forger/test/parallel.js

Async utilities and helpers for node

'use strict'
const
  should = require('should'),
  forger = require('../')

describe('#parallel()', function () {
  let parallel = forger.parallel

  it('should execute all methods and resolve', function (done) {
    let
      counter = 0,
      results = [],
      makeFunc = function (timeout) {
          return function(next) {
            setTimeout(() => {
              results.push(timeout)
              next()
            }, timeout)
          }
      }

    parallel(
      makeFunc(30),
      makeFunc(20),
      makeFunc(10)
    ).then(() => {
      results.should.match([10, 20, 30]).and.be.an.Array();
      done()
    }).catch((err) => {
      done(err)
    })
  })

  it('should reject upon first error', function (done) {
    let
      errMsg = 'Expected error',
      solved = 0,
      goodFn = function (next) { solved++; next() },
      badFn = function (next) { setTimeout(() => {
        next(new Error(errMsg))
      })}

    parallel(goodFn, badFn, goodFn).then(() => {
      throw new Error('Execution error')
    }).catch((err) => {
      try {
        err.message.should.be.exactly(errMsg)
        solved.should.be.exactly(2)
        done()
      } catch (err) {
        done(err)
      }
    })
  })
})