#[cfg(test)]
mod examples {
    use day30::max_value;

    #[test]
    fn example1() {
        assert_eq!(max_value(276, '3'), Ok(3276));
    }

    #[test]
    fn example2() {
        assert_eq!(max_value(-999, '4'), Ok(-4999));
    }

    #[test]
    fn example3() {
        assert_eq!(max_value(0, '3'), Ok(30));
    }

    #[test]
    fn example4() {
        assert_eq!(max_value(860, '7'), Ok(8760));
    }
}