rust_book_code 0.2.1

The code of rust book
Documentation 
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pub fn add(left: usize, right: usize) -> usize {
    left + right
}

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

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

pub struct Guess {
    value: i32,
}

impl Guess {
    pub fn new(value: i32) -> Guess {
        if value < 1 {
            panic!(
                "Guess value must be greater than or equal to 1, got {}.",
                value
            );
        } else if value > 100 {
            panic!(
                "Guess value must be less than or equal to 100, got {}.",
                value
            );
        }

        Guess { value }
    }
}

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

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

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

    // #[test]
    // fn exploration() {
    //     assert_eq!(2 + 2, 4);
    // }
    //
    // #[test]
    // #[should_panic]
    // fn another() {
    //     panic!("Make this test fail");
    // }
    //
    // #[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_cannot_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(expected = "Guess value must be less than or equal to 100")]
    // fn greater_than_100() {
    //     Guess::new(200);
    // }
    //
    // #[test]
    // fn it_works() -> Result<(), String> {
    //     if 2 + 2 == 4 {
    //         Ok(())
    //     } else {
    //         Err(String::from("two plus two does not equal four"))
    //     }
    // }
}