Unable to debug in pycharm with pytest

Solution 1:

For my situation, I found what the problem is:

If there is --cov in pytest.ini, then breakpoints in pycharm won't work, after deleting all --cov in pytest.ini, the breakpoints in pycharm can work.

Reason:

"The coverage module and pycharm's debugger use the same tracing api (sys.settrace) - they don't work together. " -- https://github.com/pytest-dev/pytest-cov/issues/131

References:

How to debug py.test in PyCharm when coverage is enabled

Solution 2:

The root issue is debugging does not work if you have coverage enabled by default (usually on pytest.ini).

To disable just on pycharm, just add --no-cov on the Additional Arguments on the Run/Debug Configurations.
Update Templates -> Python tests -> pytest, so every new test gets this configuration.
After this, delete your current debug settings and redebug it.

Pycharm 2018.3.x (still works in 2020.x)

Solution 3:

TL;DR: Disable the "Gevent compatible" flag in the "Build, execution, Deployment" -> "Python Debugger".

It seems that at some point I enabled the "Gevent compatible" debugger in pycharm, and since then pytest-pycharm stopped working. Disabling it will make pytest-pycharm work again. I hope this will solve the issue for some of you.

Solution 4:

I know that you had it right, but for me actually setting the Default test runner to pytest solved the problem. In PyCharm: Settings -> Python Integrated Tools -> Testing section -> Default test runner -> choose pytest from the dropdown menu -> Apply. And it instantly works.