PyTong is a free and open-source front end to the Python 'unittest' module. PyTong displays a tree view with all the tests from the TestCase derived classes in a module.
Furthermore, the tests are run in a background thread and can be started and stopped from the GUI. Grondwerk IT uses PyTong with the Selenium web application testing system to test web sites with Python scripts.
In addition, the installer includes a ready to run sample using Selenium (but needs a Java environment already installed).
PyTong is cross-platform and it works on Mac OS X and Windows. Binaries for the Windows platform are available on the project's homepage.
Detailed instructions on how to install and use the PyTong utility on your Mac are available HERE.