address 0.19.0

This library aids in processing network addresses.
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use crate::{Domain, DomainRef};
use std::fmt::{Display, Formatter};

impl Display for Domain {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        self.to_ref().fmt(f)
    }
}

impl<'a> Display for DomainRef<'a> {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        f.pad(self.name())
    }
}

#[cfg(test)]
mod tests {
    use crate::Domain;

    #[test]
    fn display() {
        let domain: Domain = Domain::localhost();

        let result: String = domain.to_string();
        let expected: &str = "localhost";
        assert_eq!(result, expected);
    }
}