// Copyright © 2026 Mikhail Hogrefe
//
// This file is part of Malachite.
//
// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.

use itertools::Itertools;
use malachite_base::num::basic::traits::Zero;
use malachite_base::strings::ToDebugString;
use malachite_nz::integer::Integer;
use malachite_nz::integer::exhaustive::exhaustive_integer_range_to_negative_infinity;

fn exhaustive_integer_range_to_negative_infinity_helper(a: Integer, values: &str) {
    let xs = exhaustive_integer_range_to_negative_infinity(a)
        .take(20)
        .collect_vec()
        .to_debug_string();
    assert_eq!(xs, values);
}

#[test]
fn test_exhaustive_integer_range_to_negative_infinity() {
    exhaustive_integer_range_to_negative_infinity_helper(
        Integer::ZERO,
        "[0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -17, -18, -19]",
    );
    exhaustive_integer_range_to_negative_infinity_helper(
        Integer::from(-5),
        "[-5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -17, -18, -19, -20, -21, -22, \
        -23, -24]",
    );
    exhaustive_integer_range_to_negative_infinity_helper(
        Integer::from(5),
        "[0, 1, -1, 2, -2, 3, -3, 4, -4, 5, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14]",
    );
}
