I'm giving an introductory talk on testing tomorrow for Utah Python. I'm planning to cover unittest, doctest, coverage and interpreting coverage results. At the end will be a hands on session for applying what we've learned. We'll write a simple program and then try and achieve good test coverage using unittest, doctest and figleaf. If you don't have a laptop, you can pair with someone who does.
If you're in the Salt Lake area, I'd invite you to come out. We don't bite too hard. Plus there's usually food and beverages.