pythonpytest

How to execute ipdb.set_trace() at will while running pytest tests

I'm using pytest for my test suite. While catching bugs in complex inter-components test, I would like to place import ipdb; ipdb.set_trace() in the middle of my code to allow me to debug it.

However, since pytest traps sys.stdin/sys.stdout ipdb fails. How can I use ipdb while testing with pytest.

I'm not interested in jumping to pdb or ipdb after a failure, but to place breaks anywhere in the code and be able to debug it there before the failure occurs.

Solution

  • The error is raised because pytest captures output by default.

    You can run pytest with -s option (turn off capture output). For example:

    py.test -s my_test.py

    and then in my_test.py:

    import ipdb;
ipdb.set_trace()