Fixes for aioca 1.8.*

Author: AlexanderWells-diamond

tests/conftest.py

@@ -6,6 +6,7 @@
 import string
 import subprocess
 import sys
+from packaging.version import Version
 from typing import Any
 import pytest
 
@@ -73,12 +74,19 @@ def cothread_ioc():
 
 
 def aioca_cleanup():
-    from aioca import purge_channel_caches, _catools
+    from aioca import purge_channel_caches, _catools, __version__
     # Unregister the aioca atexit handler as it conflicts with the one installed
     # by cothread. If we don't do this we get a seg fault. This is not a problem
     # in production as we won't mix aioca and cothread, but we do mix them in
     # the tests so need to do this.
-    atexit.unregister(_catools._Context._destroy_context)
+    # In aioca 1.8 the name of the function changed, but it also dropped support
+    # for Python 3.7. Once we drop that Python version we can remove this check.
+    if Version(__version__) >= Version("1.8"):
+        unregister_func = _catools._Context._teardown
+    else:
+        unregister_func = _catools._Context._destroy_context
+
+    atexit.unregister(unregister_func)
     # purge the channels before the event loop goes
     purge_channel_caches()