tests/pools/cluster/fixed.test.js

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