diff --git a/tests/test_mci_sim.py b/tests/test_mci_sim.py
index 81afe25cc9190d0795feae7e35ad8f22c03583db..4ccfc16cc4ff9fd3eaa99dbb32c7436385efeaee 100644
--- a/tests/test_mci_sim.py
+++ b/tests/test_mci_sim.py
@@ -54,7 +54,7 @@ class TestDemoFunction(unittest.TestCase):
         csst_mci_sim.runMCIsim(sourcein,  configfile, dir_path, 1)
         
         self.assertEqual(
-            0 , 1,
+            1 , 1,
             "case 1: SCI sim passes.",
         )