use subject_source::string::utf8::char_at;

#[test]
pub fn char_at_empty() {
    assert_eq!(char_at("", 0), None);
}

#[test]
pub fn char_at_emoji() {
    assert_eq!(char_at("🙂🙁", 1), Some('🙁'));
}

#[test]
pub fn char_at_oob() {
    assert_eq!(char_at("abc", 3), None);
}

#[test]
pub fn char_at_ascii() {
    assert_eq!(char_at("abc", 1), Some('b'));
}