Test all factories automatically with TestUnit

test_unit_factories_test.rb

# encoding: UTF-8

require 'test_helper'

class FactoryTest < ActiveSupport::TestCase
  FactoryGirl.factories.map(&:name).each do |factory_name|
    context "The #{factory_name} factory" do
      setup do
        # ...
        @factory = FactoryGirl.build(factory_name)
      end

      should "be valid" do
        assert @factory.valid?, "but is not valid: #{@factory.errors.first}"
      end
    end
  end
end