I'm running pytest
with --doctest-modules
and no other options.
I've got a doctest
test that's failing, and I'm trying to debug the issue by adding print()
statements to the underlying code.
Capturing output is working and displaying as expected for my regular (non- doctest
) tests, but the doctest
tests aren't showing stdout in my pytest
output, even though I've got print()
statements happening in there.
I could re-write my doctest
as a non- doctest
test in order to get those print()
statements to flow through, but that sounds like an awfully roundabout thing to do.
Is there any way to tell pytest
that I want it to capture output for doctest
s too?
$ python --version
Python 3.7.2
$ pytest --version
This is pytest version 3.10.1, imported from /home/gene/.pythonz/pythons/CPython-3.7.2/lib/python3.7/site-packages/pytest.py
setuptools registered plugins:
pytest-xdist-1.26.1 at /home/gene/.pythonz/pythons/CPython-3.7.2/lib/python3.7/site-packages/xdist/plugin.py
pytest-xdist-1.26.1 at /home/gene/.pythonz/pythons/CPython-3.7.2/lib/python3.7/site-packages/xdist/looponfail.py
pytest-pythonpath-0.7.3 at /home/gene/.pythonz/pythons/CPython-3.7.2/lib/python3.7/site-packages/pytest_pythonpath.py
pytest-mock-1.10.0 at /home/gene/.pythonz/pythons/CPython-3.7.2/lib/python3.7/site-packages/pytest_mock.py
pytest-forked-1.0.1 at /home/gene/.pythonz/pythons/CPython-3.7.2/lib/python3.7/site-packages/pytest_forked/__init__.py
hypothesis-4.4.1 at /home/gene/.pythonz/pythons/CPython-3.7.2/lib/python3.7/site-packages/hypothesis/extra/pytestplugin.py
flaky-3.5.3 at /home/gene/.pythonz/pythons/CPython-3.7.2/lib/python3.7/site-packages/flaky/flaky_pytest_plugin.py
Turning my comment into an answer: the easiest way is to print to stderr as doctest
only captures stdout for comparison. Example:
import sys
def greet(who):
"""Greet someone.
>>> greet('world')
'Hello world'
>>> greet('fizz')
'Hello fizz'
>>> greet('buzz')
'Hello buzz'
"""
print('input:', who, file=sys.stderr)
return f'Hello {who}'
Running the tests:
$ pytest --doctest-modules -sv
======================================= test session starts ========================================
...
collected 1 item
spam.py::spam.greet input: world
input: fizz
input: buzz
PASSED
===================================== 1 passed in 0.03 seconds =====================================
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