Test for rails-rails#16684

# Activate the gem you are reporting the issue against.
gem 'activerecord', '4.0.3'
require 'active_record'
require 'minitest/autorun'
require 'logger'
require 'pry'

# 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)

ActiveRecord::Schema.define do
  create_table :my_notifications do |t|
    t.integer :my_other_class_id
  end

  create_table :my_other_classes do |t|
    t.string :message_type
    t.string :recipient
  end
end

class MyNotification < ActiveRecord::Base
  belongs_to :my_other_class, :autosave => true
  validates :recipient, presence: true
  delegate :recipient, :recipient=, to: :my_other_class
  before_create :build_my_class_if_missing

  def build_my_class_if_missing
    my_other_class ||= build_my_other_class(message_type: "MyMessageType")
  end
end

class MyOtherClass < ActiveRecord::Base
  has_many :my_notifications
end

class BugTest < Minitest::Test
  def test_delegate
    user = 'foo'
    notification = MyNotification.create(recipient: user)

    assert_equal notification.recipient, user
  end
end