Testing a gem which depends on rails' eviroment

Hi,
I’ve changed the rails’ inflection file for my project in order to
support
Spanish pluralize and singularize. I’ve tested it successfully in my
rails
project.
Now, since it is a common task for me when creating new projects, I want
to
create a gem for doing this (replace the default inflections file with
mine).
The problem is, the gem needs the rails’ environment loaded in order to
get
tested. How can I do that?
I want to test with rspec.

Thanks.