Add filter_cellinstance test

tests/regression_tests/filter_cellinstance/inputs_true.dat

@@ -0,0 +1,64 @@
+<?xml version='1.0' encoding='utf-8'?>
+<geometry>
+  <cell id="1" material="1" region="-1" universe="1" />
+  <cell id="2" material="2" region="1" universe="1" />
+  <cell id="3" material="1" region="-2" universe="2" />
+  <cell id="4" material="2" region="2" universe="2" />
+  <cell fill="3" id="5" region="3 -4 5 -6" universe="4" />
+  <lattice id="3">
+    <pitch>2 2</pitch>
+    <dimension>4 4</dimension>
+    <lower_left>-4 -4</lower_left>
+    <universes>
+1 2 2 2 
+2 1 2 2 
+2 2 1 2 
+2 2 2 1 </universes>
+  </lattice>
+  <surface coeffs="0.0 0.0 0.7" id="1" type="z-cylinder" />
+  <surface coeffs="0.0 0.0 0.5" id="2" type="z-cylinder" />
+  <surface boundary="reflective" coeffs="-4.0" id="3" name="minimum x" type="x-plane" />
+  <surface boundary="reflective" coeffs="4.0" id="4" name="maximum x" type="x-plane" />
+  <surface boundary="reflective" coeffs="-4.0" id="5" name="minimum y" type="y-plane" />
+  <surface boundary="reflective" coeffs="4.0" id="6" name="maximum y" type="y-plane" />
+</geometry>
+<?xml version='1.0' encoding='utf-8'?>
+<materials>
+  <material depletable="true" id="1">
+    <density units="g/cc" value="4.5" />
+    <nuclide ao="1.0" name="U235" />
+  </material>
+  <material id="2">
+    <density units="g/cc" value="1.0" />
+    <nuclide ao="1.0" name="H1" />
+  </material>
+</materials>
+<?xml version='1.0' encoding='utf-8'?>
+<settings>
+  <run_mode>eigenvalue</run_mode>
+  <particles>1000</particles>
+  <batches>5</batches>
+  <inactive>0</inactive>
+  <source strength="1.0">
+    <space type="point">
+      <parameters>0.0 0.0 0.0</parameters>
+    </space>
+  </source>
+</settings>
+<?xml version='1.0' encoding='utf-8'?>
+<tallies>
+  <filter id="1" type="cellinstance">
+    <bins>3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 3 10 3 11 2 0 2 1 2 2 2 3</bins>
+  </filter>
+  <filter id="2" type="cellinstance">
+    <bins>2 3 2 2 2 1 2 0 3 11 3 10 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0</bins>
+  </filter>
+  <tally id="1">
+    <filters>1</filters>
+    <scores>total</scores>
+  </tally>
+  <tally id="2">
+    <filters>2</filters>
+    <scores>total</scores>
+  </tally>
+</tallies>

tests/regression_tests/filter_cellinstance/results_true.dat

@@ -0,0 +1,68 @@
+k-combined:
+1.060380E+00 4.511966E-03
+tally 1:
+8.636855E-02
+1.795640E-03
+1.478489E-01
+5.007770E-03
+1.687036E-01
+6.223488E-03
+1.035433E-01
+2.767195E-03
+2.789537E-01
+1.720816E-02
+1.420504E-01
+4.539772E-03
+1.325589E-01
+3.998010E-03
+2.934613E-01
+2.064779E-02
+1.231465E-01
+3.847169E-03
+1.282909E-01
+3.680695E-03
+1.545480E-01
+5.588411E-03
+5.110026E-02
+5.947113E-04
+1.119824E+01
+3.030467E+01
+2.847726E+01
+1.920547E+02
+2.819853E+01
+1.906807E+02
+8.816481E+00
+2.016785E+01
+tally 2:
+8.816481E+00
+2.016785E+01
+2.819853E+01
+1.906807E+02
+2.847726E+01
+1.920547E+02
+1.119824E+01
+3.030467E+01
+5.110026E-02
+5.947113E-04
+1.545480E-01
+5.588411E-03
+1.282909E-01
+3.680695E-03
+1.231465E-01
+3.847169E-03
+2.934613E-01
+2.064779E-02
+1.325589E-01
+3.998010E-03
+1.420504E-01
+4.539772E-03
+2.789537E-01
+1.720816E-02
+1.035433E-01
+2.767195E-03
+1.687036E-01
+6.223488E-03
+1.478489E-01
+5.007770E-03
+8.636855E-02
+1.795640E-03

tests/regression_tests/filter_cellinstance/test.py

@@ -0,0 +1,69 @@
+import openmc
+import openmc.model
+import pytest
+
+from tests.testing_harness import PyAPITestHarness
+
+
+@pytest.fixture
+def model():
+    model = openmc.model.Model()
+
+    # Materials
+    m1 = openmc.Material()
+    m1.set_density('g/cc', 4.5)
+    m1.add_nuclide('U235', 1.0)
+    m2 = openmc.Material()
+    m2.set_density('g/cc', 1.0)
+    m2.add_nuclide('H1', 1.0)
+    model.materials += [m1, m2]
+
+    # Geometry
+    cyl1 = openmc.ZCylinder(r=0.7)
+    c1 = openmc.Cell(fill=m1, region=-cyl1)
+    c2 = openmc.Cell(fill=m2, region=+cyl1)
+    u1 = openmc.Universe(cells=[c1, c2])
+
+    cyl2 = openmc.ZCylinder(r=0.5)
+    c3 = openmc.Cell(fill=m1, region=-cyl2)
+    c4 = openmc.Cell(fill=m2, region=+cyl2)
+    u2 = openmc.Universe(cells=[c3, c4])
+
+    lat = openmc.RectLattice()
+    lat.lower_left = (-4, -4)
+    lat.pitch = (2, 2)
+    lat.universes = [
+        [u1, u2, u2, u2],
+        [u2, u1, u2, u2],
+        [u2, u2, u1, u2],
+        [u2, u2, u2, u1]
+    ]
+    box = openmc.model.rectangular_prism(8.0, 8.0, boundary_type='reflective')
+    main_cell = openmc.Cell(fill=lat, region=box)
+    model.geometry.root_universe = openmc.Universe(cells=[main_cell])
+    model.geometry.determine_paths()
+
+    # Settings
+    model.settings.batches = 5
+    model.settings.inactive = 0
+    model.settings.particles = 1000
+    model.settings.source = openmc.Source(space=openmc.stats.Point())
+
+    instances = ([(c3, i) for i in range(c3.num_instances)] +
+                 [(c2, i) for i in range(c2.num_instances)])
+    f1 = openmc.CellInstanceFilter(instances)
+    f2 = openmc.CellInstanceFilter(instances[::-1])
+    t1 = openmc.Tally()
+    t1.filters = [f1]
+    t1.scores = ['total']
+    t2 = openmc.Tally()
+    t2.filters = [f2]
+    t2.scores = ['total']
+    model.tallies += [t1, t2]
+
+    return model
+
+
+def test_cell_instance(model):
+    harness = PyAPITestHarness('statepoint.5.h5', model)
+    harness.main()