diff --git a/business_logic_test.py b/business_logic_test.py
index 2719cf0..957c556 100644
--- a/business_logic_test.py
+++ b/business_logic_test.py
@@ -390,7 +390,8 @@ def test_fixed_amount_discount(self):
     )
     self.assertEqual(
       discounts_obj.applied[0].amount,
-      500,
+      expected_discount,
+      "applied discount amount must match the configured fixed reduction",
     )
 
   def test_buyer_consent(self):