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: joined.rs
    path of file: ./repos/salvo/crates/core/src/conn
    
    the code of the file until where you have to start completion: //! JoinListener and it's implements.
use std::io::Result as IoResult;
use std::pin::Pin;
use std::sync::Arc;
use std::task::{Context, Poll};

use pin_project::pin_project;
use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
use tokio_util::sync::CancellationToken;

use crate::conn::{Holding, HttpBuilder};
use crate::fuse::{ArcFuseFactory, ArcFusewire, SteadyFusewire};
use crate::http::HttpConnection;
use crate::service::HyperHandle
    
    async fn test_joined_listener() {
        let addr1 = std::net::SocketAddr::from(([127, 0, 0, 1], 6978));
        let addr2 = std::net::SocketAddr::from(([127, 0, 0, 1], 6979));

        let mut acceptor = TcpListener::new(addr1).join(TcpListener::new(addr2)).bind().await;
        tokio::spawn(async move {
            let mut stream = TcpStream::connect(addr1).await.unwrap();
            stream.write_i32(50).await.unwrap();

            let mut stream = TcpStream::connect(addr2).await.unwrap();
            stream.write_i32(100).await.unwrap();
        });
        let Accepted { mut conn, .. } = acceptor.accept(Arc::new(SteadyFusewire)).await.unwrap();
        let first = conn.read_i32().await.unwrap();
        let Accepted { mut conn, .. } = acceptor.accept(Arc::new(SteadyFusewire)).await.unwrap();
        let second = conn.read_i32().await.unwrap();
        assert_eq!(first + second, 150);
    }