const items = [ { id: 'a' }, { id: 'b' } ]; export default { 'skip-ssr': true, data: { foo: 'b', items }, test ( assert, component, target ) { const options = target.querySelectorAll( 'option' ); assert.equal( options[0].selected, false ); assert.equal( options[1].selected, true ); component.set( { foo: items[0].id } ); assert.equal( options[0].selected, true ); assert.equal( options[1].selected, false ); } };