#[test]
    /// Test if wireguard leaks resources on closing
    fn test_fd_leaks() {
        let n_before = count_file_descriptors_currently_in_use();
        let wg = WGHandle::init("192.0.2.0".parse().unwrap(), "::2".parse().unwrap());
        let response = wg.wg_get();
        assert!(response.ends_with("errno=0\n\n"));
        drop(wg);  // call destructor
        let n_before = count_file_descriptors_currently_in_use();
        assert_eq!(n_before, n_after);
    }

pub fn count_file_descriptors_currently_in_use() -> u16 {
    use std::process;
    use std::process::Command;
    let path = format!("/proc/{}/fd/", process::id());
    let output = Command::new("ls")
        .args(&["-l", &path])
        .output()
        .expect("failed to get fd info");
    let stdout = String::from_utf8_lossy(&output.stdout);
    let mut n: u16 = 0;
    for x in stdout.lines() {
        n += 1;
    }
    n
}