#[cfg(test)]
mod tests {
    use pyority_queue::backing::pure::{binary_heap::BinaryHeap, PureBacking};

    #[test]
    fn test_pure_binary_heap() {
        let mut heap = BinaryHeap::new();
        assert_eq!(heap.len(), 0);
        heap.add(4);
        assert_eq!(heap.len(), 1);
        heap.add(-3);
        assert_eq!(heap.len(), 2);
        heap.add(6);
        assert_eq!(heap.len(), 3);
        heap.add(1);
        assert_eq!(heap.len(), 4);
        assert_eq!(heap.pop(), Some(-3));
        assert_eq!(heap.len(), 3);
        assert_eq!(heap.pop(), Some(1));
        assert_eq!(heap.len(), 2);
        assert_eq!(heap.pop(), Some(4));
        assert_eq!(heap.len(), 1);
        assert_eq!(heap.pop(), Some(6));
        assert_eq!(heap.len(), 0);
        assert_eq!(heap.pop(), None);
        assert_eq!(heap.len(), 0);
    }
}