12345678910111213141516
import {all} from './all'
const list = [0, 1, 2, 3, 4]
test('when true', () => {  const fn = x => x > -1
  expect(all(fn)(list)).toBeTrue()})
test('when false', () => {  const fn = x => x > 2
  expect(all(fn, list)).toBeFalse()})