tests/pools/cluster/fixed.test.js

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