Bug with version 0.1.1 of secure attribute

secure_attribute.rb

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "rails", "5.1.6"
  gem "sqlite3"
  gem "secure_attribute", "0.1.1"
end

require "active_record"
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)

class Tenant < ActiveRecord::Base
  include SecureAttribute
  attr_secure :private_token, algorithm: "AES-256-CBC", key: Base64.decode64("PfpSjJPSncGNuAjyv4JUieyw03Gjxd2Y4Gt0JzHm6Mw=")
end

ActiveRecord::Schema.define do
  create_table :tenants, force: true do |t|
    t.string :private_token
  end
end

class BugTest < Minitest::Test
  def test_create_tenant
    tenant = Tenant.create!(private_token: "123-abc")
    assert_equal "123-abc", tenant.reload.private_token
  end
end