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: local.rs
    path of file: ./repos/rumqtt/rumqttd/src/link
    
    the code of the file until where you have to start completion: use crate::protocol::{
    Filter, LastWill, LastWillProperties, Packet, Publish, QoS, RetainForwardRule, Subscribe,
};
use crate::router::Ack;
use crate::router::{
    iobufs::{Incoming, Outgoing},
    Connection, Event, Notification, ShadowRequest,
};
use crate::Connection
    
    fn push_sends_all_data_and_notifications_to_router() {
        let (router_tx, router_rx) = bounded(10);
        let mut buffers = Vec::new();
        const CONNECTIONS: usize = 1000;
        const MESSAGES_PER_CONNECTION: usize = 100;

        for i in 0..CONNECTIONS {
            let buffer = Arc::new(Mutex::new(VecDeque::new()));
            let mut link_tx = LinkTx::new(i, router_tx.clone(), buffer.clone());
            buffers.push(buffer);
            thread::spawn(move || {
                for _ in 0..MESSAGES_PER_CONNECTION {
                    link_tx.publish("hello/world", vec![1, 2, 3]).unwrap();
                }
            });
        }

        // Router should receive notifications from all the connections
        for _ in 0..CONNECTIONS * MESSAGES_PER_CONNECTION {
            let _v = router_rx.recv().unwrap();
        }

        // Every connection has expected number of messages
        for item in buffers.iter().take(CONNECTIONS) {
            assert_eq!(item.lock().len(), MESSAGES_PER_CONNECTION);
        }

        // TODO: Write a similar test to benchmark buffer vs channels
    }