http://codereview.appspot.com/6847080/diff/1/setup.py File setup.py (left): http://codereview.appspot.com/6847080/diff/1/setup.py#oldcode59 setup.py:59: # we use a public tox version to test, see tox.ini's testenv this can directly reference tox._quickstart:main so that tox/__init__ doesn't need to include it. http://codereview.appspot.com/6847080/diff/1/tox/__init__.py File tox/__init__.py (right): http://codereview.appspot.com/6847080/diff/1/tox/__init__.py#newcode24 tox/__init__.py:24: from tox._quickstart import main as quickstart this import is not needed and slows down the general tox importing http://codereview.appspot.com/6847080/diff/1/tox/_quickstart.py File tox/_quickstart.py (right): http://codereview.appspot.com/6847080/diff/1/tox/_quickstart.py#newcode162 tox/_quickstart.py:162: - python setup.py test this desparately needs a py.test choice! :) http://codereview.appspot.com/6847080/diff/1/tox/_quickstart.py#newcode172 tox/_quickstart.py:172: let's default the dependencies to nose for "nosetests", "pytest" for "py.test" and "twisted" for "trial".