try to fix error where modules writing directly to sys.stdout.buffer blow up

[nchantarotwong]

Handle error case (due to using python-subunit + unittest-xml-reporting) where sys.stdout has no buffer attribute, causing a failure and hang in subunit:

protocol = TestProtocolServer(result, self._passthrough, self._forward)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/venv/lib/python3.11/site-packages/subunit/init.py", line 510, in init
stream = sys.stdout.buffer
^^^^^^^^^^^^^^^^^
AttributeError: '_DuplicateWriter' object has no attribute 'buffer'

This is due to python-subunit setting "stream = sys.stdout.buffer", but _DuplicateWriter() has no buffer attriibute. I tried handling this in a PR in python-subunit module, but they weren't really having it: testing-cabal/subunit#56

This works from what I can tell and doesn't seem to have negative side effects...
I also fixed tox.ini to work properly with Tox4, as it was not as-is.

test-results.zip

[nchantarotwong]

tests seem to have some sort of basic failure blocking the run, not having to do with my changes...
============================= test session starts ==============================
platform darwin -- Python 3.11.0, pytest-7.2.1, pluggy-1.0.0
cachedir: .tox/pytest/.pytest_cache
rootdir: /Users/nelschantarotwong/Downloads/unittest-xml-reporting-master, configfile: tox.ini, testpaths: tests
collected 89 items

tests/builder_test.py ........................ [ 26%]
tests/django_test.py ....... [ 34%]
tests/testsuite.py .F...........F......x................................ [ 94%]
..... [100%]

=================================== FAILURES ===================================
_____________ XMLTestRunnerTestCase.test_basic_unittest_constructs _____________

self = <tests.testsuite.XMLTestRunnerTestCase testMethod=test_basic_unittest_constructs>

def test_basic_unittest_constructs(self):
    suite = unittest.TestSuite()
    suite.addTest(self.DummyTest('test_pass'))
    suite.addTest(self.DummyTest('test_skip'))
    suite.addTest(self.DummyTest('test_fail'))
    suite.addTest(self.DummyTest('test_expected_failure'))
    suite.addTest(self.DummyTest('test_unexpected_success'))
    suite.addTest(self.DummyTest('test_error'))

  self._test_xmlrunner(suite)

tests/testsuite.py:255:

---

tests/testsuite.py:240: in _test_xmlrunner
runner.run(suite)
xmlrunner/runner.py:72: in run
result.printErrors()
E AttributeError: 'tuple' object has no attribute 'shortDescription'
________________ XMLTestRunnerTestCase.test_unexpected_success _________________

self = <tests.testsuite.XMLTestRunnerTestCase testMethod=test_unexpected_success>

def test_unexpected_success(self):
    suite = unittest.TestSuite()
    suite.addTest(self.DummyTest('test_unexpected_success'))
    outdir = BytesIO()

  self._test_xmlrunner(suite, outdir=outdir)

tests/testsuite.py:300:

---

tests/testsuite.py:240: in _test_xmlrunner
runner.run(suite)
xmlrunner/runner.py:72: in run
result.printErrors()
E AttributeError: 'tuple' object has no attribute 'shortDescription'
=============================== warnings summary ===============================
.tox/pytest/lib/python3.11/site-packages/django/http/request.py:1
/Users/nelschantarotwong/Downloads/unittest-xml-reporting-master/.tox/pytest/lib/python3.11/site-packages/django/http/request.py:1: DeprecationWarning: 'cgi' is deprecated and slated for removal in Python 3.13
import cgi

.tox/pytest/lib/python3.11/site-packages/django/utils/encoding.py:266
/Users/nelschantarotwong/Downloads/unittest-xml-reporting-master/.tox/pytest/lib/python3.11/site-packages/django/utils/encoding.py:266: DeprecationWarning: Use setlocale(), getencoding() and getlocale() instead
encoding = locale.getdefaultlocale()[1] or 'ascii'

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
=========================== short test summary info ============================
FAILED tests/testsuite.py::XMLTestRunnerTestCase::test_basic_unittest_constructs - AttributeError: 'tuple' object has no attribute 'shortDescription'
FAILED tests/testsuite.py::XMLTestRunnerTestCase::test_unexpected_success - AttributeError: 'tuple' object has no attribute 'shortDescription'
============= 2 failed, 86 passed, 1 xfailed, 2 warnings in 0.58s ==============
pytest: exit 1 (0.88 seconds) /Users/nelschantarotwong/Downloads/unittest-xml-reporting-master> pytest pid=73642
.pkg: _exit tests> python /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyproject_api/_backend.py True setuptools.build_meta legacy
pytest: FAIL code 1 (3.18=setup[2.31]+cmd[0.88] seconds)
evaluation failed :( (3.28 seconds)

[nchantarotwong]

Wondering if this is due to being on python 3.11. Tox test run seems to use this system version even if I setup my PyCharm virtual env to use a lower version.