This tool helps identify those lines of code in your
program which didn't got executed while running.

download as: tgz, zip, gem
http://rubyforge.org/project/showfiles.php?group_id=18&release_id=361

see generated output here
http://neoneye.dk/coverage/

believe it or not.. version 0.2 is a great improvement over verion 0.1.

* XHTML1.0 strict.
* no absolute paths.
* outputs to local dir('coverage').
* sidebar which can be customized.

--
Simon Strandgaard