tests/pools/thread/fixed.test.js

   1 const { expect } = require('expect')
   2 const { FixedThreadPool } = require('../../../lib/index')
   3 const WorkerFunctions = require('../../test-types')
   4 const TestUtils = require('../../test-utils')
   5 const numberOfThreads = 10
   6 const pool = new FixedThreadPool(
   7   numberOfThreads,
   8   './tests/worker-files/thread/testWorker.js',
   9   {
  10     errorHandler: e => console.error(e)
  11   }
  12 )
  13 const emptyPool = new FixedThreadPool(
  14   1,
  15   './tests/worker-files/thread/emptyWorker.js',
  16   { exitHandler: () => console.log('empty pool worker exited') }
  17 )
  18 const echoPool = new FixedThreadPool(
  19   1,
  20   './tests/worker-files/thread/echoWorker.js'
  21 )
  22 const errorPool = new FixedThreadPool(
  23   1,
  24   './tests/worker-files/thread/errorWorker.js',
  25   {
  26     errorHandler: e => console.error(e)
  27   }
  28 )
  29 const asyncErrorPool = new FixedThreadPool(
  30   1,
  31   './tests/worker-files/thread/asyncErrorWorker.js',
  32   {
  33     errorHandler: e => console.error(e)
  34   }
  35 )
  36 const asyncPool = new FixedThreadPool(
  37   1,
  38   './tests/worker-files/thread/asyncWorker.js'
  39 )
  40
  41 describe('Fixed thread pool test suite', () => {
  42   after('Destroy all pools', async () => {
  43     // We need to clean up the resources after our test
  44     await echoPool.destroy()
  45     await asyncPool.destroy()
  46     await errorPool.destroy()
  47     await asyncErrorPool.destroy()
  48     await emptyPool.destroy()
  49   })
  50
  51   it('Choose worker round robin test', async () => {
  52     const results = new Set()
  53     for (let i = 0; i < numberOfThreads; i++) {
  54       results.add(pool.chooseWorker().threadId)
  55     }
  56     expect(results.size).toBe(numberOfThreads)
  57   })
  58
  59   it('Verify that the function is executed in a worker thread', async () => {
  60     let result = await pool.execute({
  61       function: WorkerFunctions.fibonacci
  62     })
  63     expect(result).toBe(false)
  64     result = await pool.execute({
  65       function: WorkerFunctions.factorial
  66     })
  67     expect(result).toBe(false)
  68   })
  69
  70   it('Verify that is possible to invoke the execute method without input', async () => {
  71     const result = await pool.execute()
  72     expect(result).toBe(false)
  73   })
  74
  75   it('Verify that busy event is emitted', async () => {
  76     const promises = []
  77     let poolBusy = 0
  78     pool.emitter.on('busy', () => poolBusy++)
  79     for (let i = 0; i < numberOfThreads * 2; i++) {
  80       promises.push(pool.execute())
  81     }
  82     // The `busy` event is triggered when the number of submitted tasks at once reach the number of fixed pool workers.
  83     // So in total numberOfThreads + 1 times for a loop submitting up to numberOfThreads * 2 tasks to the fixed pool.
  84     expect(poolBusy).toBe(numberOfThreads + 1)
  85   })
  86
  87   it('Verify that is possible to have a worker that return undefined', async () => {
  88     const result = await emptyPool.execute()
  89     expect(result).toBeUndefined()
  90   })
  91
  92   it('Verify that data are sent to the worker correctly', async () => {
  93     const data = { f: 10 }
  94     const result = await echoPool.execute(data)
  95     expect(result).toEqual(data)
  96   })
  97
  98   it('Verify that error handling is working properly:sync', async () => {
  99     const data = { f: 10 }
 100     let inError
 101     try {
 102       await errorPool.execute(data)
 103     } catch (e) {
 104       inError = e
 105     }
 106     expect(inError).toBeDefined()
 107     expect(inError).toBeInstanceOf(Error)
 108     expect(inError.message).toBeDefined()
 109     expect(typeof inError.message === 'string').toBe(true)
 110     expect(inError.message).toBe('Error Message from ThreadWorker')
 111   })
 112
 113   it('Verify that error handling is working properly:async', async () => {
 114     const data = { f: 10 }
 115     let inError
 116     try {
 117       await asyncErrorPool.execute(data)
 118     } catch (e) {
 119       inError = e
 120     }
 121     expect(inError).toBeDefined()
 122     expect(inError).toBeInstanceOf(Error)
 123     expect(inError.message).toBeDefined()
 124     expect(typeof inError.message === 'string').toBe(true)
 125     expect(inError.message).toBe('Error Message from ThreadWorker:async')
 126   })
 127
 128   it('Verify that async function is working properly', async () => {
 129     const data = { f: 10 }
 130     const startTime = new Date().getTime()
 131     const result = await asyncPool.execute(data)
 132     const usedTime = new Date().getTime() - startTime
 133     expect(result).toEqual(data)
 134     expect(usedTime).toBeGreaterThanOrEqual(2000)
 135   })
 136
 137   it('Shutdown test', async () => {
 138     const exitPromise = TestUtils.waitExits(pool, numberOfThreads)
 139     await pool.destroy()
 140     const numberOfExitEvents = await exitPromise
 141     expect(numberOfExitEvents).toBe(numberOfThreads)
 142   })
 143
 144   it('Should work even without opts in input', async () => {
 145     const pool1 = new FixedThreadPool(
 146       1,
 147       './tests/worker-files/thread/testWorker.js'
 148     )
 149     const res = await pool1.execute()
 150     expect(res).toBe(false)
 151     // We need to clean up the resources after our test
 152     await pool1.destroy()
 153   })
 154
 155   it('Verify that a pool with zero worker fails', async () => {
 156     expect(
 157       () => new FixedThreadPool(0, './tests/worker-files/thread/testWorker.js')
 158     ).toThrowError(new Error('Cannot instantiate a fixed pool with no worker'))
 159   })
 160 })