How to run only one test in tox?

I’m trying to write a new test for a project and I’d like to test only that one test in tox. I’m already completely sure that other tests are fine, I don’t need them being run every time. The only suggestion I’ve found doesn’t work with

ERROR: InvocationError: could not find executable 

Answer

As written by jason meridth:

$ 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-pep8
commands =
    pip install -e .
    pytest {posargs}

Run one test with unittest

python3 -m unittest -q test_file.TestClassName