update setup.py

tests/test_ifs_sim.py

@@ -12,7 +12,7 @@ Modified-History:
 import unittest
 import os
 from csst_ifs_sim import csst_ifs_sim
-
+import subprocess
 
 class TestDemoFunction(unittest.TestCase):
     def test_ifs_sim_1(self):
@@ -37,7 +37,9 @@ class TestDemoFunction(unittest.TestCase):
         
         d=1
         
-        csst_ifs_sim(dir_path)
+        subprocess.run('csst_ifs_sim', dir_path)
+        
+        #csst_ifs_sim dir_path
         
         self.assertEqual(
             d , 1,