use crate::{check_common, inspect_refs, make_readonly_repo};use git_commitgraph::Graph; #[test]fn single_parent() -> crate::Result {    let repo_dir = make_readonly_repo("single_parent.sh");    let refs = inspect_refs(&repo_dir, &["parent", "child"]);    let cg = Graph::from_info_dir(repo_dir.join(".git").join("objects").join("info"))?;    check_common(&cg, &refs);     assert_eq!(cg.commit_at(refs["parent"].pos()).generation(), 1);    assert_eq!(cg.commit_at(refs["child"].pos()).generation(), 2);     Ok(())} #[test]fn octupus_merges() -> crate::Result {    let repo_dir = make_readonly_repo("octopus_merges.sh");    let refs = inspect_refs(        &repo_dir,        &[            "root",            "parent1",            "parent2",            "parent3",            "parent4",            "three_parents",            "four_parents",        ],    );    let cg = Graph::from_info_dir(repo_dir.join(".git").join("objects").join("info"))?;    check_common(&cg, &refs);     assert_eq!(cg.commit_at(refs["root"].pos()).generation(), 1);    assert_eq!(cg.commit_at(refs["parent1"].pos()).generation(), 2);    assert_eq!(cg.commit_at(refs["parent2"].pos()).generation(), 2);    assert_eq!(cg.commit_at(refs["parent3"].pos()).generation(), 2);    assert_eq!(cg.commit_at(refs["parent4"].pos()).generation(), 2);    assert_eq!(cg.commit_at(refs["three_parents"].pos()).generation(), 3);    assert_eq!(cg.commit_at(refs["four_parents"].pos()).generation(), 3);     Ok(())} #[test]fn single_commit() -> crate::Result {    let repo_dir = make_readonly_repo("single_commit.sh");    let refs = inspect_refs(&repo_dir, &["commit"]);    let cg = Graph::from_info_dir(repo_dir.join(".git").join("objects").join("info"))?;    check_common(&cg, &refs);     assert_eq!(cg.commit_at(refs["commit"].pos()).generation(), 1);     Ok(())} #[test]fn two_parents() -> crate::Result {    let repo_dir = make_readonly_repo("two_parents.sh");    let refs = inspect_refs(&repo_dir, &["parent1", "parent2", "child"]);    let cg = Graph::from_info_dir(repo_dir.join(".git").join("objects").join("info"))?;    check_common(&cg, &refs);     assert_eq!(cg.commit_at(refs["parent1"].pos()).generation(), 1);    assert_eq!(cg.commit_at(refs["parent2"].pos()).generation(), 1);    assert_eq!(cg.commit_at(refs["child"].pos()).generation(), 2);     Ok(())}