test: reuse canonical unstructured mesh assets

tests/unit_tests/test_mesh.py

@@ -14,6 +14,8 @@
 from uncertainties.unumpy import uarray, nominal_values, std_devs
 
 
+UMESH_DIR = Path(__file__).resolve().parents[1] / 'regression_tests' / 'unstructured_mesh'
+
 @pytest.mark.parametrize("val_left,val_right", [(0, 0), (-1., -1.), (2.0, 2)])
 def test_raises_error_when_flat(val_left, val_right):
     """Checks that an error is raised when a mesh is flat"""
@@ -388,7 +390,7 @@ def test_mesh_name_roundtrip(run_in_tmpdir):
 
 
 def test_umesh_roundtrip(run_in_tmpdir, request):
-    umesh = openmc.UnstructuredMesh(request.path.parent / 'test_mesh_tets.e', 'moab')
+    umesh = openmc.UnstructuredMesh(UMESH_DIR / 'test_mesh_tets.exo', 'moab')
     umesh.interface = 'xdg'
     umesh.output = True
 
@@ -562,11 +564,11 @@ def test_umesh(run_in_tmpdir, simple_umesh, export_type):
 
 vtkhdf_tests = [
     (
-        Path("test_mesh_dagmc_tets.vtk"),
+        UMESH_DIR / "test_mesh_dagmc_tets.vtk",
         "moab"
     ),
     (
-        Path("test_mesh_hexes.exo"),
+        UMESH_DIR / "test_mesh_hexes.exo",
         "libmesh"
     )
 ]

tests/unit_tests/test_source_mesh.py

@@ -15,6 +15,8 @@
 # MeshSpatial Tests
 ###################
 TETS_PER_VOXEL = 12
+UMESH_TETS = (Path(__file__).resolve().parents[1] / 'regression_tests' /
+              'unstructured_mesh' / 'test_mesh_tets.exo')
 
 # This test uses a geometry file with cells that match a regular mesh. Each cell
 # in the geometry corresponds to 12 tetrahedra in the unstructured mesh file.
@@ -83,7 +85,7 @@ def test_unstructured_mesh_sampling(model, request, test_cases):
         pytest.skip("XDG mesh interface not enabled in this build.")
 
     # setup mesh source ###
-    mesh_filename = Path(request.fspath).parent / "test_mesh_tets.e"
+    mesh_filename = UMESH_TETS
     uscd_mesh = openmc.UnstructuredMesh(mesh_filename, test_cases['library'])
     uscd_mesh.interface = test_cases['interface']
 
@@ -153,7 +155,7 @@ def test_unstructured_mesh_sampling(model, request, test_cases):
 
 def test_strengths_size_failure(request, model):
     # setup mesh source ###
-    mesh_filename = Path(request.fspath).parent / "test_mesh_tets.e"
+    mesh_filename = UMESH_TETS
     uscd_mesh = openmc.UnstructuredMesh(mesh_filename, 'libmesh')
 
     # intentionally incorrectly sized to trigger an error
@@ -191,7 +193,7 @@ def test_roundtrip(run_in_tmpdir, model, request):
     ):
         pytest.skip("Unstructured mesh is not enabled in this build.")
 
-    mesh_filename = Path(request.fspath).parent / 'test_mesh_tets.e'
+    mesh_filename = UMESH_TETS
     ucd_mesh = openmc.UnstructuredMesh(mesh_filename, library='libmesh')
 
     if not openmc.lib.feature_enabled('libmesh'):
@@ -339,7 +341,7 @@ def test_umesh_source_independent(run_in_tmpdir, request, void_model, library, i
 
     model = void_model
 
-    mesh_filename = Path(request.fspath).parent / "test_mesh_tets.e"
+    mesh_filename = UMESH_TETS
     uscd_mesh = openmc.UnstructuredMesh(mesh_filename, library)
     uscd_mesh.interface = interface
     ind_source = openmc.IndependentSource()

tests/unit_tests/weightwindows/test.py

@@ -14,6 +14,9 @@
 from tests import cdtemp
 
 
+UMESH_TETS = (Path(__file__).resolve().parents[2] / 'regression_tests' /
+              'unstructured_mesh' / 'test_mesh_tets.exo')
+
 @pytest.fixture
 def wws():
 
@@ -372,7 +375,7 @@ def test_unstructured_mesh_applied_wws(request, run_in_tmpdir, library, interfac
     cell = openmc.Cell(region=-box, fill=water)
 
     geometry = openmc.Geometry([cell])
-    mesh_file = str(request.fspath.dirpath() / 'test_mesh_tets.exo')
+    mesh_file = str(UMESH_TETS)
     mesh = openmc.UnstructuredMesh(mesh_file, library)
     mesh.interface = interface
 

tests/unit_tests/weightwindows/test_ww_list.py

@@ -1,3 +1,5 @@
+from pathlib import Path
+
 import h5py
 import numpy as np
 import pytest
@@ -6,6 +8,9 @@
 import openmc.lib
 
 
+UMESH_TETS = (Path(__file__).resolve().parents[2] / 'regression_tests' /
+              'unstructured_mesh' / 'test_mesh_tets.exo')
+
 def test_ww_roundtrip(request, run_in_tmpdir, monkeypatch):
     # Load weight windows from a wwinp file
     wwinp_file = request.path.with_name('wwinp_n')
@@ -87,7 +92,7 @@ def test_export_hdf5_unstructured_mesh(request, run_in_tmpdir, library):
         pytest.skip('DAGMC (and MOAB) not enabled in this build.')
 
     mesh = openmc.UnstructuredMesh(
-        request.path.with_name('test_mesh_tets.exo'), library, mesh_id=20,
+        UMESH_TETS, library, mesh_id=20,
         name='unstructured', length_multiplier=2.0)
     ww = openmc.WeightWindows(mesh, np.ones(12_000), upper_bound_ratio=5.0)
     openmc.WeightWindowsList([ww]).export_to_hdf5('ww.h5')