diff --git a/tests/unit/commands/test_cmdutils.py b/tests/unit/commands/test_cmdutils.py
index ef7c97164..718695874 100644
--- a/tests/unit/commands/test_cmdutils.py
+++ b/tests/unit/commands/test_cmdutils.py
@@ -376,6 +376,7 @@ class TestArgument:
         @cmdutils.register()
         def fun():
             # no docstring
+            pass
 
 
 class TestRun: