Following advice from marienz, I adapted dev-python/pylint-0.12.1.ebuild's src_test to celementtree. I also compacted the ebuild inheritance, because distutils already inherits from eutils.
Created attachment 102373 [details, diff] dev-python/celementtree-1.0.5.ebuild src_test patch dev-python/celementtree-1.0.5.ebuild src_test patch
In Portage. Thanks!