Refactoring Tests

Hi, Rails Group.

After realizing that I write the same tests for my simple models over and over again, I refactored the more common of the into the following module:

http://snippets.dzone.com/posts/show/3591

What do you think about refactoring tests? Do you have suggestions on which tests to add to the snippet above? Do you know if there is a project out there that does more sophisticated refactoring of tests?

Bests,

Manuel