diff --git a/tests/test_ifs_sim.py b/tests/test_ifs_sim.py
index d08e0545435c3ed3d92de75b1432b4e30f509989..518a487f2fb7654cede90a5b474870694a886d55 100644
--- a/tests/test_ifs_sim.py
+++ b/tests/test_ifs_sim.py
@@ -49,7 +49,6 @@ class TestDemoFunction(unittest.TestCase):
 
         # result_path = dir_path+'ifs_sim_result'
         result_path = os.path.join(dir_path, 'ifs_sim_result')
-        
         csst_ifs_sim.runIFSsim(sourcein, configfile,
                                dir_path, result_path, 1, debug, 'no')