logging not captured with pytest 3.3 and xdist

(Moved from pytest-dev/pytest-xdist#256)

Consider this file:

import logging
logger = logging.getLogger(__name__)

def test():
	logger.warn('Some warning')

When executing pytest foo.py -n2, the warning is printed to the console:

============================= test session starts =============================
platform win32 -- Python 3.5.0, pytest-3.3.1, py-1.5.2, pluggy-0.6.0
rootdir: C:\Users\bruno, inifile:
plugins: xdist-1.20.1, forked-0.2
gw0 [1] / gw1 [1]
scheduling tests via LoadScheduling
foo.py                       6 WARNING  Some warning
.                                                                        [100%]
========================== 1 passed in 0.65 seconds ===========================

Executing pytest normally without the -n2 flags then the message is not printed.

Using pytest 3.3.1 and xdist 1.20.1.

[thisch]

On Mon, Jul 9, 2018 at 1:14 PM Attila [e-mail] wrote:

BTW if anyone knows how to add millisecs to log_date_format, it would be welcome. %f does not seem to work (using pytest 3.6.3). Hope this helps.

You can use “'%(asctime)s.%(msecs)03d” in your log_format. HTH ’

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[attila123]

For new users of pytest (maybe coming here googling why their logs are not displayed when testing): based on https://docs.pytest.org/en/latest/logging.html I made this pytest.ini file, with which pytest will output all log messages (in a nicely formatted way).

[pytest]
log_cli=true
log_level=NOTSET
log_format = %(asctime)s %(levelname)s (%(threadName)-10s) %(filename)s:%(lineno)d %(message)s
log_date_format = %Y-%m-%d %H:%M:%S

BTW if anyone knows how to add millisecs to log_date_format, it would be welcome. %f does not seem to work (using pytest 3.6.3). This does not require any command line option for pytest to work. However I found -v adds some nice green “PASSED” etc. results. Hope this helps.