It took me some time to realize that the names of unittest test methods must start with "test_". It says so in the python unittest documentation, but I think mentioning it in the Django documentation could save someone else a non-negligible amount of time. Just a brief mention here would be sufficient:
https://docs.djangoproject.com/en/1.6/topics/testing/overview/#running-tests
However, looking at the documentation, I found a bigger problem. It is not clear to me where to even post suggestions for documentation improvement. Bug reports and feature requests are covered, but I think contributing to documentation is where the widest group of people could participate.
-Sakari