Don't want to encroach, but on your BDD testing spectrum I would like to advise:

Install pexpect using python-pip: sudo pip install pexpect
Install behave using python-pip: sudo pip install behave

This should be expanded to using virtual-environment rather than a sudo global install. This keeps the testing structure local to the project, and does not interfere with the global system.

• install virtualenv (many different ways)
• Create virtualenv: virtualenv venv
• Activate: . venv/bin/activate
• Install pexpect: pip install pexpect