Topic: Location of custom test subclasses...

My collection of custom test helpers (custom model assertions, acceptence test DSL, various surrogates needed to make some of block based DSLs work, etc) has been growing rather rapidly.  For a while most of it lived in test_helper.rb, but now its getting too cluttered and I was wondering how other people have structured their in-house testing add-ons -- in lib/test/?  in test/in-house, test/lib? test/extensions?  Anything seem more railish?

My RoR journey  -- thoughts on learning RoR and lessons learned in applying TDD and agile practices.