use std::path::Path; use git_testtools::fixture_path; use crate::{file::store_with_packed_refs, packed::write_packed_refs_with}; #[test]fn sorted_buffer_works() {    let store = store_with_packed_refs().unwrap();    store.open_packed_buffer().unwrap();} #[test]fn empty_buffers_should_not_exist_but_are_fine_to_open() -> crate::Result {    let (_keep, path) = write_packed_refs_with(&[])?;    assert_eq!(git_ref::packed::Buffer::open(path, 512)?.iter()?.count(), 0);    Ok(())} #[test]fn unsorted_buffers_or_those_without_a_header_can_be_opened_and_searched() {    for (fixture, cutoff) in [("without-header", 20u64), ("unsorted", 32 * 1024)] {        let buffer = git_ref::packed::Buffer::open(            fixture_path(Path::new("packed-refs").join(fixture).to_str().expect("utf8")),            cutoff,        )        .unwrap();        for packed_ref in buffer.iter().unwrap().map(Result::unwrap) {            let found_ref = buffer                .find(packed_ref.name)                .expect("ref can be found as buffer is sorted");            assert_eq!(                found_ref, packed_ref,                "both reference are definitely equal, they are the same"            );        }    }} #[test]fn bogus_content_triggers_an_error() -> crate::Result {    let packed_refs_data = b"starts with a bogus record, not a header anyway";    let (_keep, path) = write_packed_refs_with(packed_refs_data)?;     match git_ref::packed::Buffer::open(path, 32) {        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 and could not be iterated"        ),    }    Ok(())}