export default { props: { x: true, value: 'one' }, html: ` <div> <input> <span>x</span> </div> `, test({ assert, component, target, window, raf }) { const div = target.querySelector('div'); const { appendChild, insertBefore } = div; div.appendChild = div.insertBefore = () => { throw new Error('DOM was mutated'); }; component.value = 'two'; }, };