use crate::file::store_with_packed_refs;use crate::packed::write_packed_refs_with; #[test]fn sorted_buffer_works() {    let store = store_with_packed_refs().unwrap();    store.packed().unwrap();} #[test]fn empty_buffers_cannot_be_opened() -> crate::Result {    let (_keep, path) = write_packed_refs_with(&[])?;    assert!(        git_ref::packed::Buffer::open(path, 512).is_err(),        "they probably count as unsorted which isn't allowed"    );    Ok(())} #[test]fn unsorted_buffers_cannot_currently_be_opened() -> crate::Result {    // these are legacy and could be transformed on the fly, see https://github.com/git/git/blob/master/refs/packed-backend.c#L320:L320    for (packed_refs_data, memmap_cutoff) in &[        (&b"# pack-refs with: peeled fully-peeled \nsomething else"[..], 20u64),        (&b"starts with a bogus record, not a header anyway"[..], 32 * 1024),    ] {        let (_keep, path) = write_packed_refs_with(packed_refs_data)?;         match git_ref::packed::Buffer::open(path, *memmap_cutoff) {            Ok(_) => unreachable!("unsorted buffers can't be opened"),            Err(err) => assert_eq!(                err.to_string(),                "The packed-refs file did not have a header or wasn't sorted."            ),        }    }    Ok(())}