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     expect(poolBusy).toBe(numberOfWorkers)
  78   })
  79
  80   it('Verify that is possible to have a worker that return undefined', async () => {
  81     const result = await emptyPool.execute()
  82     expect(result).toBeFalsy()
  83   })
  84
  85   it('Verify that data are sent to the worker correctly', async () => {
  86     const data = { f: 10 }
  87     const result = await echoPool.execute(data)
  88     expect(result).toBeTruthy()
  89     expect(result.f).toBe(data.f)
  90   })
  91
  92   it('Verify that error handling is working properly:sync', async () => {
  93     const data = { f: 10 }
  94     let inError
  95     try {
  96       await errorPool.execute(data)
  97     } catch (e) {
  98       inError = e
  99     }
 100     expect(inError).toBeDefined()
 101     expect(typeof inError === 'string').toBe(true)
 102     expect(inError).toBe('Error Message from ClusterWorker')
 103   })
 104
 105   it('Verify that error handling is working properly:async', async () => {
 106     const data = { f: 10 }
 107     let inError
 108     try {
 109       await asyncErrorPool.execute(data)
 110     } catch (e) {
 111       inError = e
 112     }
 113     expect(inError).toBeDefined()
 114     expect(typeof inError === 'string').toBe(true)
 115     expect(inError).toBe('Error Message from ClusterWorker:async')
 116   })
 117
 118   it('Verify that async function is working properly', async () => {
 119     const data = { f: 10 }
 120     const startTime = new Date().getTime()
 121     const result = await asyncPool.execute(data)
 122     const usedTime = new Date().getTime() - startTime
 123     expect(result).toBeTruthy()
 124     expect(result.f).toBe(data.f)
 125     expect(usedTime).toBeGreaterThanOrEqual(2000)
 126   })
 127
 128   it('Shutdown test', async () => {
 129     const exitPromise = TestUtils.waitExits(pool, numberOfWorkers)
 130     await pool.destroy()
 131     const res = await exitPromise
 132     expect(res).toBe(numberOfWorkers)
 133   })
 134
 135   it('Should work even without opts in input', async () => {
 136     const pool1 = new FixedClusterPool(
 137       1,
 138       './tests/worker-files/cluster/testWorker.js'
 139     )
 140     const res = await pool1.execute({ test: 'test' })
 141     expect(res).toBeFalsy()
 142     // We need to clean up the resources after our test
 143     await pool1.destroy()
 144   })
 145
 146   it('Verify that a pool with zero worker fails', async () => {
 147     expect(
 148       () =>
 149         new FixedClusterPool(0, './tests/worker-files/cluster/testWorker.js')
 150     ).toThrowError(new Error('Cannot instantiate a fixed pool with no worker'))
 151   })
 152 })