running plot test in tmp dir

openmc/plots.py

@@ -228,7 +228,6 @@ def _voxel_to_vtk(voxel_file: str, output: str = 'plot.vti'):
 
     # transpose data from OpenMC ordering (zyx) to VTK ordering (xyz)
     # and flatten to 1-D array
-    print("Reading and translating data...")
     h5data = fh["data"][...]
 
     data = vtk.vtkIntArray()

tests/unit_tests/test_plots.py

@@ -69,7 +69,7 @@ def myprojectionplot():
     return plot
 
 
-def test_voxel_plot():
+def test_voxel_plot(run_in_tmpdir):
     surf1 = openmc.Sphere(r=500, boundary_type='vacuum')
     cell1 = openmc.Cell(region=-surf1)
     geometry = openmc.Geometry([cell1])