add asyncio plugin

Author: D34DC3N73R

tests/conftest.py

@@ -1,7 +1,8 @@
 """Fixtures for tests"""
 import pytest
+import asyncio
 
-pytest_plugins = "pytest_homeassistant_custom_component"
+pytest_plugins = ("pytest_homeassistant_custom_component", "pytest_asyncio")
 
 
 @pytest.fixture(autouse=True)