random rejection

Return promises that may randomly return an error.

Usage

$ npm install --save random-rejection

const randomRejection = require('random-rejection')

API

Default

By default calling the function will just return a Promise that will instantly resolve or reject.

randomRejection()
  .then(val => {
    // if it resolves `val` will be "OK."
  })
  .catch(err => {
    // otherwise you get a `RandomError`
  })

Timed

A .timed([milliseconds]) method will use setTimeout to simulate an async call that will either resolve or reject. Optionally you can specify an amount of milliseconds that the Promise will wait to complete otherwise the time will be random.

// after roughly 1000 ms resolve or reject

randomRejection.timed(1000)
  .then(val => {
    // if it resolves `val` will be "OK."
  })
  .catch(err => {
    // otherwise you get a `RandomError`
  })

All

Finally, a method is provided which will return an array of Promises each of which are timed randomly and any of them will potentially reject.

Promise.all(randomRejection.all())
  .then(vals => {
    // if it resolves `vals` will be an array of "OK."'s
  })
  .catch(err => {
    // otherwise you get a `RandomError`
  })