//! # Restaurant
//!
//! `restaurant` 是一个rust示例合集

mod cacher;
pub mod adder;
mod guess;
mod front_of_house;

pub use crate::front_of_house::hosting;

pub fn eat_at_restaurant() {
    hosting::add_to_waitlist();
    hosting::add_to_waitlist();
    hosting::add_to_waitlist();
}

#[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
    }
}

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

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

fn prints_and_returns_10(a: i32) -> i32 {
    println!("I got the value {}", a);
    10
}

#[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_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"));
    }

    #[test]
    fn greeting_contains_name_with_msg() {
        let result = greeting("Carol");
        // 增加一个自定义失败信息参数：带占位符的格式字符串，以及 greeting 函数的值
        assert!(
            result.contains("Carol"),
            "Greeting did not contain name, value was `{}`", result
        );
    }

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

    // 默认情况下，当测试通过时，Rust 的测试库会截获打印到标准输出的所有内容。
    // 比如在测试中调用了 println! 而测试通过了，我们将不会在终端看到 println! 的输出
    #[test]
    fn this_test_will_pass() {
        let value = prints_and_returns_10(4);
        assert_eq!(10, value);
    }

    // 如果测试失败了，则会看到所有标准输出和其他错误信息
    #[test]
    fn this_test_will_fail() {
        let value = prints_and_returns_10(8);
        assert_eq!(5, value);
    }

    #[test]
    #[ignore]
    fn expensive_test() {
        // 需要运行一个小时的代码
    }

}