encrypt_test.rb

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"
  gem "activerecord", "~> 5.0.0"
  gem 'sqlite3'
  gem 'attr_encrypted', '~> 3.0', require: false
end

require 'active_record'
require 'attr_encrypted'
require 'minitest/autorun'

logger = Logger.new STDOUT
logger.level = 0
ActiveRecord::Base.logger = logger

KEY = SecureRandom.random_bytes(32)

class User < ActiveRecord::Base
  establish_connection adapter: 'sqlite3', database: 'test'

  connection.create_table table_name, force: true do |t|
    t.string :name
    t.string :encrypted_email
    t.string :encrypted_email_iv
    t.timestamps null: true
  end

  attr_encrypted :email, key: KEY
end

p ActiveRecord.version

class FooTest < Minitest::Test
  def test_email
    foo = User.new(name: 'Arthur')
    foo.email = 'foo@test.com'
    foo.save!
    assert_equal 1, User.count
    refute_nil foo.encrypted_email
    refute_nil User.last.encrypted_email
  end
end