def test_tell_sends_message_and_sender_to_cell():
cell = Mock(spec_set=Cell)
sender = Mock(spec_set=ActorRef)
message = object()
ref = ActorRef(cell)
ref.tell(message, sender)
cell.send_message.assert_called_once_with(message, sender)
def test_tell_raises_if_sender_is_not_an_actor_ref():
ref = ActorRef(Mock())
with pytest.raises(ValueError):
ref.tell(Mock(), object())
