diff --git a/tests/test_list.py b/tests/test_list.py
index 6978ef4..b7365c4 100644
--- a/tests/test_list.py
+++ b/tests/test_list.py
@@ -2,6 +2,7 @@
 Tests for /list route
 '''
 from types import SimpleNamespace
+from subprocess import CalledProcessError
 
 
 _PF_TABLE_LIST = b'''   192.0.2.66
@@ -93,6 +94,8 @@ def test_list_nonexistent_table(client, mocker, valid_credentials):
     run_res.returncode = 255
     run_res.check_returncode = noop
 
+    # XXX raise a CalledProcessError here...
+
     mocker.patch('jail2ban.pfctl.run', return_value=run_res)
 
     response = client.get("/list/nonexistent",