Signature of create_superuser() not allways compatible with Django's own

[tiktuk]

I am trying to write a pytest test of one of my views that requires a logged-in admin user and I'm using the pytest-django admin_client fixture for that.

This fails as follows:

        try:
            user = UserModel._default_manager.get(**{username_field: username})
        except UserModel.DoesNotExist:
            extra_fields = {}
            if username_field not in ("username", "email"):
                extra_fields[username_field] = "admin"
            user = UserModel._default_manager.create_superuser(
>               username, "admin@example.com", "password", **extra_fields
            )
E           TypeError: create_superuser() takes 1 positional argument but 4 were given

../.virtualenvs/test3/lib/python3.7/site-packages/pytest_django/fixtures.py:298: TypeError

I investigated and it's because authtools defines create_superuser like this:

    def create_superuser(self, **kwargs):

using only one positional argument (self). The pytest-django fixture tries to invoke the function like Django expects up until 3.0, using username, email and password. In 3.0 only username is required so this problem might be solved but I'm on 2.2 and you seem to support 1.11 and maybe earlier too.

So is this a bug? I can work around it for now but thought I'd notify you. And thanks for a great package btw ☺️ .

[bgaudino]

Thanks for the issue and sorry for letting this sit for so long. We're unsure how to update this without breaking backwards compatibility, but we are open to ideas and PRs.