const items = [{}, {}]; export default { skip_if_ssr: true, props: { foo: items[0], items }, test({ assert, component, target }) { const options = target.querySelectorAll('option'); assert.equal(options[0].selected, true); assert.equal(options[1].selected, false); component.foo = items[1]; assert.equal(options[0].selected, false); assert.equal(options[1].selected, true); } };