[test_ModelicaSystemCmd] fix test

Author: syntron

tests/test_ModelicaSystemCmd.py

@@ -18,7 +18,11 @@ def model_firstorder(tmp_path):
 @pytest.fixture
 def mscmd_firstorder(model_firstorder):
     mod = OMPython.ModelicaSystem(fileName=model_firstorder.as_posix(), modelName="M")
-    mscmd = OMPython.ModelicaSystemCmd(runpath=mod.getWorkDirectory(), modelname=mod._model_name)
+    mscmd = OMPython.ModelicaSystemCmd(
+        session=mod._getconn,
+        runpath=mod.getWorkDirectory(),
+        modelname=mod._model_name,
+    )
     return mscmd