use super::*;

#[test]
fn keepenv_emits_setenv_for_present_key() {
    let parent = vec![("XDG_RUNTIME_DIR".into(), "/run/user/1000".into())];
    let args = keepenv_args(&["XDG_RUNTIME_DIR".into()], &parent);
    assert_eq!(args, vec!["--setenv", "XDG_RUNTIME_DIR", "/run/user/1000"]);
}

#[test]
fn keepenv_skips_absent_keys() {
    let parent = vec![("HOME".into(), "/home/me".into())];
    let args = keepenv_args(&["XDG_RUNTIME_DIR".into()], &parent);
    assert!(args.is_empty());
}

#[test]
fn keepenv_preserves_caller_key_order() {
    let parent = vec![
        ("B".into(), "2".into()),
        ("A".into(), "1".into()),
        ("C".into(), "3".into()),
    ];
    let args = keepenv_args(&["A".into(), "B".into(), "C".into()], &parent);
    assert_eq!(
        args,
        vec![
            "--setenv", "A", "1", "--setenv", "B", "2", "--setenv", "C", "3"
        ]
    );
}

#[test]
fn keepenv_empty_keys_yields_nothing() {
    let parent = vec![("A".into(), "1".into())];
    assert!(keepenv_args(&[], &parent).is_empty());
}