ActiveRecord time parse test

test_it.rb

unless File.exists?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails', branch: '4-0-stable'
    #gem 'rails', github: 'rails/rails'
    #gem 'rails'
    gem 'sqlite3'
    #gem 'pg'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

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

config = {
  sqlite3: { database: ':memory:' },
  mysql: { database: 'junk_development', username: 'root' },
  postgresql: { database: ENV['PGDATABASE'], username: ENV['user'] },
}
adapter = ARGV[0] || 'sqlite3'
params  = config[adapter.to_sym].merge(adapter: adapter)
$logger = ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Base.establish_connection(params)
ActiveRecord::Schema.define do
  create_table :appointments do |t|
    t.datetime :start_at
  end
end

class Appointment < ActiveRecord::Base
end

class BugTest < Minitest::Unit::TestCase
  def test_datetime
    time = Time.at(1234567890)
    Appointment.create!(start_at: time)
    a = Appointment.last
    $logger.info "time_str=#{a.start_at.in_time_zone("Eastern Time (US & Canada)").to_s}"
    a.start_at = a.start_at.in_time_zone("Eastern Time (US & Canada)").to_s
    assert a.changes.empty?, a.changes
  end
end