Lots of Zenmap's component Python modules have unit tests of some sort or other, but many are just "run this function if __name__=='__main__'" type of things. We currently use the test discovery built in to Python 2.7's unittest library, so this task could be taken in a few different steps:

1. Convert existing tests to unittest test cases so that autodiscovery can pick them up.
2. Add new test cases for functions and modules not covered by any tests.
3. Use a more robust testing structure (like a zenmap/tests/ directory) so we don't rely on autodiscovery, which doesn't work on Python 2.6 and earlier.