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//! # My Crate
//!
//! `dmitri_mamrukov_crate` is a collection of utilities to make performing
//! certain calculations more convenient.

/// Adds one to the number given.
///
/// # Examples
/// ```
/// let five = 5;
///
/// assert_eq!(6, dmitri_mamrukov_crate::add_one(5));
/// ```
pub fn add_one(x: i32) -> i32 {
    x + 1
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn negative() {
        assert_eq!(0, add_one(-1));
    }

    #[test]
    fn zero() {
        assert_eq!(1, add_one(0));
    }

    #[test]
    fn positive() {
        assert_eq!(2, add_one(1));
    }
}