fn printed_eval_result(src: &str) -> Option<String> {

    let program = nomiscript::Reader::parse(src).unwrap();

    run_nomiscript_eval(&program)

        .map(nomiscript::Value::from)

        .map(|value| nomiscript::format_value(&value))

}

fn a_true_bool_result_decodes_and_prints_as_t() {

    assert_eq!(printed_eval_result("(= 1 1)").as_deref(), Some("t"));

}

fn a_false_bool_result_decodes_and_prints_as_nil() {

    assert_eq!(printed_eval_result("(= 1 2)").as_deref(), Some("nil"));

}

fn a_null_pair_result_decodes_as_nil() {

    let engine = build_engine(EngineOpts::baseline()).unwrap();

    let mut store: Store<()> = Store::new(&engine, ());

    let decoded = decode_eval_result(

        &mut store,

        None,

        Some(nomiscript::WasmType::PairRef(nomiscript::PairElement::I32)),

    .unwrap();

    assert_eq!(decoded, EvalValue::Nil);

}