ue);
    assert_equals(map.get(name).toString(), value.toString());
}

// Verifies that the specified value is NOT accepted by set().
function verify_map_not_set(map, name, value) {
    assert_throws_js(TypeError, () => {
        map.set(name, value);
    });
}

// Verifies that the specified value is NOT accepted by append().
function verify_map_no_append(map, name, value) {
    assert_throws_js(TypeError, () => {
        map.append(name, value);
    });
}

// Verifies that the property 'name' shows up on 