Often there is no need to install the suit of unit test cases along with the python library. So I have a setup script which has a test_suite value which isn't included in the py_modules list.
Now when it comes to supporting Python3 via 2to3, it would be nice if those tests were fixed / adjusted as well. Currently they are not, at least that's the way it looks on my system with diustribute 0.6.19.
It should be easy to apply 2to3 to the unit tests as well, storing the result somewhere inside the build directory, but in a location where it won't be installed to the final destination.