Mox3 is an unofficial port of the Google mox framework (http://code.google.com/p/pymox/) to Python 3. It was meant to be as compatible with mox as possible, but small enhancements have been made. The library was tested on Python version 3.2, 2.7 and 2.6.The testing system is based on a combination of tox and testr. The canonical approach to running tests is to simply run the command tox. This will create virtual environments, populate them with depenedencies and run all of the tests that OpenStack CI systems run. Behind the scenes, tox is running testr run --parallel, but is set up such that you can supply any additional testr arguments that are needed to tox. For example, you can run: tox -- --analyze-isolation to cause tox to tell testr to add --analyze-isolation to its argument list.