py.test logging control

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We have recently switched to py.test for python testing (which is fantastic btw). However, I'm trying to figure out how to control the log output (i.e. the built-in python logging module). We have pytest-capturelog installed and this works as expected and when we want to see logs we can pass --nologcapture option.

However, how do you control the logging level (e.g. info, debug etc.) and also filter the logging (if you're only interested in a specific module). Is there existing plugins for py.test to achieve this or do we need to roll our own?

Thanks, Jonny

pytest python
5 Answers

Pytest now has native support for logging control via the caplog fixture; no need for plugins.

You can specify the logging level for a particular logger or by default for the root logger:

import pytest

def test_bar(caplog):
    caplog.set_level(logging.CRITICAL, logger='root.baz')

Pytest also captures log output in caplog.records so you can assert logged levels and messages. For further information see the official documentation here and here.

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