diff --git a/tests/test_ifs_sim.py b/tests/test_ifs_sim.py
index f2e640ca0e372e75c8b40728e15e01e7e858bfa2..5b4ea947352479d2bcc82e322272f12dc9e092fe 100644
--- a/tests/test_ifs_sim.py
+++ b/tests/test_ifs_sim.py
@@ -13,6 +13,7 @@ import unittest
 import os
 from csst_ifs_sim import csst_ifs_sim
 import subprocess
+import sys
 
 class TestDemoFunction(unittest.TestCase):
     def test_ifs_sim_1(self):
@@ -33,6 +34,7 @@ class TestDemoFunction(unittest.TestCase):
         # demo function test
         dir_path = os.path.join(os.environ['UNIT_TEST_DATA_ROOT'],'ifs_sim/')
         print(dir_path)
+        print(sys.version )
         ###configfile = dir_path+'IFS_inputdata/configData/IFS_sim_C90.config'
         
         configfile = './ifs_data/IFS_sim_C90.config'