fn an_existing_tree_is_removed() {

    let dir = tempfile::tempdir().unwrap();

    let tree = dir.path().join("coverage");

    std::fs::create_dir_all(tree.join("nested")).unwrap();

    std::fs::write(tree.join("nested/index.html"), "stale").unwrap();

    remove_dir_if_present(&tree).unwrap();

    assert!(!tree.exists());

}

fn a_missing_tree_is_not_an_error() {

    let dir = tempfile::tempdir().unwrap();

    remove_dir_if_present(&dir.path().join("absent")).unwrap();

}

fn a_tree_that_cannot_be_removed_is_an_error() {

    let dir = tempfile::tempdir().unwrap();

    let file = dir.path().join("not-a-dir");

    std::fs::write(&file, "x").unwrap();

    assert!(remove_dir_if_present(&file).is_err());

}

fn an_existing_file_is_removed() {

    let dir = tempfile::tempdir().unwrap();

    let file = dir.path().join("disdoc.html");

    std::fs::write(&file, "stale").unwrap();

    remove_file_if_present(&file).unwrap();

    assert!(!file.exists());

}

fn a_missing_file_is_not_an_error() {

    let dir = tempfile::tempdir().unwrap();

    remove_file_if_present(&dir.path().join("absent.html")).unwrap();

}

fn a_file_that_cannot_be_removed_is_an_error() {

    let dir = tempfile::tempdir().unwrap();

    assert!(remove_file_if_present(dir.path()).is_err());

}

fn only_not_found_is_ignored() {

    assert!(ignore_not_found(Err(io::Error::from(ErrorKind::NotFound))).is_ok());

    assert!(ignore_not_found(Err(io::Error::from(ErrorKind::PermissionDenied))).is_err());

    assert!(ignore_not_found(Ok(())).is_ok());

}