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: close.rs
    path of file: ./repos/neqo/neqo-transport/src/connection/tests
    
    the code of the file until where you have to start completion: // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT
    
fn closing_timers_interation() {
    let mut client = default_client();
    let mut server = default_server();
    connect(&mut client, &mut server);

    let mut now = now();

    // We're going to induce time-based loss recovery so that timer is set.
    let _p1 = send_something(&mut client, now);
    let p2 = send_something(&mut client, now);
    let ack = server.process(Some(&p2), now).dgram();
    assert!(ack.is_some()); // This is an ACK.

    // After processing the ACK, we should be on the loss recovery timer.
    let cb = client.process(ack.as_ref(), now).callback();
    assert_ne!(cb, Duration::from_secs(0));
    now += cb;

    // Rather than let the timer pop, close the connection.
    client.close(now, 0, "");
    let client_close = client.process(None, now).dgram();
    assert!(client_close.is_some());
    // This should now report the end of the closing period, not a
    // zero-duration wait driven by the (now defunct) loss recovery timer.
    let client_close_timer = client.process(None, now).callback();
    assert_ne!(client_close_timer, Duration::from_secs(0));
}