Define asyncio_default_fixture_loop_scope

Change-Id: I89ce120c918aa3b3d28e6f32c3cc5833b474db23
diff --git a/pyproject.toml b/pyproject.toml
index eff2365..388a54a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,3 +42,6 @@
 
 [tool.pdm]
 distribution = true
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+asyncio_default_fixture_loop_scope = "session"