use git_index::{verify::extensions::no_find, State};use git_repository as git;use git_repository::prelude::FindExt;use git_testtools::scripted_fixture_read_only_standalone; #[test]fn from_tree() -> crate::Result {    let fixtures = [        "make_index/v2.sh",        "make_index/v2_more_files.sh",        "make_index/v2_all_file_kinds.sh",        "make_index/v4_more_files_IEOT.sh",    ];     for fixture in fixtures {        let repo_dir = scripted_fixture_read_only_standalone(fixture)?;        let repo = git::open(&repo_dir)?;         let tree_id = repo.head_commit()?.tree_id()?;         let expected_state = repo.index()?;        let actual_state = State::from_tree(&tree_id, |oid, buf| repo.objects.find_tree_iter(oid, buf).ok())?;         compare_states(&actual_state, &expected_state, fixture)    }    Ok(())} #[test]fn new() {    let state = State::new(git_hash::Kind::Sha1);    assert_eq!(state.entries().len(), 0);    assert_eq!(state.version(), git_index::Version::V2);    assert_eq!(state.object_hash(), git_hash::Kind::Sha1);} fn compare_states(actual: &State, expected: &State, fixture: &str) {    actual.verify_entries().expect("valid");    actual.verify_extensions(false, no_find).expect("valid");     assert_eq!(        actual.entries().len(),        expected.entries().len(),        "entry count mismatch in {:?}",        fixture    );     for (a, e) in actual.entries().iter().zip(expected.entries()) {        assert_eq!(a.id, e.id, "entry id mismatch in {:?}", fixture);        assert_eq!(a.flags, e.flags, "entry flags mismatch in {:?}", fixture);        assert_eq!(a.mode, e.mode, "entry mode mismatch in {:?}", fixture);        assert_eq!(a.path(actual), e.path(expected), "entry path mismatch in {:?}", fixture);    }}