Using pytest fixture with asynctest

I am using asynctest and I want to leverage pytest fixture. I'm intersted by (but not only) the caplog fixture.

In an asynctest testing class, I can use with self.assertLogs(): but this is not sufficient when my logs are not produced within the block.

import asyncio
import logging
import asynctest


async def worker():
    logging.error(":(")


class TestClass(asynctest.TestCase):
    """Testing class. """

    async def setUp(self):
        self.worker_task = asyncio.ensure_future(worker())

    async def tearDown(self):
        try:
            self.worker_task.cancel()
        except asyncio.CancelledError:
            pass

    async def test_get_error_log(self):
        """ Simple test that assert logs emitted. """
        with self.assertLogs(level="ERROR") as cm:
            await asyncio.sleep(1)

The test above if failing but if I have:

---------- Captured log call -----------
ERROR    root:tmp.py:7 :(