add auto asyncio mode for tests

Author: uruwhy

tox.ini

@@ -31,7 +31,7 @@ commands =
     python3 -m pip install -r /tmp/caldera/requirements.txt
     python3 -m pip install -r /tmp/caldera/requirements-dev.txt
     /usr/bin/cp -R {toxinidir} /tmp/caldera/plugins/emu
-    coverage run -p -m pytest --tb=short --rootdir=/tmp/caldera /tmp/caldera/plugins/emu/tests -W ignore::DeprecationWarning
+    coverage run -p -m pytest --tb=short --rootdir=/tmp/caldera --asyncio-mode=auto /tmp/caldera/plugins/emu/tests -W ignore::DeprecationWarning
 allowlist_externals =
     /usr/bin/git
     /usr/bin/cp