Add photon tests

tests/regression_tests/photon_source/inputs_true.dat

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+<?xml version='1.0' encoding='utf-8'?>
+<geometry>
+  <cell id="13" material="13" region="-9" universe="9" />
+  <surface boundary="reflective" coeffs="0.0 0.0 0.0 1000000000.0" id="9" type="sphere" />
+</geometry>
+<?xml version='1.0' encoding='utf-8'?>
+<materials>
+  <material id="13">
+    <density units="g/cm3" value="0.998207" />
+    <nuclide ao="0.11187657362844" name="H1" />
+    <nuclide ao="1.7426371559999997e-05" name="H2" />
+    <nuclide ao="0.8877694078259999" name="O16" />
+    <nuclide ao="0.000336592174" name="O17" />
+  </material>
+</materials>
+<?xml version='1.0' encoding='utf-8'?>
+<settings>
+  <run_mode>fixed source</run_mode>
+  <particles>10000</particles>
+  <batches>1</batches>
+  <source particle="photon" strength="1.0">
+    <space type="point">
+      <parameters>0 0 0</parameters>
+    </space>
+    <angle type="isotropic" />
+    <energy type="discrete">
+      <parameters>10000000.0 1.0</parameters>
+    </energy>
+  </source>
+  <electron_treatment>ttb</electron_treatment>
+  <photon_transport>true</photon_transport>
+  <cutoff>
+    <energy_photon>1000.0</energy_photon>
+  </cutoff>
+</settings>
+<?xml version='1.0' encoding='utf-8'?>
+<tallies>
+  <tally id="1">
+    <scores>flux</scores>
+  </tally>
+</tallies>

tests/regression_tests/photon_source/results_true.dat

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+tally 1:
+sum = 2.254985E+02
+sum_sq = 5.084955E+04

tests/regression_tests/photon_source/test.py

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+from math import pi
+
+import numpy as np
+import openmc
+
+from tests.testing_harness import PyAPITestHarness
+
+
+class SourceTestHarness(PyAPITestHarness):
+    def _build_inputs(self):
+        mat = openmc.Material()
+        mat.set_density('g/cm3', 0.998207)
+        mat.add_element('H', 0.111894)
+        mat.add_element('O', 0.888106)
+        materials = openmc.Materials([mat])
+        materials.export_to_xml()
+
+        sphere = openmc.Sphere(R=1.0e9, boundary_type='reflective')
+        inside_sphere = openmc.Cell()
+        inside_sphere.region = -sphere
+        inside_sphere.fill = mat
+        root = openmc.Universe()
+        root.add_cell(inside_sphere)
+        geometry = openmc.Geometry(root)
+        geometry.export_to_xml()
+ 
+        source = openmc.Source()
+        source.space = openmc.stats.Point((0, 0, 0))
+        source.angle = openmc.stats.Isotropic()
+        source.energy = openmc.stats.Discrete([10.0e6], [1.0])
+        source.particle = 'photon'
+ 
+        settings = openmc.Settings()
+        settings.particles = 10000
+        settings.batches = 1
+        settings.photon_transport = True
+        settings.electron_treatment = 'ttb'
+        settings.cutoff = {'energy_photon' : 1000.0}
+        settings.run_mode = 'fixed source'
+        settings.source = source
+        settings.export_to_xml()
+ 
+        tally = openmc.Tally()
+        tally.scores = ['flux']
+        tallies = openmc.Tallies([tally])
+        tallies.export_to_xml()
+
+    def _get_results(self):
+        sp = openmc.StatePoint(self._sp_name)
+        outstr = ''
+        t = sp.get_tally()
+        outstr += 'tally {}:\n'.format(t.id)
+        outstr += 'sum = {:12.6E}\n'.format(t.sum[0, 0, 0])
+        outstr += 'sum_sq = {:12.6E}\n'.format(t.sum_sq[0, 0, 0])
+
+        return outstr
+
+
+def test_source():
+    harness = SourceTestHarness('statepoint.1.h5')
+    harness.main()