class Cat < ActiveRecord::Base; include Animal; end

We have the Animal module that contains common behaviour between Cats and Dogs, and we tested the Animal module not directly, but through testing Cat and Dog.

An alternative will be to have a test suite for the Animal module:

class AnimalTest < Test::Unit::TestCase

and have a test animal that includes Animal:

class TestAnimal < ActiveRecord::Base; include Animal

and test Animal that way. It just turns out that in our project, on the Animal module there are many template methods and so it\’s easier to test the subclasses rather than the module.

How are ya? I’m curious what the motivation to retest base class behavior when you’re testing a class.

Thanks! Take care.
-Prasanna