pubsub.test.js

/* eslint-env mocha */
'use strict'

import { createClient } from './pubsub.js'

const should = require('should') // eslint-disable-line

const client = createClient('ws://localhost:8080', {
  manual: true,
  reconnectOnDisconnection: false,
  reconnectOnOnline: false,
  reconnectOnTimeout: false
})
const {
  maxReconnectionDelay,
  minReconnectionDelay
} = client.options

const createRandomDelays = (number) => {
  return [...new Array(number)].map((_, i) => {
    client.failedConnectionAttempts = i
    return client.getNextRandomDelay()
  })
}
const delays1 = createRandomDelays(10)
const delays2 = createRandomDelays(10)

describe('Test getNextRandomDelay()', function () {
  it('every delay should be longer than the previous one', function () {
    // In other words, the delays should be sorted in ascending numerical order.
    should(delays1).deepEqual([...delays1].sort((a, b) => a - b))
    should(delays2).deepEqual([...delays2].sort((a, b) => a - b))
  })

  it('no delay should be shorter than the minimal reconnection delay', function () {
    delays1.forEach((delay) => {
      should(delay).be.greaterThanOrEqual(minReconnectionDelay)
    })
    delays2.forEach((delay) => {
      should(delay).be.greaterThanOrEqual(minReconnectionDelay)
    })
  })

  it('no delay should be longer than the maximal reconnection delay', function () {
    delays1.forEach((delay) => {
      should(delay).be.lessThanOrEqual(maxReconnectionDelay)
    })
    delays2.forEach((delay) => {
      should(delay).be.lessThanOrEqual(maxReconnectionDelay)
    })
  })
})