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#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        let arg = 5;
        let answer = crate::add_one(arg);
        assert_eq!(6, answer);
    }
}

/// 加一操作
///
/// # 例子
///
/// ```
/// let arg = 5;
/// let answer = today_utils::add_one(arg);
///
/// assert_eq!(6, answer);
/// ```
pub fn add_one(x: i32) -> i32 {
    x + 1
}