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 (ie 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 (eg 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
Installing and using the pytest-capturelog plugin could satisfy most of your pytest/logging needs. If something is missing you should be able to implement it relatively easily.
As Holger said you can use pytest-capturelog :
def test_foo(caplog):
caplog.setLevel(logging.INFO)
pass
If you don't want to use pytest-capturelog you can use a stdout StreamHandler in your logging config so pytest will capture the log output. Here is an example basicConfig
logging.basicConfig(level=logging.DEBUG, stream=sys.stdout)
A bit of a late contribution, but I can recommend pytest-logging for a simple drop-in logging capture solution. After pip install pytest-logging
you can control the verbosity of the your logs (displayed on screen) with
$ py.test -s -v tests/your_test.py
$ py.test -s -vv tests/your_test.py
$ py.test -s -vvvv tests/your_test.py
etc... NB - the -s
flag is important, without it py.test
will filter out all the sys.stderr
information.
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 .
A bit of an even later contribution: you can try pytest-logger . Novelty of this plugin is logging to filesystem: pytest provides nodeid for each test item, which can be used to organize test session logs directory (with help of pytest tmpdir facility and it's testcase begin/end hooks).
You can configure multiple handlers (with levels) for terminal and filesystem separately and provide own cmdline options for filtering loggers/levels to make it work for your specific test environment - eg by default you can log all to filesystem and small fraction to terminal, which can be changed on per-session basis with --log
option if needed. Plugin does nothing by default, if user defines no hooks.
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