pytest-django-asyncio 0.2.0

Temporary pytest plugin backport for async Django DB fixture handling.

pytest-django-asyncio

pytest-django-asyncio is a small temporary compatibility plugin for projects that need async Django ORM access to work correctly with pytest-django database fixtures before the equivalent upstream support lands.

It backports the async database fixture behavior proposed in pytest-django PR #1223 and exposes it as an installed pytest plugin through pytest11, so downstream projects get the fix automatically after installation.

I'll deprecate it from pypi once the linked MR gets merged into pytest-django.

What does this fix/why do tests fail in async contexts?

pytest-django's normal db fixture wraps each test in a transaction and rolls it back afterwards. In async tests, Django's async ORM work runs via sync_to_async on a dedicated thread, so the transaction setup and teardown also need to happen on that thread or database state can escape the rollback boundary.

This package backports the fixture split and async helper approach from pytest-django PR #1223 so async tests marked with @pytest.mark.asyncio can use Django DB fixtures safely when this plugin is installed as a normal dependency.

Installation

pip install pytest-django-asyncio

You still need the usual pytest stack in the consuming project:

• pytest
• pytest-django
• pytest-asyncio
• Django

Usage

After installation, pytest auto-loads the plugin through its pytest11 entry point. That means it should be ready to go as long as you have the package installed in your python environment.

Typical usage:

import pytest


@pytest.mark.asyncio
@pytest.mark.django_db
async def test_async_orm_works():
    ...

The same backport also works when tests request db or transactional_db directly.

Caveats

• If a project disables pytest plugin auto-loading, it must explicitly add pytest_django_asyncio.pytest_plugin to its plugin list.

How It Works

The package exposes a thin pytest_plugin.py entry module. During pytest_configure, it applies the small DjangoDbBlocker.unblock(async_only=...) backport needed by the async path and then registers the real fixture override module late with @pytest.hookimpl(trylast=True).

That late registration lets this package's _django_db_helper override win over pytest-django.

The sync path delegates back to pytest-django; the async path uses a separate helper modeled on pytest-django PR #1223: the transaction start/stop run in the same async worker thread that will execute the actual test, using async_to_sync.