Sum of digits in the minimum number

#[test]
fn test_all_same() {
    let start = std::time::Instant::now();
    let val = Solution::sum_of_digits(vec![5, 5, 5]);
    let expected = 0;
    log_result!(val == expected, "test_all_same", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_even_digit_sum() {
    let start = std::time::Instant::now();
    let val = Solution::sum_of_digits(vec![22, 44, 66]);
    let expected = 1;
    log_result!(val == expected, "test_even_digit_sum", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example1() {
    let start = std::time::Instant::now();
    let val = Solution::sum_of_digits(vec![34, 23, 1, 24, 75, 33, 54, 8]);
    let expected = 0;
    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::sum_of_digits(vec![99, 77, 33, 66, 55]);
    let expected = 1;
    log_result!(val == expected, "test_example2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_single_element() {
    let start = std::time::Instant::now();
    let val = Solution::sum_of_digits(vec![10]);
    let expected = 0;
    log_result!(val == expected, "test_single_element", start, &expected, &val);
    assert_eq!(val, expected);
}