Added test for .alt
Added test for .alt

As before - looking for issues in my current issue, decided to
make sure alt did what I thought it did.

It does.

This test is a bit more verbose.  Feel free to disregard it

anko/partser,edge/parsimmon,jneen/parsimmon,edge/parsimmon,claudiopro/parsimmon,claudiopro/parsimmon