basicConfig settings overlap from separate tests

[r0fls]

When using logging basicConfig in two tests in the same suite, the settings seem to overlap and interfere with each other.

I'm using pytest version 3.0.4 on Mac OSX Sierra

Here is a minimal example:

Create the following two files:

test_1.py

import logging

logging.basicConfig()
log = logging.getLogger()
def test_foo():
    foo = 1
    log.warn(foo)
    assert foo == 1

test_2.py

from io import StringIO
import logging

log_stream = StringIO()

def test_log():
    logging.basicConfig(stream=log_stream, level=logging.INFO)
    log = logging.getLogger()
    log.warn('test')
    assert log_stream.getvalue() == 'WARNING:root:test\n'

Then run python3 -m pytest -v. Note that running each test individually works. The settings should not interfere, since they are in separate files.

[nicoddemus]

As discussed in #2159, the recommendation (at least for now) is to use the pytest-catchlog plugin.