Function run_tunnel_with_client 

pub async fn run_tunnel_with_client(
    vps_name: &str,
    local_port: u16,
    remote_host: &str,
    remote_port: u16,
    timeout_ms: u64,
    json: bool,
    client: Box<dyn SshClientTrait>,
    bound_flag: Option<Arc<AtomicBool>>,
    bind_addr: &str,
) -> Result<()>

Testable tunnel loop.