First I needed to install mysql, postgres, and nose on my macbook. I didn't investigate why i needed 2 different databases. Once they were installed i made sure that mysql_config and pg_config were in my path.
I then grabbed a copy of nova from git and set up the virtual environment
git clone https://github.com/openstack/nova.git
Since my virtual environment was not created, the script asked to create it and about 1/2 hour later it was all done.
Then i created a new project in pycharm by adding the nova directory and made sure that my python interpreter was pointing to my virtual env for this project.
Then edit your debug/runtime configuration and so it looks like this - i've created a /tmp/lock directory for lock files.
Ready to go - I opened up the tests that i wanted to run - nova/tests/virt/test_virt.py and right clicked on the run unit tests
and the tests run. You will see the ones that passed and failed and can drill down into the failures. In this case you can see that it's having double with /proc - which doesn't exist on a mac. +Shawn Hartsock has a patch for that which will hopefully be upstreamed soon.
I'm hoping this will be useful in my next patches as I try to write tests and code at the same time. Please update if you follow this and have other issues. I'll try to keep it updated as I continue using unit tests in pycharm.