let fulfil; let thePromise = new Promise(f => { fulfil = f; }); export default { data: { thePromise }, html: ``, test(assert, component, target) { fulfil(42); return thePromise .then(() => { assert.htmlEqual(target.innerHTML, `

the value is 42

`); let reject; thePromise = new Promise((f, r) => { reject = r; }); component.set({ thePromise }); assert.htmlEqual(target.innerHTML, ``); reject(new Error('something broke')); return thePromise.catch(() => {}); }) .then(() => { assert.htmlEqual(target.innerHTML, `

oh no! something broke

`); }); } };