use bndpresbufch::{Builder, Error};

#[test]
fn perfect_force_fit() {
  // Create a queue that can hold at most 4 bytes of data
  let (pusher, puller) = Builder::new().max_size(4).build();

  // Fill queue up with 4 1-byte nodes
  for idx in 0..4 {
    pusher.try_push([idx].into()).unwrap();
  }

  // Force push a single buffer that is 4 bytes in size, which should eject all
  // the single-byte nodes.
  pusher.force_push([4, 5, 6, 7].into()).unwrap();

  let Some(buf) = puller.pop() else {
    panic!("Unexpectedly unable to get a buffer from queue");
  };
  assert_eq!(buf, &[4, 5, 6, 7]);

  let Ok(None) = puller.try_pop() else {
    panic!("Queue unexpectedly not empty");
  };
}

#[test]
fn force_too_big() {
  let (tx, rx) = Builder::new().max_size(2).build();
  assert_eq!(
    tx.force_push(vec![1, 2, 3]),
    Err(Error::WontFit(vec![1, 2, 3]))
  );
  assert_eq!(rx.try_pop(), Ok(None));
}

// vim: set ft=rust et sw=2 ts=2 sts=2 cinoptions=2 tw=79 :