Enum.rs

#[derive(PartialEq, Debug)]
enum Language {
    ENGLISH,
    PORTUGUESE,
}

fn select_language(language: Language) -> Language {
    match language {
        Language::ENGLISH => println!("English selected"),
        Language::PORTUGUESE => println!("Portuguese selectionado"),
    }

    language
}

fn main() {
    select_language(Language::ENGLISH);
}

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

    #[test]
    fn internal() {
        assert_eq!(Language::ENGLISH, select_language(Language::ENGLISH));
        assert_eq!(Language::PORTUGUESE, select_language(Language::PORTUGUESE));
    }
}