Heads up: I've just released z3c.coverage which renames the *.cover -> HTML conversion script from bin/coverage to bin/coveragereport, to avoid name clashes with Ned Batchelder's coverage. Your buildout/buildbot config files and/or makefiles may need updating. There are two ways to measure your test coverage and produce HTML reports: first, use zope.testing's builtin trace.py support and z3c.coverage bin/test --coverage=dirname ... bin/coveragereport parts/test/dirname outdir The second way is to use http://pypi.python.org/pypi/coverage, which is *much* faster but isn't as reliable (I've seen results that are physically impossible, but haven't narrowed down the bug yet) bin/coverage run bin/test ... bin/coverage html -d outdir Also, I'm not aware of a replacement for bin/coveragediff that supports coverage.py, but a 4x speed increase is maybe worth a few bugs and setbacks. Marius Gedminas -- http://pov.lt/ -- Zope 3 consulting and development