Count commas in range

#[test]
fn test_boundary_1000() {
    let start = std::time::Instant::now();
    let val = Solution::count_commas(1000);
    let expected = 1;
    log_result!(val == expected, "test_boundary_1000", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_boundary_999() {
    let start = std::time::Instant::now();
    let val = Solution::count_commas(999);
    let expected = 0;
    log_result!(val == expected, "test_boundary_999", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example1() {
    let start = std::time::Instant::now();
    let val = Solution::count_commas(1002);
    let expected = 3;
    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::count_commas(998);
    let expected = 0;
    log_result!(val == expected, "test_example2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_max() {
    let start = std::time::Instant::now();
    let val = Solution::count_commas(100000);
    let expected = 99001;
    log_result!(val == expected, "test_max", start, &expected, &val);
    assert_eq!(val, expected);
}