dm_factory_girl.rb

require 'test/unit'
require 'rubygems'
require 'shoulda'
require 'factory_girl'

require 'dm-core'
require 'dm-validations' # Needed for save!

class User
  
  include DataMapper::Resource
  
  property :id, Serial
  property :name, String
  property :key, String
  property :domain, String
  property :email, String
  
  has 1, :gizmo
  
  def self.generate_key
    'BONK'
  end
  
end

class Gizmo
  
  include DataMapper::Resource
  
  property :id, Serial
  property :name, String
  property :user_id, Integer
  
  belongs_to :user
  
end

DataMapper.setup(:default, :adapter => 'in_memory')

Factory.sequence :gizmo_name do |n|
  "widget#{n}"
end

Factory.define(:user) do |u|
  u.name 'Adam'
  u.key { User.generate_key }
  u.domain 'example.com'
  u.email { |u| "#{u.name.downcase}@#{u.domain}" }
end

Factory.define(:thingy, :class => Gizmo) do |g|
  g.name 'Thingy'
  g.user { |user| user.association(:user, :domain => 'foo.com') }
end

Factory.define(:doodad, :class => Gizmo) do |d|
  d.name 'Doodad'
  d.association :user, :factory => :user
end

Factory.define(:widget, :class => Gizmo) do |w|
  w.name Factory.next(:gizmo_name)
  w.association :user
end

class TestUser < Test::Unit::TestCase
  
  def teardown
    User.all.destroy!
    Gizmo.all.destroy!
  end
  
  should 'build a user' do
    user = Factory.build(:user)
    assert_equal 'Adam', user.name
  end
  
  should 'create a user' do
    user = Factory(:user)
    assert !user.dirty?
  end
  
  should 'have a lazy-generated key' do
    user = Factory.build(:user)
    assert_equal 'BONK', user.key
  end
  
  should 'have a dependent email address' do
    user = Factory.build(:user)
    assert_equal 'adam@example.com', user.email
  end
  
  should 'create a user with a dependent gizmo' do
    gizmo = Factory(:thingy)
    assert_equal 'Adam', gizmo.user.name
  end
  
  should 'create a user with a dependent gizmo via syntactic sugar' do
    gizmo = Factory(:doodad)
    assert_equal 'Adam', gizmo.user.name
  end
  
  should 'use a sequence to generate a widget' do
    Factory(:widget)
    Factory(:widget)
    gizmo = Factory(:widget)
    
    assert_equal 3, Gizmo.all.length
    assert_match /widget/, gizmo.name
  end
  
end