Add Django main to tox envlist.

[hramezani]

No description provided.

[hramezani]

@bluetech again we have a problem in testing with django main. Here is the error log:

request = <SubRequest '_django_db_marker' for <Function test_databases>>

    @pytest.fixture(autouse=True)
    def _django_db_marker(request) -> None:
        """Implement the django_db marker, internal to pytest-django.
    
        This will dynamically request the ``db``, ``transactional_db`` or
        ``django_db_reset_sequences`` fixtures as required by the django_db marker.
        """
        marker = request.node.get_closest_marker("django_db")
        if marker:
            transaction, reset_sequences, databases = validate_django_db(marker)
    
            # TODO: Use pytest Store (item.store) once that's stable.
            request.node._pytest_django_databases = databases
    
            if reset_sequences:
                request.getfixturevalue("django_db_reset_sequences")
            elif transaction:
                request.getfixturevalue("transactional_db")
            else:
>               request.getfixturevalue("db")

pytest_django/plugin.py:472: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
pytest_django/fixtures.py:254: in db
    _django_db_fixture_helper(request, django_db_blocker, transactional=False)
pytest_django/fixtures.py:177: in _django_db_fixture_helper
    PytestDjangoTestCase.setUpClass()
.tox/py39-djmain-sqlite-coverage/lib/python3.9/site-packages/django/test/testcases.py:1173: in setUpClass
    cls.cls_atomics = cls._enter_atomics()
.tox/py39-djmain-sqlite-coverage/lib/python3.9/site-packages/django/test/testcases.py:1150: in _enter_atomics
    atomics[db_name].__enter__()
.tox/py39-djmain-sqlite-coverage/lib/python3.9/site-packages/django/db/transaction.py:189: in __enter__
    if not connection.get_autocommit():
.tox/py39-djmain-sqlite-coverage/lib/python3.9/site-packages/django/db/backends/base/base.py:400: in get_autocommit
    self.ensure_connection()
.tox/py39-djmain-sqlite-coverage/lib/python3.9/site-packages/django/utils/asyncio.py:25: in inner
    return func(*args, **kwargs)
.tox/py39-djmain-sqlite-coverage/lib/python3.9/site-packages/django/db/backends/base/base.py:230: in ensure_connection
    self.connect()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <django.test.testcases._DatabaseFailure object at 0x7fafe41d8670>

    def __call__(self):
>       raise AssertionError(self.message)
E       AssertionError: Database connections to 'replica' are not allowed in this test. Add 'replica' to pytest_django.fixtures._django_db_fixture_helper.<locals>.PytestDjangoTestCase.databases to ensure proper test isolation and silence this failure.

I've checked the _django_db_fixture_helper function and it seems it sets PytestDjangoTestCase.databases correctly.
We can see this behaviour after this commit in Django django/django@faba5b7
Do you have any idea?

[bluetech]

Thanks for the PR @hramezani! It might take me a while to look at the failure, but I'll definitely check it out. From the error it is related to the experimental multi-db support, which also causes some (flaky?) sqlite failures in other PRs. Any investigation you can make (e.g. what changed in that django commit) would be great.

[hramezani]

@bluetech I think we had a problem with Django main because they removed SimpleTestCase.tearDownClass in django/django@faba5b7.

I've added it to PytestDjangoTestCase and made it available for Django >- 4.0

Also, it seems we have a problem with Github action.

[bluetech]

Does the following work, instead of copying django_tear_down_class over?

Suggested change

	request.addfinalizer(PytestDjangoTestCase.django_tear_down_class)
	request.addfinalizer(PytestDjangoTestCase.doClassCleanups)

[hramezani]

Yes, perfect!

[hramezani]

Not sure py35-dj22-postgres-pytest54-coverage fails related to this patch or not.

[bluetech]

Not sure py35-dj22-postgres-pytest54-coverage fails related to this patch or not.

No, it looks like more-itertools/more-itertools#578, which will hopefully resolve itself.

[bluetech]

Thanks @hramezani! I will be aiming for a release this weekend.