Port regression test ticket 737 to Pytests

testsuite/pytests/sli2py_regressions/test_ticket_737.py

@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+#
+# test_ticket_737.py
+#
+# This file is part of NEST.
+#
+# Copyright (C) 2004 The NEST Initiative
+#
+# NEST is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# NEST is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with NEST.  If not, see <http://www.gnu.org/licenses/>.
+
+import nest
+import pytest
+
+SKIP_LIST = ["step_rate_generator"]
+
+# Get all stimulator models
+stimulators = [
+    m for m in nest.node_models if m not in SKIP_LIST and nest.GetDefaults(m).get("element_type") == "stimulator"
+]
+
+
+@pytest.mark.parametrize("stim_model", stimulators)
+def test_multiple_static_synapse_connections(stim_model):
+    """
+    Regression test for Ticket #737.
+
+    Ensure that stimulation devices can only be connected with a single synapse type.
+    """
+    # First test: multiple connections with same type (static_synapse)
+    nest.ResetKernel()
+    stim = nest.Create(stim_model)
+    n = nest.Create("iaf_psc_alpha")
+    nest.Connect(stim, n, "all_to_all", syn_spec="static_synapse")
+    nest.Connect(stim, n, "all_to_all", syn_spec="static_synapse")
+
+    # Second test: multiple connections of user-defined type
+    nest.ResetKernel()
+    stim = nest.Create(stim_model)
+    n = nest.Create("iaf_psc_alpha")
+    synmodel = f"{stim_model}_syn"
+    nest.CopyModel("static_synapse", synmodel)
+    nest.Connect(stim, n, "all_to_all", syn_spec=synmodel)
+    nest.Connect(stim, n, "all_to_all", syn_spec=synmodel)
+
+    # Third test: no multiple connections with different types
+    nest.ResetKernel()
+    stim = nest.Create(stim_model)
+    n = nest.Create("iaf_psc_alpha")
+    synmodel = f"{stim_model}_syn"
+    nest.CopyModel("static_synapse", synmodel)
+    nest.Connect(stim, n, "all_to_all", syn_spec="static_synapse")
+    with pytest.raises(nest.NESTError):
+        nest.Connect(stim, n, "all_to_all", syn_spec=synmodel)