Establish a test suite

[paulromano]

Right now, the capabilities in this repository have no associated test suite. To ensure software quality, a test suite should be put together covering the functionality.

[pshriwise]

We'll need to determine what metrics are used to validate the converted models. Some initial thoughts:

• Volume calculations (maybe targeted on a cell-by-cell basis)
• Reference calcs (eigenvalue, flux spectra)

[MicahGale]

Might I suggest MontePy as a code-to-code comparison for the test suite. ;)

@pshriwise I feel like these sort of tests draws way too large of a box around the test's scope. IMO the requirement for this tool is that:

The MCNP and OpenMC models are semantically equivalent.

I think for an integration test I would do:

1. Run test models through tool
2. Open original and new model in montepy and openmc (python) respectively.
3. Run through and assert various attributes in both models are equivalent. The geometry equivalence will be the hardest as I don't know how to assert binary trees are equivalent when they are not identical.