use gix_config::parse::EventRef; pub fn header_event(name: &'static str, subsection: impl Into<Option<&'static str>>) -> EventRef<'static> {    let subsection_name = subsection.into();    EventRef::SectionHeader {        name: name.into(),        separator: subsection_name.map(|_| " ".into()),        subsection_name: subsection_name.map(Into::into),    }} mod header {    use gix_config::file::IntoBStringOpt;     fn serialized(        name: &str,        subsection: impl IntoBStringOpt,    ) -> Result<bstr::BString, gix_config::parse::section::header::Error> {        let mut config = gix_config::File::default();        let section = config.new_section(name, subsection.into_bstring_opt())?;        Ok(section.header().to_bstring())    }     mod write_to {        use crate::parse::section::header::serialized;         #[test]        fn subsection_backslashes_and_quotes_are_escaped() -> crate::Result {            assert_eq!(serialized("core", r"a\b")?, r#"[core "a\\b"]"#);            assert_eq!(serialized("core", r#"a:"b""#)?, r#"[core "a:\"b\""]"#);            Ok(())        }         #[test]        fn everything_is_allowed() -> crate::Result {            assert_eq!(serialized("core", "a/b \t\t a\\b")?, "[core \"a/b \t\t a\\\\b\"]");            Ok(())        }    }    mod new {        use gix_config::parse::section;         use crate::parse::section::header::serialized;         #[test]        fn names_must_be_mostly_ascii() {            for name in ["🤗", "x.y", "x y", "x\ny"] {                assert_eq!(serialized(name, None), Err(section::header::Error::InvalidName));            }        }         #[test]        fn subsections_with_newlines_and_null_bytes_are_rejected() {            assert_eq!(serialized("a", "a\nb"), Err(section::header::Error::InvalidSubSection));            assert_eq!(serialized("a", "a\0b"), Err(section::header::Error::InvalidSubSection));        }    }}mod name {    use gix_config::parse::section::Name;     fn name(name: &str) -> Name {        Name::try_from(name).expect("valid section name")    }     #[test]    fn alphanum_and_dash_are_valid() {        assert!(Name::try_from("1a").is_ok());        assert!(Name::try_from("Hello-World").is_ok());    }     #[test]    fn rejects_invalid_format() {        assert!(Name::try_from("").is_err());        assert!(Name::try_from("a.2").is_err());        assert!(Name::try_from("\"").is_err());        assert!(Name::try_from("##").is_err());    }     #[test]    fn case_insensitive_eq() {        assert_eq!(name("Co-Re"), name("cO-rE"));    }}