>
> <snip>
> +        if should_receive:
> +            self.verify(len(received_packets) == 1, "Expected packet not
> received")
> +        else:
> +            self.verify(len(received_packets) == 0, "Expected packet
> received")
>

Side note, didn't notice until I tested it but "Expected packet received"
doesn't really make sense as an error message