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: req_router_dealer_rep.rs
    path of file: ./repos/zmq.rs/tests
    
    the code of the file until where you have to start completion: mod helpers;

use zeromq::__async_rt as async_rt;
use zeromq::prelude::*;

use futures_util::StreamExt;
use std::error::Error;
use std::time::Duration;

#[async_rt::test]
async fn test_req_router_dealer_rep_sockets() -> Result<(), Box<dyn Error>> {
    pretty_env_logger::try_init().ok();

    let mut router_socket = zeromq::RouterSocket::new();
    let router_monitor = router_socket.monitor();
    let router_endpoint = router_socket.bind("tcp://localhost:0").await?;

    let mut dealer_socket = zeromq::DealerSocket::new();
    let dealer_monitor = dealer_socket.monitor();
    let dealer_endpoint = dealer_socket.bind("tcp://localhost:0").await?;

    let mut rep_socket = zeromq::RepSocket::new();
    let rep_monitor = rep_socket.monitor();
    rep_socket
        .connect(dealer_endpoint.to_string().as_str())
        .await?;

    let num_messages = 10;

    async_rt::task::spawn(async move {
        helpers::run_rep_server(rep_socket, num_messages)
            .await
            .unwrap();
    });

    let req_task = async_rt::task::spawn(async move {
        let mut req_socket = zeromq::ReqSocket::new();
        req_socket
            .connect(router_endpoint.to_string().as_str())
            .await
            .unwrap();
        helpers::run_req_client(req_socket, num_messages)
            .await
            .unwrap();
    });

    helpers::run_proxy(router_socket, dealer_socket, 100).await;

    req_task.await.unwrap();

    let router_events: Vec<_> = router_monitor.collect().await;
    let dealer_events: Vec<_> = dealer_monitor.collect().await;
    let rep_events: Vec<_> = rep_
    
async fn test_many_req_router_dealer_rep_sockets() -> Result<(), Box<dyn Error>> {
    pretty_env_logger::try_init().ok();

    let mut router_socket = zeromq::RouterSocket::new();
    let router_endpoint = router_socket.bind("tcp://localhost:0").await?;

    let mut dealer_socket = zeromq::DealerSocket::new();
    let dealer_endpoint = dealer_socket.bind("tcp://localhost:0").await?;

    let num_req_sockets = 100;
    let num_messages = 100;

    async_rt::task::spawn(async move {
        let mut rep_socket = zeromq::RepSocket::new();
        rep_socket
            .connect(dealer_endpoint.to_string().as_str())
            .await
            .unwrap();
        helpers::run_rep_server(rep_socket, num_req_sockets * num_messages)
            .await
            .unwrap();
    });

    let mut req_tasks = Vec::with_capacity(num_req_sockets as usize);
    for i in 0..num_req_sockets {
        let router_endpoint_clone = router_endpoint.to_string();
        let req_task = async_rt::task::spawn(async move {
            // yield for a moment to ensure that server has some time to open socket
            async_rt::task::sleep(Duration::from_millis(100)).await;
            let mut req_socket = zeromq::ReqSocket::new();
            req_socket.connect(&router_endpoint_clone).await.unwrap();
            helpers::run_req_client_with_id(req_socket, i, num_messages)
                .await
                .unwrap();
        });
        req_tasks.push(req_task);
    }

    helpers::run_proxy(router_socket, dealer_socket, 5000).await;

    for req_task in req_tasks {
        req_task.await.unwrap();
    }

    Ok(())
}