should_be_valid_with_factory macro for shoulda/factory_girl

gistfile1.rb

class ActiveSupport::TestCase

  self.use_transactional_fixtures = true
  self.use_instantiated_fixtures  = false

  def self.should_be_valid_with_factory    
    klass = self.name.gsub(/Test$/, '').downcase.to_sym
    should "be valid with factory" do
      assert_valid Factory.build(klass)
    end    
  end

end