locale_values

  after_save do
    @after_save_locale_values = {}
    @after_save_locale_values[:i18n] = I18n.locale
    @after_save_locale_values[:globalize] = Globalize.locale
    @after_save_locale_values[:globalize_inside_i18n] =
      I18n.with_locale(:es) { Globalize.locale }
    @after_save_locale_values[:i18n_inside_globalize] =
      Globalize.with_locale(:es) { I18n.locale }
  end
end

class AfterSaveTest < Minitest::Test
  def setup
    @post = Post.new(title: 'Example')
    @post.save
  end

  def test_i18n_eq_default
    # I18n.locale in #after_save should be 'en'
    assert_equal :en, @post.after_save_locale_values[:i18n]
  end

  def test_globalize_eq_default
    # Globalize.locale in #after_save should be 'en'
    assert_equal :en, @post.after_save_locale_values[:globalize]
  end

  def test_i18n_inside_globalize_eq_globalize
    # Globalize.with_locale(:es) { I18n.locale } in #after_save should be :es
    assert_equal :es, @post.after_save_locale_values[:i18n_inside_globalize]
  end

  def test_globalize_inside_i18n_eq_i18n
    # I18n.with_locale(:es) { Globalize.locale } in #after_save should be :es
    assert_equal :es, @post.after_save_locale_values[:globalize_inside_i18n]
  end
end