heap-data-structure/specification

import {tester} from '../tester.js';

export function _popreference(
    _test,
    length,
    heapname,
    makeHeap,
    diffname,
    diff,
    n,
) {
    const title = `Heap popreference (${heapname}, ${diffname}, ${n})`;

    _test(title, (t) => {
        const q = makeHeap(diff);
        const a = [];

        if (length) t.deepEqual(q.length, 0, 'check length zero');

        let i = n;
        while (i--) {
            const x = Math.random();
            q.push(x);
            a.push(x);
            if (length) t.deepEqual(q.length, a.length);
        }

        i = n;
        const b = [];

        while (i--) {
            b.push(q.popreference().value);
            if (length) t.deepEqual(q.length, i);
        }

        a.sort(diff);

        t.deepEqual(b, a, 'check sorted');

        t.deepEqual(q.popreference(), null, '2nd empty pop');

        if (length) t.deepEqual(q.length, 0, 'check length zero');
    });
}

export const popreference = tester(_popreference);