Builtin TestCase from python 3.8

First and foremost, congrats, I really like this library and looking forward to contribute and follow the path of its evolution. I embraced this library mostly because it is async and it resembles django so it was very easy to get started with.

Is your feature request related to a problem? Please describe. I am using tortoise with python 3.8, as of python 3.8 asyncio unittesting is possible without asynctest. https://docs.python.org/3/library/unittest.html#unittest.IsolatedAsyncioTestCase

There are also AsyncMock and patch supports async methods.

Describe the solution you’d like I would like not to include asynctest when using python3.8 and above.

Describe alternatives you’ve considered I have considered no other alternatives, but I am open to consider other alternatives.

Additional context I have been using a work around by copying some code from IsolatedTestCase

    async def asyncSetUp(self) -> None:
        config = generate_config(db_url='sqlite://:memory:', app_modules={'models': ['lib.models']})
        await Tortoise.init(config, _create_db=True)
        await Tortoise.generate_schemas(safe=False)
        self._connections = Tortoise._connections.copy()

    async def asyncTearDown(self) -> None:
        Tortoise._connections = self._connections.copy()
        await Tortoise._drop_databases()

        Tortoise.apps = {}
        Tortoise._connections = {}
        Tortoise._inited = False

I am open to open a PR with the fixes.

Another question, why the testing modules are in contrib? Testing is vital to every piece of software, is testing not fully supported or you are planning to change the api?

[long2ice]

see https://github.com/tortoise/tortoise-orm/pull/977

[WisdomPill]

Okay then I will have a try at creating a TestCase in tortoise.test_case, since there might be other testing frameworks that would need some kind of util like pytest or nose (I do not know, never used them, but in aiohttp they have some).