mod set_namespace {    use git_repository as git;    use git_repository::refs::transaction::PreviousValue;    use git_testtools::tempfile;     fn easy_repo_rw() -> crate::Result<(git::Repository, tempfile::TempDir)> {        crate::repo_rw("make_references_repo.sh")    }     #[test]    fn affects_edits_and_iteration() -> crate::Result {        let (mut repo, _keep) = easy_repo_rw()?;        assert_eq!(            repo.references()?.all()?.count(),            15,            "there are plenty of references in the default namespace"        );        assert!(repo.namespace().is_none(), "no namespace is set initially");        assert!(repo.set_namespace("foo")?.is_none(), "there is no previous namespace");         assert_eq!(            repo.references()?.all()?.filter_map(Result::ok).count(),            0,            "no references are in the namespace yet"        );         repo.tag_reference(            "new-tag",            git::ObjectId::empty_tree(git::hash::Kind::Sha1),            PreviousValue::MustNotExist,        )?;         repo.reference(            "refs/heads/new-branch",            git::ObjectId::empty_tree(git::hash::Kind::Sha1),            PreviousValue::MustNotExist,            "message",        )?;         assert_eq!(            repo.references()?                .all()?                .filter_map(Result::ok)                .map(|r| r.name().as_bstr().to_owned())                .collect::<Vec<_>>(),            vec!["refs/heads/new-branch", "refs/tags/new-tag"],            "namespaced references appear like normal ones"        );         assert_eq!(            repo.references()?                .prefixed("refs/tags/")?                .filter_map(Result::ok)                .map(|r| r.name().as_bstr().to_owned())                .collect::<Vec<_>>(),            vec!["refs/tags/new-tag"],            "namespaced references appear like normal ones"        );        let fully_qualified_tag_name = "refs/tags/new-tag";        assert_eq!(            repo.find_reference(fully_qualified_tag_name)?.name().as_bstr(),            fully_qualified_tag_name,            "fully qualified (yet namespaced) names work"        );        assert_eq!(            repo.find_reference("new-tag")?.name().as_bstr(),            fully_qualified_tag_name,            "namespaces are transparent"        );         let previous_ns = repo.clear_namespace().expect("namespace set");        assert_eq!(previous_ns.as_bstr(), "refs/namespaces/foo/");        assert!(repo.clear_namespace().is_none(), "it doesn't invent namespaces");         assert_eq!(            repo.references()?.all()?.count(),            17,            "it lists all references, also the ones in namespaces"        );        Ok(())    }} mod iter_references {    use git_repository as git;     use crate::util::hex_to_id;     fn repo() -> crate::Result<git::Repository> {        crate::repo("make_references_repo.sh").map(|r| r.to_thread_local())    }     #[test]    fn all() -> crate::Result {        let repo = repo()?;        assert_eq!(            repo.references()?                .all()?                .filter_map(Result::ok)                .map(|r| r.name().as_bstr().to_owned())                .collect::<Vec<_>>(),            vec![                "refs/d1",                "refs/heads/d1",                "refs/heads/dt1",                "refs/heads/main",                "refs/heads/multi-link-target1",                "refs/loop-a",                "refs/loop-b",                "refs/multi-link",                "refs/remotes/origin/HEAD",                "refs/remotes/origin/main",                "refs/remotes/origin/multi-link-target3",                "refs/tags/dt1",                "refs/tags/multi-link-target2",                "refs/tags/t1"            ]        );        Ok(())    }     #[test]    fn prefixed() -> crate::Result {        let repo = repo()?;        assert_eq!(            repo.references()?                .prefixed("refs/heads/")?                .filter_map(Result::ok)                .map(|r| (                    r.name().as_bstr().to_string(),                    r.target().try_id().map(ToOwned::to_owned)                ))                .collect::<Vec<_>>(),            vec![                (                    "refs/heads/d1".to_string(),                    Some(hex_to_id("134385f6d781b7e97062102c6a483440bfda2a03"))                ),                (                    "refs/heads/dt1".into(),                    hex_to_id("134385f6d781b7e97062102c6a483440bfda2a03").into()                ),                (                    "refs/heads/main".into(),                    hex_to_id("134385f6d781b7e97062102c6a483440bfda2a03").into()                ),                ("refs/heads/multi-link-target1".into(), None),            ]        );        Ok(())    }     #[test]    fn prefixed_and_peeled() -> crate::Result {        let repo = repo()?;        assert_eq!(            repo.references()?                .prefixed("refs/heads/")?                .peeled()                .filter_map(Result::ok)                .map(|r| (                    r.name().as_bstr().to_string(),                    r.target().try_id().map(ToOwned::to_owned)                ))                .collect::<Vec<_>>(),            vec![                (                    "refs/heads/d1".to_string(),                    Some(hex_to_id("134385f6d781b7e97062102c6a483440bfda2a03"))                ),                (                    "refs/heads/dt1".into(),                    hex_to_id("134385f6d781b7e97062102c6a483440bfda2a03").into()                ),                (                    "refs/heads/main".into(),                    hex_to_id("134385f6d781b7e97062102c6a483440bfda2a03").into()                ),                (                    "refs/remotes/origin/multi-link-target3".into(),                    hex_to_id("134385f6d781b7e97062102c6a483440bfda2a03").into()                ),            ]        );        Ok(())    }} mod head {     use git_ref::transaction::PreviousValue;    use git_repository as git;     use crate::util::hex_to_id;     #[test]    fn symbolic() -> crate::Result {        let repo = crate::basic_repo()?;        let head = repo.head()?;        match &head.kind {            git::head::Kind::Symbolic(r) => {                assert_eq!(                    r.target.try_id().map(ToOwned::to_owned),                    Some(hex_to_id("3189cd3cb0af8586c39a838aa3e54fd72a872a41"))                );            }            _ => panic!("unexpected head kind"),        }        assert_eq!(head.referent_name().expect("born").as_bstr(), "refs/heads/main");        assert!(!head.is_detached());        Ok(())    }     #[test]    fn detached() -> crate::Result {        let (repo, _keep) = crate::basic_rw_repo()?;        repo.reference(            "HEAD",            hex_to_id("3189cd3cb0af8586c39a838aa3e54fd72a872a41"),            PreviousValue::Any,            "",        )?;         let head = repo.head()?;        assert!(head.is_detached(), "head is detached");        assert!(head.referent_name().is_none());        Ok(())    }}