use git_odb::{linked::Store, pack, FindExt};use git_traverse::tree; use crate::hex_to_id; fn db() -> crate::Result<Store> {    let dir = git_testtools::scripted_fixture_repo_read_only("make_traversal_repo_for_trees.sh")?;    let db = Store::at(dir.join(".git").join("objects"))?;    Ok(db)} #[test]fn basic_nesting() -> crate::Result<()> {    let db = db()?;    let mut buf = Vec::new();    let mut buf2 = Vec::new();    let mut commit = db.find_existing_commit_iter(        hex_to_id("85df34aa34848b8138b2b3dcff5fb5c2b734e0ce"),        &mut buf,        &mut pack::cache::Never,    )?;    let mut recorder = tree::Recorder::default();    git_traverse::tree::breadthfirst(        db.find_existing_tree_iter(            commit.tree_id().expect("a tree is available in a commit"),            &mut buf2,            &mut pack::cache::Never,        )?,        tree::breadthfirst::State::default(),        |oid, buf| db.find_existing_tree_iter(oid, buf, &mut pack::cache::Never).ok(),        &mut recorder,    )?;     use git_object::tree::EntryMode::*;    use git_traverse::tree::recorder::Entry;    assert_eq!(        recorder.records,        vec![            Entry {                mode: Blob,                filepath: "a".into(),                oid: hex_to_id("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391")            },            Entry {                mode: Blob,                filepath: "b".into(),                oid: hex_to_id("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391")            },            Entry {                mode: Blob,                filepath: "c".into(),                oid: hex_to_id("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391")            },            Entry {                mode: Tree,                filepath: "d".into(),                oid: hex_to_id("496d6428b9cf92981dc9495211e6e1120fb6f2ba")            },            Entry {                mode: Tree,                filepath: "e".into(),                oid: hex_to_id("4277b6e69d25e5efa77c455340557b384a4c018a")            },            Entry {                mode: Tree,                filepath: "f".into(),                oid: hex_to_id("70fb16fc77b03e16acb4a5b1a6caf79ba302919a")            },            Entry {                mode: Blob,                filepath: "d/a".into(),                oid: hex_to_id("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391")            },            Entry {                mode: Blob,                filepath: "e/b".into(),                oid: hex_to_id("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391")            },            Entry {                mode: Blob,                filepath: "f/c".into(),                oid: hex_to_id("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391")            },            Entry {                mode: Tree,                filepath: "f/d".into(),                oid: hex_to_id("5805b676e247eb9a8046ad0c4d249cd2fb2513df")            },            Entry {                mode: Blob,                filepath: "f/z".into(),                oid: hex_to_id("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391")            },            Entry {                mode: Blob,                filepath: "f/d/x".into(),                oid: hex_to_id("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391")            }        ]    );    Ok(())}