Merge pull request #3457 from jessica-mitchell/sli2py_327

Port regression test 327 to Pytests

Author: heplesser

testsuite/pytests/sli2py_regressions/test_issue_327.py

@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+#
+# test_issue_327.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/>.
+"""
+Regression test for Issue #327 (GitHub).
+
+This test ensures that NEST handles round-off correctly for large, precise spike times.
+"""
+
+import nest
+import pytest
+
+
+def test_spike_generator_large_precise_times():
+    """
+    Test that spike_generator handles large precise times correctly.
+    """
+    nest.ResetKernel()
+    nest.SetKernelStatus({"resolution": 0.1})
+
+    sg = nest.Create(
+        "spike_generator",
+        params={
+            "precise_times": True,
+            "spike_times": [353538.4 - 0.1],  # Adjust for use of parrot_neuron by subtracting min_delay
+        },
+    )
+
+    pn = nest.Create("parrot_neuron_ps")
+    sr = nest.Create("spike_recorder", params={"time_in_steps": True})
+
+    nest.Connect(sg, pn)
+    nest.Connect(pn, sr)
+
+    nest.Simulate(360000)
+
+    events = nest.GetStatus(sr, "events")[0]
+    times = events["times"]
+    offsets = events["offsets"]
+
+    # Check correct step, account for delay 1 ms
+    assert times[0] == 3535393
+
+    # Check for correct offset, precision limited by spike time * eps
+    assert abs(offsets[0]) < 1e-9