pytest - specify log level from the CLI command running the tests

Question

my team and I are using Pytest + Jenkins to automate our product testing. we have been using the standard Logging lib of python to get proper log messages during testing, before

Answer 1

Pytest 3.5 introduced a parameter

pytest --log-cli-level=INFO

For versions prior to 3.5 you can combine pytest commandline options and the python loglevel from commandline example to do the following:

Add the following to conftest.py:

import pytest
import logging


def pytest_addoption(parser):
    parser.addoption(
        "--log", action="store", default="WARNING", help="set logging level"
    )


@pytest.fixture
def logger():
    loglevel = pytest.config.getoption("--log")
    logger = logging.getLogger(__name__)

    numeric_level = getattr(
        logging,
        loglevel.upper(),
        None
    )
    if not isinstance(numeric_level, int):
        raise ValueError('Invalid log level: %s' % loglevel)

    logger.setLevel(numeric_level)
    return logger

and then request the logger fixture in your tests

def test_bla(logger):
    assert True
    logger.info("True is True")

Then run pytest like

py.test --log INFO

to set the log level to INFO.