Finally, I'm down to only a single issue, and that's probably one of the only remaining problems I have in Stein:

======================================================================
FAIL: oslo_middleware.tests.test_healthcheck.HealthcheckTests.test_json_response
oslo_middleware.tests.test_healthcheck.HealthcheckTests.test_json_response
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/<<PKGBUILDDIR>>/oslo_middleware/tests/test_healthcheck.py", line 202, in test_json_response
    accept='application/json')
  File "/<<PKGBUILDDIR>>/oslo_middleware/tests/test_healthcheck.py", line 81, in _do_test
    self.assertEqual(expected_body, res.body)
  File "/usr/lib/python3/dist-packages/testtools/testcase.py", line 411, in assertEqual
    self.assertThat(observed, matcher, message)
  File "/usr/lib/python3/dist-packages/testtools/testcase.py", line 498, in assertThat
    raise mismatch_error
testtools.matchers._impl.MismatchError: !=:
reference = b'''\
{
    "detailed": false,
    "reasons": []
}'''
actual    = b'''\
{
    "detailed": true,
    "gc": {
        "counts": [
            98,
            0,
            1
        ],
        "threshold": [
            700,
            10,
            10
        ]
    },
    "greenthreads": [],
    "now": "2019-04-05 22:12:12.946896",
    "platform": "Linux-4.19.0-4-amd64-x86_64-with-debian-buster-sid",
    "python_version": "3.7.3 (default, Apr  3 2019, 05:39:12) \\n[GCC 8.3.0]",
    "reasons": [],
    "threads": [
        "  File \\"/usr/lib/python3.7/runpy.py\\", line 193, in _run_module_as_main\\n    \\"__main__\\", mod_spec)\\n  File \\"/usr/lib/python3.7/runpy.py\\", line 85, in _run_code\\n    exec(code, run_globals)\\n  File \\"/usr/lib/python3/dist-packages/subunit/run.py\\", line 149, in <module>\\n    main()\\n  File \\"/usr/lib/python3/dist-packages/subunit/run.py\\", line 145, in main\\n    stdout=stdout, exit=False)\\n  File \\"/usr/lib/python3/dist-packages/testtools/run.py\\", line 187, in __init__\\n    self.runTests()\\n  File \\"/usr/lib/python3/dist-packages/testtools/run.py\\", line 221, in runTests\\n    self.result = testRunner.run(self.test)\\n  File \\"/usr/lib/python3/dist-packages/subunit/run.py\\", line 70, in run\\n    test(result)\\n  File \\"/usr/lib/python3.7/unittest/suite.py\\", line 84, in __call__\\n    return self.run(*args, **kwds)\\n  File \\"/usr/lib/python3.7/unittest/suite.py\\", line 122, in run\\n    test(result)\\n  File \\"/usr/lib/python3/dist-packages/unittest2/suite.py\\", line 87, in __call__\\n    return self.run(*args, **kwds)\\n  File \\"/usr/lib/python3/dist-packages/unittest2/suite.py\\", line 126, in run\\n    test(result)\\n  File \\"/usr/lib/python3/dist-packages/unittest2/suite.py\\", line 87, in __call__\\n    return self.run(*args, **kwds)\\n  File \\"/usr/lib/python3/dist-packages/unittest2/suite.py\\", line 126, in run\\n    test(result)\\n  File \\"/usr/lib/python3/dist-packages/unittest2/suite.py\\", line 87, in __call__\\n    return self.run(*args, **kwds)\\n  File \\"/usr/lib/python3/dist-packages/unittest2/suite.py\\", line 126, in run\\n    test(result)\\n  File \\"/usr/lib/python3/dist-packages/unittest2/case.py\\", line 673, in __call__\\n    return self.run(*args, **kwds)\\n  File \\"/usr/lib/python3/dist-packages/testtools/testcase.py\\", line 671, in run\\n    return run_test.run(result)\\n  File \\"/usr/lib/python3/dist-packages/testtools/runtest.py\\", line 80, in run\\n    return self._run_one(actual_result)\\n  File \\"/usr/lib/python3/dist-packages/testtools/runtest.py\\", line 94, in _run_one\\n    return self._run_prepared_result(ExtendedToOriginalDecorator(result))\\n  File \\"/usr/lib/python3/dist-packages/testtools/runtest.py\\", line 108, in _run_prepared_result\\n    self._run_core()\\n  File \\"/usr/lib/python3/dist-packages/testtools/runtest.py\\", line 144, in _run_core\\n    self.case._run_test_method, self.result):\\n  File \\"/usr/lib/python3/dist-packages/testtools/runtest.py\\", line 191, in _run_user\\n    return fn(*args, **kwargs)\\n  File \\"/usr/lib/python3/dist-packages/testtools/testcase.py\\", line 719, in _run_test_method\\n    return self._get_test_method()()\\n  File \\"/<<PKGBUILDDIR>>/oslo_middleware/tests/test_healthcheck.py\\", line 202, in test_json_response\\n    accept='application/json')\\n  File \\"/<<PKGBUILDDIR>>/oslo_middleware/tests/test_healthcheck.py\\", line 79, in _do_test\\n    server_port=server_port)\\n  File \\"/<<PKGBUILDDIR>>/oslo_middleware/tests/test_healthcheck.py\\", line 70, in _do_test_request\\n    res = req.get_response(self.app)\\n  File \\"/usr/lib/python3/dist-packages/webob/request.py\\", line 1314, in send\\n    application, catch_exc_info=False)\\n  File \\"/usr/lib/python3/dist-packages/webob/request.py\\", line 1278, in call_application\\n    app_iter = application(self.environ, start_response)\\n  File \\"/usr/lib/python3/dist-packages/webob/dec.py\\", line 129, in __call__\\n    resp = self.call_func(req, *args, **kw)\\n  File \\"/usr/lib/python3/dist-packages/webob/dec.py\\", line 193, in call_func\\n    return self.func(req, *args, **kwargs)\\n  File \\"/<<PKGBUILDDIR>>/oslo_middleware/base.py\\", line 128, in __call__\\n    response = self.process_request(req)\\n  File \\"/usr/lib/python3/dist-packages/webob/dec.py\\", line 146, in __call__\\n    return self.call_func(req, *args, **kw)\\n  File \\"/usr/lib/python3/dist-packages/webob/dec.py\\", line 193, in call_func\\n    return self.func(req, *args, **kwargs)\\n  File \\"/<<PKGBUILDDIR>>/oslo_middleware/healthcheck/__init__.py\\", line 559, in process_request\\n    body, content_type = functor(results, healthy)\\n  File \\"/<<PKGBUILDDIR>>/oslo_middleware/healthcheck/__init__.py\\", line 501, in _make_json_response\\n    body['threads'] = self._get_threadstacks()\\n  File \\"/<<PKGBUILDDIR>>/oslo_middleware/healthcheck/__init__.py\\", line 442, in _get_threadstacks\\n    traceback.print_stack(stack, file=buf)\\n"
    ]
}'''


----------------------------------------------------------------------
Ran 101 tests in 2.569s

FAILED (failures=1)