How to run only one test in tox?

python tox

$ tox -e py35 -- project/tests/test_file.py::TestClassName::test_method

But the fine grain is mentioned by beluga.me in the comments: If you have a tox.ini file you might need to add the {posargs} to pytest in tox.ini:

[tox]envlist = py35[testenv]deps =    pytest    pytest-cov    pytest-pep8commands =    pip install -e .    pytest {posargs}

Run one test with unittest

python3 -m unittest -q test_file.TestClassName

python tox

Run this command:

tox -epy27 -- test_name