In the case where the workflow is being done with native MCNP geometry and an unstructured mesh tally, r2s_step1.py does not tag the mesh with materials, and subsequently throws an error.
When refactoring r2s_step1, the unofficial test cases used (1) unstructured mesh with dagmc model tagged in cubit; and (2) structured mesh with materials via mmgrid.py; Thus the above case was missed.
In the case where the workflow is being done with native MCNP geometry and an unstructured mesh tally, r2s_step1.py does not tag the mesh with materials, and subsequently throws an error.
When refactoring r2s_step1, the unofficial test cases used (1) unstructured mesh with dagmc model tagged in cubit; and (2) structured mesh with materials via mmgrid.py; Thus the above case was missed.
This should be tested for, as well.