def METHOD_NAME(self, u, outfile):
    # Write out a copy of the Universe, and compare this against the original
    # This is more rigorous than simply checking the coordinates as it checks
    # all formatting
    u.atoms.write(outfile)
    def CRD_iter(fn):
        with open(fn, 'r') as inf:
            for line in inf:
                if not line.startswith('*'):
                    yield line
    for ref, other in zip(CRD_iter(CRD), CRD_iter(outfile)):
        assert ref == other