You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_address.rs
    path of file: ./repos/actix/actix/tests
    
    the code of the file until where you have to start completion: use std::{
    collections::HashSet,
    sync::{
        atomic::{AtomicUsize, Ordering},
        Arc,
    },
    time::Duration,
};

use actix::{prelude::*, WeakRecipient};
use actix_rt::time::sleep;

#[derive(Debug)]
struct Ping;

impl Message for Ping {
    type Result = ();
}

struct MyActor(Arc<AtomicUsize>);

impl Actor for MyActor {
    type Context = actix::Context<Self>;
}

impl actix::Handler<Ping> for MyActor {
    type Result = ();

    fn handle(&mut self, _: 
    
fn test_weak_recipient_can_be_cloned() {
    let sys = System::new();

    sys.block_on(async move {
        let addr = PingCounterActor::start_default();
        let weak_recipient = addr.downgrade().recipient();
        let weak_recipient_clone = weak_recipient.clone();

        weak_recipient
            .upgrade()
            .expect("must be able to upgrade the weak recipient here")
            .send(Ping)
            .await
            .expect("send must not fail");
        weak_recipient_clone
            .upgrade()
            .expect("must be able to upgrade the cloned weak recipient here")
            .send(Ping)
            .await
            .expect("send must not fail");
        let pings = addr.send(CountPings {}).await.expect("send must not fail");
        assert_eq!(
            pings, 2,
            "both the weak recipient and its clone must have sent a ping"
        );
    });
}