fix default loop scope

pyproject.toml

@@ -113,4 +113,4 @@ markers = [
     "manual: marks tests to be run only when manually directed to by the developer",
 ]
 asyncio_mode = "auto"
-asyncio_default_fixture_loop_scope="function"
+asyncio_default_fixture_loop_scope = "session"

tests/conftest.py

@@ -1,3 +1,4 @@
+import asyncio
 import copy
 import logging.config
 import shutil
@@ -23,6 +24,16 @@
 from tests.utils import idfn, path_resources
 
 
+@pytest.fixture(scope="session")
+def event_loop():
+    try:
+        loop = asyncio.get_running_loop()
+    except RuntimeError:
+        loop = asyncio.new_event_loop()
+    yield loop
+    loop.close()
+
+
 # noinspection PyUnusedLocal
 @pytest.hookimpl
 def pytest_configure(config: pytest.Config):