pause-poll/src/main.test.ts

Promisify setTimeout & setInterval

import { pause } from './main.js'

beforeEach(jest.useFakeTimers as any)

describe('pause', () => {
  it('pauses for 1s and returns 1', async () => {
    const mock = jest.spyOn(global, 'setTimeout')
    const promise = pause(1000, () => 1)
    jest.runAllTimers()
    expect(await promise).toBe(1)
    expect(mock).toBeCalledTimes(1)
    expect(mock).lastCalledWith(expect.any(Function), 1000)
  })

  it('pauses for 1s and returns [1, 2, 3]', async () => {
    const mock = jest.spyOn(global, 'setTimeout')
    const promise = pause(1000, (a, b, c) => [a, b, c], 1, 2, 3)
    jest.runAllTimers()
    expect(await promise).toEqual([1, 2, 3])
    expect(mock).toBeCalledTimes(1)
    expect(mock).lastCalledWith(expect.any(Function), 1000)
  })
  // it('pauses for 1s and returns [1, 2, 3]', async () => {
  //   const data = await pause(1000, (a, b, c) => [a, b, c], 1, 2, 3)
  //   expect(data).toEqual([1, 2, 3])
  // })
  // it('pauses for 1s and throws Error', async () => {
  //   try {
  //     await pause(1000, () => {
  //       throw Error()
  //     })
  //   } catch (error) {
  //     expect(error).toEqual(Error())
  //   }
  // })
})