Update.

tests/conftest.py

@@ -1,4 +1,5 @@
 import pytest
+import pytest_asyncio
 import asyncio
 from tortoise import Tortoise
 
@@ -22,7 +23,7 @@ def event_loop():
     yield loop
     loop.close()
 
-@pytest.fixture(scope="session", autouse=True)
+@pytest_asyncio.fixture(scope="session", autouse=True)
 async def cleanup_db():
     yield
     await Tortoise.close_connections()