you can run test covering directly with zopectl this way
zopect test -T -vv --dir /my/tests/dir/
it will create a cover folder with all covering infos
it renders % of cover also.
though, the render is not as "good looking" as CPS's cover.py
(and this might be recoded sometimes)
(Post originally written by Tarek Ziadé on the old Nuxeo blogs.)