Add logging to TAP file

[codambro]

resolves #91

This is based off the existing pytest JUnit logging support.

--tap-logging 'all'

1..6
ok 1 test_logging.py::test_ok
not ok 2 test_logging.py::test_not_ok
# def test_not_ok():
#         LOGGER.error("Running test_not_ok")
# >       assert False
# E       assert False
# 
# test_logging.py:12: AssertionError
# --- Captured Log ---
# ERROR    test_logging:test_logging.py:11 Running test_not_ok
# --- Captured Out ---
# 
# --- Captured Err ---
#
ok 3 test_logging.py::test_params[foo]
ok 4 test_logging.py::test_params[bar]

NOTE: Have PR to add logging to passing tests, but that requires an update to tappy.
tappy PR - python-tap/tappy#148
pytest-tap PR - codambro#1

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[codambro]

@mblayman Could I get a review on this? I can't seem to request reviewers on this repo

[mblayman]

This looks pretty decent to me. Config options are forever, practically, so I'd like to avoid adding one of these.

[codambro]

Believe it is ready to re-review. Some concern as the default behavior in pytest is for --show-capture=all. Meaning anybody using pytest-tap will now by default have log/out/err all added to failing test diagnostics. I don't know if there is a case where a user may want the TAP result file to be kept minimal, whereas they have a separate log file with all the test output. By combining it with --show-capture, they no longer can separate them.

I'm also considering to make these ini config options (via addini) as opposed to command line args. Since that's how JUnit result files are configured.

[mblayman]

Some concern as the default behavior in pytest is for --show-capture=all.

I'm not concerned. The library makes no promises about what diagnostics it outputs. This configuration lines up with the default pytest behavior, which feels good to me.

[mblayman]

Thanks for the contribution! 👍