I've written a bit of Emacs Lisp, and I've written unit tests in other
languages. From the list of tools on http://emacswiki.org/emacs/UnitTesting,
ert.el and el-expectations.el look most promising to me. What tools are
others using for unit testing and TDD in Emacs Lisp? What are good examples
of packages using each?

-- 
Matt McClure
http://www.matthewlmcclure.com
http://www.mapmyfitness.com/profile/matthewlmcclure