Add test for comments

Author: paulromano

tests/test_syntax.py

@@ -1,5 +1,6 @@
 from textwrap import dedent
 
+from pytest import approx
 from openmc_mcnp_adapter import mcnp_str_to_model
 
 
@@ -23,3 +24,28 @@ def test_repeat_shortcut():
     # Make sure E, F, G, H, J, and K parameters are 0.0
     for attr in 'efghj':
         assert getattr(surf, attr) == 0.0
+
+
+def test_comments():
+    mcnp_str = dedent("""
+    title
+    c This is a comment line
+    1   1 -5.0 -1  $ This is an end-of-line comment
+
+    c surface block
+    1   so  3.0  $ Another comment
+
+    m1   1001.80c  3.0  $ Material comment
+    """)
+    model = mcnp_str_to_model(mcnp_str)
+    surf = model.geometry.get_all_surfaces()[1]
+    cell = model.geometry.get_all_cells()[1]
+    mat = model.materials[0]
+
+    # Sanity checks
+    assert surf.r == 3.0
+    assert surf.x0 == 0.0
+    assert cell.id == 1
+    assert str(cell.region) == "-1"
+    assert 'H1' in mat.get_nuclide_densities()
+    assert mat.get_mass_density() == approx(5.0)