use std::path::Path; #[test]fn exe_invocation() {    let actual = gix_path::env::exe_invocation();    assert!(        !actual.as_os_str().is_empty(),        "it finds something as long as git is installed somewhere on the system (or a default location)"    );} #[test]fn shell() {    assert!(        Path::new(gix_path::env::shell()).exists(),        "On CI and on Unix we expect a usable path to the shell that exists on disk"    );} #[test]fn shell_absolute() {    assert!(        Path::new(gix_path::env::shell()).is_absolute(),        "On CI and on Unix we currently expect the path to the shell always to be absolute"    );} #[test]fn shell_unix_path() {    let shell = gix_path::env::shell()        .to_str()        .expect("This test depends on the shell path being valid Unicode");    assert!(        !shell.contains('\\'),        "The path to the shell should have no backslashes, barring strange `GIT_EXEC_PATH` values"    );} #[test]fn installation_config() {    assert_ne!(        gix_path::env::installation_config().map(|p| p.components().count()),        gix_path::env::installation_config_prefix().map(|p| p.components().count()),        "the prefix is a bit shorter than the installation config path itself"    );} #[test]fn core_dir() {    assert!(        gix_path::env::core_dir()            .expect("Git is always in PATH when we run tests")            .is_dir(),        "The core directory is a valid directory"    );} #[test]fn core_dir_program() {    let core_dir = gix_path::env::core_dir().expect("Git is always in PATH when we run tests");    let programs = std::fs::read_dir(core_dir)        .expect("the core directory can be listed")        .filter_map(Result::ok)        .filter(|entry| entry.file_type().is_ok_and(|t| t.is_file()))        .filter_map(|entry| {            let name = entry.file_name();            let stem = name.to_str()?.strip_suffix(std::env::consts::EXE_SUFFIX)?;            stem.starts_with("git-").then(|| stem.to_owned())        });    // Which programs are present as separate executables depends on how Git was built -    // Git for Windows, for instance, may not provide programs for builtin subcommands.    for stem in programs {        let path =            gix_path::env::core_dir_program(&stem).expect("a program listed in the core directory is found there");        assert!(path.is_file(), "the returned path refers to an existing file");        assert!(            path.is_absolute(),            "the path is absolute as it is based on `git --exec-path`"        );    }    assert_eq!(        gix_path::env::core_dir_program("git-program-that-does-not-exist"),        None,        "programs that don't exist in the core directory are not found"    );     for name in ["", ".", "..", "../git", "git/program", "/git"] {        assert_eq!(            gix_path::env::core_dir_program(name),            None,            "program names with path components are rejected"        );    }     #[cfg(windows)]    assert_eq!(        gix_path::env::core_dir_program(r"git\program"),        None,        "Windows path separators in program names are rejected"    );} #[test]fn system_prefix() {    assert_ne!(        gix_path::env::system_prefix(),        None,        "git should be present when running tests"    );} #[test]fn home_dir() {    assert_ne!(        gix_path::env::home_dir(),        None,        "we find a home on every system these tests execute"    );} mod xdg_config {    use std::ffi::OsStr;     #[test]    fn prefers_xdg_config_bases() {        let actual = gix_path::env::xdg_config("test", &mut |n| {            (n == OsStr::new("XDG_CONFIG_HOME")).then(|| "marker".into())        })        .expect("set");        #[cfg(unix)]        assert_eq!(actual.to_str(), Some("marker/git/test"));        #[cfg(windows)]        assert_eq!(actual.to_str(), Some(r"marker\git\test"));    }     #[test]    fn falls_back_to_home() {        let actual = gix_path::env::xdg_config("test", &mut |n| (n == OsStr::new("HOME")).then(|| "marker".into()))            .expect("set");        #[cfg(unix)]        assert_eq!(actual.to_str(), Some("marker/.config/git/test"));        #[cfg(windows)]        assert_eq!(actual.to_str(), Some(r"marker\.config\git\test"));    }}