Minimize product sum of two arrays

#[test]
fn test_all_ones() {
    let start = std::time::Instant::now();
    let val = Solution::min_product_sum(vec![1, 1, 1], vec![1, 1, 1]);
    let expected = 3;
    log_result!(val == expected, "test_all_ones", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example1() {
    let start = std::time::Instant::now();
    let val = Solution::min_product_sum(vec![5, 3, 4, 2], vec![4, 2, 2, 5]);
    let expected = 40;
    log_result!(val == expected, "test_example1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example2() {
    let start = std::time::Instant::now();
    let val = Solution::min_product_sum(vec![2, 1, 4, 5, 7], vec![3, 2, 4, 8, 6]);
    let expected = 65;
    log_result!(val == expected, "test_example2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_single() {
    let start = std::time::Instant::now();
    let val = Solution::min_product_sum(vec![3], vec![5]);
    let expected = 15;
    log_result!(val == expected, "test_single", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_two_elements() {
    let start = std::time::Instant::now();
    let val = Solution::min_product_sum(vec![1, 2], vec![3, 4]);
    let expected = 10;
    log_result!(val == expected, "test_two_elements", start, &expected, &val);
    assert_eq!(val, expected);
}