accepts_nested_attributes_for.rb

module AcceptsNestedAttributesFor
  
  def should_accept_nested_attributes_for(*models)
    klass = self.name.gsub(/Test$/, '').constantize
    
    models.each do |model|
      should "accept nested attributes for #{model}" do
        assert(klass.instance_methods.include?("#{model}_attributes="),
               "#{klass} does not accept nested attributes for #{model}")
      end
    end
  end
  
end

class ActiveSupport::TestCase
  extend AcceptsNestedAttributesFor
end