avoid problems with trial and ENOSPC

I don't know if these will show up in this environment ... just copy/pasted
from the GitHub Actions config.

.circleci/config.yml

@@ -172,7 +172,13 @@ jobs:
       - "run":
           name: "Run Unit Tests"
           command: |
-            python -m tox -e py311-coverage
+            # On Windows, a non-blocking pipe might respond (when emulating
+            # Unix-y API) with ENOSPC to indicate buffer full. Trial doesn't
+            # handle this well, so it breaks test runs. To attempt to solve
+            # this, we pipe the output through passthrough.py that will
+            # hopefully be able to do the right thing by using Windows APIs.
+            python -m pip install twisted pywin32
+            python -m tox -e py311-coverage | python misc/windows-enospc/passthrough.py
 
       - "run":
           name: "Upload Coverage"