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

    #[test]
    fn larger_can_hold_smaller() {
        let larger = Rectangle {
            width: 8,
            height: 7,
        };
        let smaller = Rectangle {
            width: 5,
            height: 1,
        };

        assert!(larger.can_hold(&smaller));
    }

    #[test]
    fn smaller_can_hold_larger() {
        let larger = Rectangle {
            width: 8,
            height: 7,
        };
        let smaller = Rectangle {
            width: 5,
            height: 1,
        };

        assert!(!smaller.can_hold(&larger));
    }

    #[test]
    fn it_adds_two() {
        assert_eq!(4, add_two(2));
    }

    #[test]
    fn greeting_contains_name() {
        let result = greeting("Carol");
        assert!(
            result.contains("Carol"),
            "Greeting did not contain name, value was `{}`",
            result,
        );
    }
    #[test]
    #[should_panic]
    fn greater_than_100() {
        Guess::new(200);
    }
}

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

pub fn add_two(a: i32) -> i32 {
    a + 2
}

pub fn greeting(name: &str) -> String {
    format!("Hello {}!", name)
}

#[derive(Debug)]
pub struct Rectangle {
    width: u32,
    height: u32,
}

impl Rectangle {
    pub fn area(&self) -> u32 {
        self.width * self.height
    }

    pub fn can_hold(&self, other: &Rectangle) -> bool {
        self.width > other.width && self.height > other.height
    }

    pub fn square(size: u32) -> Rectangle {
        Rectangle {
            width: size,
            height: size,
        }
    }
}

pub struct Guess {
    value: i32,
}

impl Guess {
    pub fn new(value: i32) -> Guess {
        if value < 1 || value > 100 {
            panic!("Guess value must be between 1 and 100, got {}", value);
        }

        Guess { value }
    }

    pub fn run(&self) {
        println!("{}", self.value);
    }
}