tests/worker/thread-worker.test.mjs

   1 import { expect } from 'expect'
   2 import { restore, stub } from 'sinon'
   3 import { ThreadWorker } from '../../lib/index.js'
   4
   5 describe('Thread worker test suite', () => {
   6   class SpyWorker extends ThreadWorker {
   7     constructor (fn) {
   8       super(fn)
   9       this.port = { postMessage: stub().returns() }
  10     }
  11   }
  12
  13   afterEach(() => {
  14     restore()
  15   })
  16
  17   it('Verify that handleError() method is working properly', () => {
  18     const error = new Error('Error as an error')
  19     const worker = new ThreadWorker(() => {})
  20     expect(worker.handleError(error)).toBeInstanceOf(Error)
  21     expect(worker.handleError(error)).toStrictEqual(error)
  22     const errorMessage = 'Error as a string'
  23     expect(worker.handleError(errorMessage)).toStrictEqual(errorMessage)
  24   })
  25
  26   it('Verify worker invokes the postMessage() method on port property', () => {
  27     const worker = new SpyWorker(() => {})
  28     worker.sendToMainWorker({ ok: 1 })
  29     expect(worker.port.postMessage.calledOnce).toBe(true)
  30   })
  31 })