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: no_filter.rs
    path of file: ./repos/quilkin/tests
    
    the code of the file until where you have to start completion: /*
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the Licens
    
async fn echo() {
    let mut t = TestHelper::default();

    // create two echo servers as endpoints
    let server1 = t.run_echo_server(&AddressType::Random).await;
    let server2 = t.run_echo_server(&AddressType::Random).await;

    // create server configuration
    let local_addr = available_addr(&AddressType::Random).await;
    let server_proxy = quilkin::cli::Proxy {
        port: local_addr.port(),
        qcmp_port: 0,
        ..<_>::default()
    };
    let server_config = std::sync::Arc::new(quilkin::Config::default());
    server_config.clusters.modify(|clusters| {
        clusters.insert_default(
            [
                Endpoint::new(server1.clone()),
                Endpoint::new(server2.clone()),
            ]
            .into(),
        )
    });

    t.run_server(server_config, Some(server_proxy), None).await;

    // let's send the packet
    let (mut recv_chan, socket) = t.open_socket_and_recv_multiple_packets().await;

    socket.send_to(b"hello", &local_addr).await.unwrap();
    let value = timeout(Duration::from_millis(500), recv_chan.recv())
        .await
        .unwrap()
        .unwrap();
    assert_eq!("hello", value);
    let value = timeout(Duration::from_millis(500), recv_chan.recv())
        .await
        .unwrap()
        .unwrap();
    assert_eq!("hello", value);

    // should only be two returned items
    assert!(timeout(Duration::from_millis(500), recv_chan.recv())
        .await
        .is_err());
}