def METHOD_NAME(self):
    atype1 = AtomType(atomclass="CT", name="t1")
    atype2 = AtomType(atomclass="CK", name="t2")
    bond = Bond(
        connection_members=[Atom(atom_type=atype1), Atom(atom_type=atype2)]
    )
    assert set(bond.member_classes) == set(["CT", "CK"])
    assert set(bond.member_types) == set(["t1", "t2"])