#[test]
fn lock_file_created_and_prevents_second_acquisition() {
    let dir = tempfile::tempdir().unwrap();
    let lock_path = dir.path().join("ahfail.lock");

    let acquired = ahfail_ui::volume::try_acquire_lock(&lock_path);
    assert!(acquired);
    assert!(lock_path.exists());

    let acquired2 = ahfail_ui::volume::try_acquire_lock(&lock_path);
    assert!(!acquired2);
}