def METHOD_NAME(self, tmpdir):
    # Issue #3057
    u = Universe(mol2_sodium_ion)
    ag = u.atoms
    assert not hasattr(ag, "bonds")
    with tmpdir.as_cwd():
        outfile = 'test.mol2'
        ag.write(outfile)
        u2 = Universe(outfile)
    assert not hasattr(u2.atoms, "bonds")