diff --git a/tests/test_config_wiring.py b/tests/test_config_wiring.py
index c7923d0..5b333fd 100644
--- a/tests/test_config_wiring.py
+++ b/tests/test_config_wiring.py
@@ -1029,6 +1029,8 @@ def __iter__(self):
                 return self
 
             def __next__(self):
+                if self.read_count >= 5:
+                    raise StopIteration
                 self.read_count += 1
                 return f"value-{self.read_count}"