ar_sample2.rb

require 'active_record'
require 'minitest/autorun'

ActiveRecord::Base.establish_connection adapter: 'sqlite3', database: 'foobar.db'

class Record < ActiveRecord::Base
  connection.create_table table_name, force: true do |t|
    t.string :name
  end
end

class Foo < ActiveRecord::Base
  connection.create_table table_name, force: true do |t|
    t.string :name
    t.belongs_to :record
  end

  belongs_to :record
end

class Test < MiniTest::Unit::TestCase

  def test_ar
    rec = Record.create!(name: 'record')
    foo = Foo.create!(name: 'foo', record: rec)
    assert_equal 1, Record.count
    assert 1, Foo.count
  end
end