test_lazy fails if django is installed

[mgorny]

I'm getting the following test failure if django is installed on the system:

=============================================================== test session starts ===============================================================
platform linux -- Python 3.9.0b4, pytest-4.6.11, py-1.8.0, pluggy-0.13.1
rootdir: /tmp/six, inifile: setup.cfg
plugins: pyfakefs-3.7.2, flaky-3.7.0, hypothesis-4.57.1
collected 200 items                                                                                                                               

test_six.py ........F.............................................sssssssssssssss.......................................................... [ 63%]
.........................................................................                                                                   [100%]

==================================================================== FAILURES =====================================================================
____________________________________________________________________ test_lazy ____________________________________________________________________

    def test_lazy():
        if six.PY3:
            html_name = "html.parser"
        else:
            html_name = "HTMLParser"
>       assert html_name not in sys.modules
E       AssertionError: assert 'html.parser' not in {'__future__': <module '__future__' from '/usr/lib/python3.9/__future__.py'>, '__main__': <module '__main__' from '/usr/lib/python-exec/python3.9/pytest'>, '_abc': <module '_abc' (built-in)>, '_ast': <module '_ast' (built-in)>, ...}
E        +  where {'__future__': <module '__future__' from '/usr/lib/python3.9/__future__.py'>, '__main__': <module '__main__' from '/usr/lib/python-exec/python3.9/pytest'>, '_abc': <module '_abc' (built-in)>, '_ast': <module '_ast' (built-in)>, ...} = sys.modules

test_six.py:94: AssertionError
================================================ 1 failed, 184 passed, 15 skipped in 0.66 seconds =================================================

Apparently, django is loaded somehow, and it causes html.parser module to be loaded. Maybe the initial assert could be replaced by skipping the test?

[mgorny]

This is with fresh git (c0be881) and django-3.0.8.