From: LeahH <leah@...>
Date: 2007-06-25T08:05:11+09:00
Subject: Re: Unit Testing Custom Validation Method

Alrighty, I have a solution...

Instead of embedding all my validation code in custom_validations,
I've moved the code into it's own module and I call it from
custom_validations like this

lib/custom_validations.rb
require 'lib/utils/authentication'

module ActiveRecord
  module Validations
    module ClassMethods

      def validates_as_email(*attr_names)
        configuration = { :message => "Invalid email address" }
        configuration.update(attr_names.pop) if attr_names.last.is_a?
(Hash)

        validates_each(attr_names, configuration) do |record,
attr_name, value|
          record.errors.add(attr_name, configuration[:message])
unless !value.nil? and Utils::Authentication.valid_email?( value )
        end
      end
    end
  end
end


lib/utils/authenticaion.rb
module Utils
  module Authentication

    def valid_email?( value )
      ... a whole lot of regexp code ...
    end

  end
end

Now I can unit test my custom validation code.
Sweet!