# content of: tox.ini , put in same dir as setup.py [tox] ; envlist = py36, py37, py38, py39 ; py36 is really old https://endoflife.date/python ; and I can't install it on my machine without using pyenv. envlist = py36, py37, py38, py39, py310 [testenv] # install pytest in the virtualenv where commands will be executed deps = ; Pillow ; kiwisolver ; genism lxml pytest ; . commands = # NOTE: you can run any command line tool here - not just tests pytest