mod prefix {    use git_refspec::{parse::Operation, RefSpec};     #[test]    fn partial_refs_have_no_prefix() {        assert_eq!(parse("main").to_ref().prefix(), None);    }     #[test]    fn short_absolute_refs_have_no_prefix() {        assert_eq!(parse("refs/short").to_ref().prefix(), None);    }     #[test]    fn full_names_have_a_prefix() {        assert_eq!(parse("refs/heads/main").to_ref().prefix().unwrap(), "refs/heads/");        assert_eq!(parse("refs/foo/bar").to_ref().prefix().unwrap(), "refs/foo/");        assert_eq!(            parse("refs/heads/*:refs/remotes/origin/*").to_ref().prefix().unwrap(),            "refs/heads/"        );    }     #[test]    fn strange_glob_patterns_have_no_prefix() {        assert_eq!(parse("refs/*/main:refs/*/main").to_ref().prefix(), None);    }     #[test]    fn object_names_have_no_prefix() {        assert_eq!(            parse("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391").to_ref().prefix(),            None        );    }     fn parse(spec: &str) -> RefSpec {        git_refspec::parse(spec.into(), Operation::Fetch).unwrap().to_owned()    }}