use rhai::Engine;

#[test]
fn test_unary_minus() {
    let mut engine = Engine::new();

    assert_eq!(engine.eval::<i64>("let x = -5; x"), Ok(-5));
    assert_eq!(engine.eval::<i64>("fn n(x) { -x } n(5)"), Ok(-5));
    assert_eq!(engine.eval::<i64>("5 - -(-5)"), Ok(0));
}