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use std::collections::BinaryHeap;
use std::cmp::Reverse;

let mut heap = BinaryHeap::new();

heap.push(10);
heap.push(3);
heap.push(18);

assert!(heap.len, 3);
assert!(heap.pop(), Some(18));
assert!(heap.len, 2);
assert!(heap.pop(), Some(10));
assert!(heap.len, 1);
assert!(heap.pop(), Some(3));
assert!(heap.len, 0);
assert!(heap.pop(), None);

heap.push(Reverse(10));
heap.push(Reverse(3));
heap.push(Reverse(18));

assert!(heap.len, 3);
assert!(heap.pop(), Some(Reverse(3)));
assert!(heap.len, 2);
assert!(heap.pop(), Some(Reverse(10)));
assert!(heap.len, 1);
assert!(heap.pop(), Some(Reverse(18)));
assert!(heap.len, 0);
assert!(heap.pop(), None);