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import { delay } from './delay.js'import { inc } from './inc.js'import { throttle } from './throttle.js'
test('with side effect', async () => {  let counter = 0
  const incFn = a => {    counter += a
    return counter  }  const incWrapped = throttle(incFn, 1000)  incWrapped(1)  incWrapped(1)  await delay(1500)  incWrapped(1)  expect(counter).toBe(2)})
test('return result', async () => {  const incWrapped = throttle(inc, 1000)  const results = []  results.push(incWrapped(1))  results.push(incWrapped(1))  await delay(1500)  results.push(incWrapped(1))  await delay(500)  results.push(incWrapped(1))  expect(results).toEqual([ 2, 2, 2, 2 ])})