tl;dr: an update to PyMOTW for `unittest` in Python 3: Python Unit Testing Tutorial.
His series later culminated in the book: 'The Python Standard Library By Example'.
The PyMOTW entry on `unittest` was a great introduction to unit testing in Python. Since the PyMOTW version is getting quite outdated, I updated the `unittest` module entry.
This new version includes some edits and updates to the text, and all code and examples have been updated to reflect Python 3.3.
Have a look at my updated Python 3.3 version:
'Python Unit Testing Tutorial'
say no to bugs...