Tox: How to debug pytest plugin in PyCharm?

[gaborbernat]

So tests invoking the tox command via _pytestplugin.py cannot be debugged because the debugger does not attach to the subprocess inside PyCharm. Is this the intended workflow?

[obestwalter]

I don't think there is an established workflow involving PyCharm. I also use PyCharm, but have not yet done any plugin debugging. Have you alreadfy tried to attach to the process explicitly as workaround?

[pawamoy]

When you run tox, it installs the project in its sub virtualenv, and then the files executed are not the one you edit/debug in PyCharm. To debug tests I usually create a configuration in PyCharm that just run the command to test (like pytest with arguments), not tox. This way the current files are executed and debugged.

[gaborbernat]

Both choices are valid, I think this is something we should cover in our developer documentation.