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: gossip_service.rs
    path of file: ./repos/solana/gossip/src
    
    the code of the file until where you have to start completion: //! The `gossip_service` module implements the network control plane.

use {
    crate::{cluster_info::ClusterInfo, legacy_contact_info::LegacyContactInfo as ContactInfo},
    crossbeam_channel::{unbounded, Sender},
    rand::{thread_rng, Rng},
    solana_client::{connection_cache::ConnectionCache, thin_client::ThinClient},
    solana_perf::recycler::Re
    
    fn test_exit() {
        let exit = Arc::new(AtomicBool::new(false));
        let tn = Node::new_localhost();
        let cluster_info = ClusterInfo::new(
            tn.info.clone(),
            Arc::new(Keypair::new()),
            SocketAddrSpace::Unspecified,
        );
        let c = Arc::new(cluster_info);
        let d = GossipService::new(
            &c,
            None,
            tn.sockets.gossip,
            None,
            true, // should_check_duplicate_instance
            None,
            exit.clone(),
        );
        exit.store(true, Ordering::Relaxed);
        d.join().unwrap();
    }