pytest regression with logging and doctests

mypackage.py

import logging


def myfunc(a, b, c, d, logger=None):
    """My func is super awesome.

    Example:
        >>> import logging, sys
        >>> logging.basicConfig(stream=sys.stdout, level=logging.DEBUG, format="%(levelname)s: %(message)s")
        >>> myfunc(1, 2, 3, 4)
        DEBUG: a=1, b=2, c=3, d=4, result=10
        10
    """
    if logger is None:
        logger = logging.getLogger()
    result = a + b + c + d
    logger.debug("a=%r, b=%r, c=%r, d=%r, result=%r", a, b, c, d, result)
    return result

output-pytest-3.2.5.txt

=========================================================================
 Running with doctest
=========================================================================
 Running with unittest
..
----------------------------------------------------------------------
Ran 2 tests in 0.001s

OK
=========================================================================
 Running with pytest
============================= test session starts ==============================
platform linux -- Python 3.6.5, pytest-3.2.5, py-1.5.3, pluggy-0.4.0
rootdir: /home/paulius/Projects/experiments/doctests, inifile:
collected 2 items

mypackage.py .
test_mypackage.py .

=========================== 2 passed in 0.02 seconds ===========================

output-pytest-3.5.0.txt

=========================================================================
 Running with doctest
=========================================================================
 Running with unittest
..
----------------------------------------------------------------------
Ran 2 tests in 0.001s

OK
=========================================================================
 Running with pytest
============================= test session starts ==============================
platform linux -- Python 3.6.5, pytest-3.5.0, py-1.5.3, pluggy-0.6.0
rootdir: /home/paulius/Projects/experiments/doctests, inifile:
collected 2 items

mypackage.py F                                                           [ 50%]
test_mypackage.py .                                                      [100%]

=================================== FAILURES ===================================
__________________________ [doctest] mypackage.myfunc __________________________
005 My func is super awesome.
006 
007     Example:
008         >>> import logging, sys
009         >>> logging.basicConfig(
010         ...     stream=sys.stdout,
011         ...     level=logging.DEBUG,
012         ...     format="%(levelname)s: %(message)s")
013         >>> myfunc(1, 2, 3, 4)
Expected:
    DEBUG: a=1, b=2, c=3, d=4, result=10
    10
Got:
    10

/home/paulius/Projects/experiments/doctests/mypackage.py:13: DocTestFailure
====================== 1 failed, 1 passed in 0.01 seconds ======================

run.sh

#!/usr/bin/env bash
# ./run.sh > output-pytest-<pytest version>.txt 2>&1
echo "========================================================================="
echo " Running with doctest"
python -m doctest *.py
echo "========================================================================="
echo " Running with unittest"
python -m unittest *.py
echo "========================================================================="
echo " Running with pytest"
python -m pytest --doctest-modules *.py

test_mypackage.py

import doctest
import unittest

import mypackage


def load_tests(loader, tests, ignore):
    tests.addTests(doctest.DocTestSuite(mypackage))
    return tests


class MyPackageTests(unittest.TestCase):
    def test_myfunc_returns_sum(self):
        self.assertEqual(mypackage.myfunc(1, 2, 3, 4), 10)