Port mpitests/test_multiplicity from SLI to Py

testsuite/pytests/mpi/2/test_multiplicity.py

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+../../test_multiplicity.py

testsuite/pytests/test_multiplicity.py

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+# -*- coding: utf-8 -*-
+#
+# test_multiplicity.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 numpy as np
+import pytest
+
+
+@pytest.mark.skipif_missing_threads
+def test_multiplicity():
+    """
+    Confirm that spike multiplicity is handled correctly.
+
+    Creates two parrot neurons and connects the first one to the second one. The
+    first parrot neuron receives one spike with multiplicity two from a spike
+    generator, which should be communicated as two spikes to the second parrot
+    neuron. Each parrot neuron is connected to a spike recorder, which should
+    record two spikes.
+    """
+
+    import nest
+
+    nest.total_num_virtual_procs = 2
+
+    sg = nest.Create("spike_generator", params={"spike_times": [1.0], "spike_multiplicities": [2]})
+    p_source, p_target = nest.Create("parrot_neuron", 2)
+    sr_source, sr_target = nest.Create("spike_recorder", 2)
+
+    nest.Connect(sg, p_source)
+    nest.Connect(p_source, p_target)
+    nest.Connect(p_source, sr_source)
+    nest.Connect(p_target, sr_target)
+
+    nest.Simulate(10)
+
+    # When running this on two MPI ranks, we need to make sure we check for spike times
+    # only on the rank responsible for the neuron recorded by the recorder.
+    assert not p_source.local or np.array_equal(sr_source.events["times"], [2, 2])
+    assert not p_target.local or np.array_equal(sr_target.events["times"], [3, 3])