#[path = "../../../os-vfs-unmount/src/lib.rs"]
mod unmount;

#[test]
fn os_vfs_unmount_positive() {
    let mut mount = unmount::Mount::new(2, 7).unwrap();
    let old = mount.token();
    let open = mount.acquire(unmount::Kind::Open).unwrap();
    let lookup = mount.acquire(unmount::Kind::Lookup).unwrap();
    let pin = mount.acquire(unmount::Kind::CachePin).unwrap();
    assert_eq!(mount.counts(), unmount::Counts {
        open: 1, lookup: 1, cache_pins: 1 });
    assert_eq!(mount.unmount(), Err(unmount::Error::Busy));
    assert_eq!(mount.release(open), Ok(()));
    assert_eq!(mount.release(lookup), Ok(()));
    assert_eq!(mount.unmount(), Err(unmount::Error::Busy));
    assert_eq!(mount.release(pin), Ok(()));
    assert_eq!(mount.unmount(), Ok(8));
    assert!(!mount.mounted());
    assert_eq!(mount.validate(old), Err(unmount::Error::Stale));
    let fresh = mount.remount().unwrap();
    assert_eq!((fresh.volume(), fresh.generation()), (2, 8));
    assert_eq!(mount.validate(fresh), Ok(()));
    assert_eq!(mount.validate(old), Err(unmount::Error::Stale));
}

#[test]
fn os_vfs_unmount_negative() {
    assert_eq!(unmount::Mount::new(0, 1), Err(unmount::Error::InvalidMount));
    let mut mount = unmount::Mount::new(1, 1).unwrap();
    let pin = mount.acquire(unmount::Kind::CachePin).unwrap();
    let before = mount;
    assert_eq!(mount.unmount(), Err(unmount::Error::Busy));
    assert_eq!(mount, before);
    assert_eq!(mount.release(pin), Ok(()));
    let after_release = mount;
    assert_eq!(mount.release(pin), Err(unmount::Error::Stale));
    assert_eq!(mount, after_release);
    let one = mount.acquire(unmount::Kind::Open).unwrap();
    let two = mount.acquire(unmount::Kind::Open).unwrap();
    let three = mount.acquire(unmount::Kind::Lookup).unwrap();
    let full = mount;
    assert_eq!(mount.acquire(unmount::Kind::CachePin), Err(unmount::Error::NoSpace));
    assert_eq!(mount, full);
    assert_eq!(mount.release(one), Ok(()));
    assert_eq!(mount.release(two), Ok(()));
    assert_eq!(mount.release(three), Ok(()));
    let mut terminal = unmount::Mount::new(1, u64::MAX).unwrap();
    let before_overflow = terminal;
    assert_eq!(terminal.unmount(), Err(unmount::Error::Overflow));
    assert_eq!(terminal, before_overflow);
}