Show logging output when using pytest

A code example and steps to reproduce would be very helpful in identifying the issue

here is the test code:

import logging
logger = logging.getLogger(__name__)


def test_logging():
    for i in range(10**2):
        print('aaa')
        logger.critical('bbb')
        logger.debug('ccc')
    assert True

I cannot see the print and logger output until the test is over. In practice, I need to see all of them real time

I would say a more proper-ish way would be to log into a file and then tail it. That's what logging is used for, otherwise just use prints.

import logging

logging.basicConfig(
    filename='test.log',
    filemode='w',
    level=logging.ERROR,
    format = '%(asctime)s - %(levelname)s: %(message)s',
)

def test_logging():
    for i in range(10**2):
        print('aaa')
        logging.critical('bbb')
        logging.debug('ccc')
    assert True

Hi Andrey,

agree in general with your comment about logging usage, but using logging as if it is print during development is really helpful...

In fact I found out that it's a supported feature by pytest https://docs.pytest.org/en/latest/logging.html#live-logs .

By creating a pytest.ini file with this content:

[pytest]
log_cli = true

and adding this parameter

--log-cli-level=10

to pytest run configuration, I got what I wanted :)

> I would say a more proper-ish way would be to log into a file and then tail it

No, it wouldn't

Because logging may be setted up differently in test and production environments

Pytest captures your output and your logging to display it only when your test fails. It's not a bug, it's a feature (although an unwanted one as far as I'm concerned)

You can disable the stdout/stderr capture with `-s` and disable the logs capture with `-p no:logging`. Then you will see the test output and the test logs in real time.

You can disable the stdout/stderr capture with `-s`

How?

I am trying to avoid running from command line, which is why I am using Pycharm.

How to do this with pycharm?

Also, how to allow all pipes to be dumped to console? I see stderr doesn't work when only the .ini file is added.

Noamzilo  You can add `-p no:logging -s` to "Additional Arguments" in your Run Configuration or Run Configuration Template for pytest.

I'm usign the pytest.ini file to configure the live log.

Unfortunatly with live log enable, pycharm get confused and is not able to understand properly the test results into the tree:

For example: I run 13 tests into a package and all of the always succeds. Without live log enable Pycharm correctly report: "Tests passed: 13 of 13 tests". With live log enable, Pycharm report is unpredittable.

This is without live log enable

This with livelog enable:

I have added the white area just to suppress sensitive data, sorry.

Can you fix this bug?