diff --git a/tests/test_factor_rules.py b/tests/test_factor_rules.py
index 557c7eb5..6ed6c5e9 100644
--- a/tests/test_factor_rules.py
+++ b/tests/test_factor_rules.py
@@ -282,6 +282,15 @@ class FactorRulesPathTests(unittest.TestCase):
         self.assertIn("Rule 1: Rule 1", summary)
         self.assertIn("- Signal bias: neutral", summary)
 
+    def test_summarize_factor_rules_preserves_zero_weight_value(self):
+        summary = summarize_factor_rules(
+            [{"name": "Carry", "signal": "neutral", "weight": 0}],
+            ticker="USO",
+            trade_date="2026-03-07",
+        )
+
+        self.assertIn("- Weight: 0", summary)
+
 
 if __name__ == "__main__":
     unittest.main()