wait.spec.js

import { wait } from './wait'

test('happy path', async () => {
  const fn = x => Promise.resolve(x + 1)
  const [ result, err ] = await wait(fn(1))

  expect(result).toBe(2)
  expect(err).toBeUndefined()
})

test('when promise is rejected', async () => {
  const fn = x => Promise.reject(Error('foo'))
  const [ result, err ] = await wait(fn(1))

  expect(result).toBeUndefined()
  expect(err).toEqual(Error('foo'))
})