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#[derive(Clone, Copy, Debug, PartialEq)]
pub enum Player {
    Black,
    White,
}

impl Player {
    pub fn switch(&self) -> Player {
        match self {
            Player::White => Player::Black,
            Player::Black => Player::White,
        }
    }
}

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

    #[test]
    fn switch() {
        assert_eq!(Player::White.switch(), Player::Black);
        assert_eq!(Player::Black.switch(), Player::White);
    }
}