diff --git a/tests/unit_tests.py b/tests/unit_tests.py
index 3677651..74ad73f 100644
--- a/tests/unit_tests.py
+++ b/tests/unit_tests.py
@@ -60,7 +60,7 @@ class UnitTests(unittest.TestCase):
     for building in self._city.buildings:
       result = Cost(building, retrofit_scenario=SYSTEM_RETROFIT_AND_PV).life_cycle
       self.assertIsNotNone(result)
-      self.assertEqual(0, result.values[0])
+      self.assertEqual(1, result.values[0])
 
   def test_scenario_3(self):
     for building in self._city.buildings: