def test_goodbye_all_services():
"""Verify generating the goodbye query does not change with time."""
zc = Zeroconf(interfaces=['127.0.0.1'])
out = zc.generate_unregister_all_services()
assert out is None
type_ = "_http._tcp.local."
registration_name = "xxxyyy.%s" % type_
desc = {'path': '/~paulsm/'}
info = r.ServiceInfo(type_,
registration_name,
80,
0,
0,
desc,
"ash-2.local.",
addresses=[socket.inet_aton("10.0.1.2")])
zc.registry.add(info)
out = zc.generate_unregister_all_services()
assert out is not None
first_packet = out.packets()
zc.registry.add(info)
out2 = zc.generate_unregister_all_services()
assert out2 is not None
second_packet = out.packets()
assert second_packet == first_packet
# Verify the registery is empty
out3 = zc.generate_unregister_all_services()
assert out3 is None
assert zc.registry.get_service_infos() == []
zc.close()
