def METHOD_NAME(self, reqd_attributes, outfile):
    attrs = reqd_attributes
    attrs.remove('radii')
    u = make_Universe(attrs, trajectory=True)
    with pytest.warns(UserWarning):
        u.atoms.write(outfile)
    u2 = mda.Universe(outfile)
    assert all(u2.atoms.radii == 1.0)