From: James Herdman <james.herdman@...>
Date: 2006-03-25T13:43:55+09:00
Subject: Regarding Testing Mixins

How does one write a unit test for a mixin?  I gathered since our unit 
test is a class (TestClassName < Test::Unit::TestCase), we could just 
include said module into said class.  However, I've ran into a problem.

Suppose my project directory is as follows:

../project_dir/trunk/lib		# Where all my classes and scripts go
../project_dir/trunk/tests	# Where all my tests go

My mixin resides in the lib folder, and normally I use this neat trick 
to handle this discreprancy in file locations:

$:.unshift File.join(File.dirname(__FILE__), "..", "lib") # Thank you Pick Ax!

Why doesn't this seem to work for mixins?  Where does Ruby look for mixins?

I'm assuming it's a path problem despite the fact that Ruby groans that 
the name I'm providing it is an unitialized constant (e.g. include 
Mixin -- if I write include "Mixin", Ruby tells me "wrong argument type 
String (expected Module)")

Thank you,

James Herdman