Workaround for python/cpython#138720

Author: markqvist

tests/channel.py

@@ -415,7 +415,7 @@ def write_thread():
             nonlocal count, write_finished
             count = writer.write(data.encode("utf-8"))
             writer.flush()
-            writer.close()
+            # writer.close() # TODO: Temporary workaround for https://github.com/python/cpython/issues/138720
             write_finished = True
         threading.Thread(target=write_thread, name="Write Thread", daemon=True).start()