Rails - Jun 2007 - Unit Testing Custom Validation Method

I posted this on comp.lang.ruby and thought it would be in my best
interest to post it here too.

I''ve written a custom validation method (to validate an email
address).  It looks like

module ActiveRecord
  module Validations
    module ClassMethods

      def validates_as_email
        ...
      end

    end
  end
end

I''ve put this code in app/lib/custom_validations.rb

Now, I''m trying to write a unit test but I''m running into
problems.
One attempt at a unit test looks like

require File.dirname(__FILE__) + ''/../test_helper''
require ''lib/custom_validations''

class CustomValidationsTest < Test::Unit::TestCase

  def test_validates_as_email
    email = "some...-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org"
    assert validates_as_email( email )
  end
end

This throws a
NoMethodError: undefined method `validates_as_email'' for
#<CustomValidationsTest:0x314bd80>
It looks to me like the test is looking for the validates_as_email
method to be defined in CustomValidationsTest rather than finding it
in lib/custom_validations.rb

So, I tried this

require File.dirname(__FILE__) + ''/../test_helper''
require ''lib/custom_validations''

class CustomValidationsTest < Test::Unit::TestCase

  def test_validates_as_email
    email = "some...-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org"
    assert
ActiveRecord::Validations::ClassMethods.validates_as_email( email )
  end
end

And I got this error
NoMethodError: undefined method `validates_as_email'' for
ActiveRecord::Validations::ClassMethods:Module

What am I missing?  I''ll bet it''s something simple, but I just
can''t
figure out what''s wrong.  Thanks for the help.


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