#![cfg(feature = "linux-runtime")]

use futures_util::TryStreamExt;
use rtnetlink::packet_route::link::LinkAttribute;

// Run on the disposable ALT VM, including with no active roentgen0. A dump
// omits missing interfaces, whereas the production named lookup returns ENODEV.
#[tokio::test]
async fn tun_lookup_agrees_with_kernel_link_dump() -> anyhow::Result<()> {
    let (connection, handle, _) = rtnetlink::new_connection()?;
    tokio::spawn(connection);
    let mut links = handle.link().get().execute();
    let mut expected = None;
    while let Some(link) = links.try_next().await? {
        if link.attributes.iter().any(|attribute| {
            matches!(attribute, LinkAttribute::IfName(name) if name == "roentgen0")
        }) {
            expected = Some(link.header.index);
        }
    }
    assert_eq!(roentgen::linux::routes::tun_index().await?, expected);
    Ok(())
}