rustlings/exercises/15_traits/traits4.rs

// traits4.rs
//
// 您的任務是替換 '??' 部分以使代碼通過編譯。
//
// 除了標記的行外，不要更改任何行。
//
// 執行 `rustlings hint traits4` 或使用 `hint` watch 子命令來獲取提示。

// I AM NOT DONE

pub trait Licensed {
    fn licensing_info(&self) -> String {
        "some information".to_string()
    }
}

struct SomeSoftware {}

struct OtherSoftware {}

impl Licensed for SomeSoftware {}
impl Licensed for OtherSoftware {}

// 您只能更改下一行
fn compare_license_types(software: ??, software_two: ??) -> bool {
    software.licensing_info() == software_two.licensing_info()
}

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

    #[test]
    fn compare_license_information() {
        let some_software = SomeSoftware {};
        let other_software = OtherSoftware {};

        assert!(compare_license_types(some_software, other_software));
    }

    #[test]
    fn compare_license_information_backwards() {
        let some_software = SomeSoftware {};
        let other_software = OtherSoftware {};

        assert!(compare_license_types(other_software, some_software));
    }
}