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

    #[test]
    fn it_works() -> Result<(), String> {
        if 2 + 2 == 4 {
            Ok(())
        }
        else {
            Err(String::from("two plus two does not equal four"))
        }
    }

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

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

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

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

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

    #[test]
    fn it_wont_add_two() {
        assert_ne!(4, add_two(3));
    }

    #[test]
    fn greeting_contains_name() {
        let result = greeting("adam");
        assert!(result.contains("adam"));
    }

    #[test]
    #[should_panic(expected = "must be between 1 and 100")]
    fn greater_than_100() {
        Guess::new(200);
    }
}

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

pub struct Guess {
    value: i32,
}

impl Guess {
    pub fn new(value: i32) -> Guess {
        if value < 1 || value > 100 {
            panic!("must be between 1 and 100, not {}", value);
        }
        //if value < 1 {
        //    panic!("must be greater than 1, not {}", value);
        //}
        //else if value > 100 {
        //    panic!("must be less than 100, not {}", value);
        //}

        Guess { value }
    }
}

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

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

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