How to make pytest run doctests as well as normal tests directory?

Could you try with the repo version of pytest and paste a session log? I'd think --doctest-modules should pick up any .py files.

Now it is implemented :-).

To use, either run py.test --doctest-modules command, or set your configuration with pytest.ini:

$ cat pytest.ini
# content of pytest.ini
[pytest]
addopts = --doctest-modules

Man page: PyTest: doctest integration for modules and test files.