omg.rb

require 'active_record'
require 'minitest/autorun'

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

ActiveRecord::Base.connection.instance_eval do
  create_table(:users) do |t|
    t.string :name
    t.timestamps
  end
end

class User < ActiveRecord::Base
end

Class.new(Minitest::Test) do
  def test_blah
    u = User.new
    t = 1.hour.ago.utc
    u.name = 'Aaron'
    u.updated_at = t
    u.save!
    u.reload

    assert_equal t, u.updated_at
  end
end