Infer nosetests in python project

I was reading on https://circleci.com/docs/language-python that

CircleCI automatically runs tox when we find a tox.ini file, and runs nosetests when we find a unittest.py file. If you are using Django, then Circle will run manage.py test.

What is the unittest.py file supposed to look like for inferred nosetests?

I can find no resource or documentation about such a file, and would like to use the inferred nosetesting. Are there any example projects that have inferred nosetesting properly set up?

See if this links help:

http://pyunit.sourceforge.net/pyunit.html

http://svn.python.org/projects/python/branches/release22-maint/Lib/unittest.py