feat: cache in a map worker choice strategy to allow conditionnal reuse

[poolifier.git] / tests / pools / selection-strategies / selection-strategies.test.js

diff --git a/tests/pools/selection-strategies/selection-strategies.test.js b/tests/pools/selection-strategies/selection-strategies.test.js
index 7b11bf402e06f981d53dda669809808dbb3c9ca8..254f02de7870e5c8da73ab6c260fa954a176283c 100644 (file)
--- a/tests/pools/selection-strategies/selection-strategies.test.js
+++ b/tests/pools/selection-strategies/selection-strategies.test.js
@@ -2,7 +2,8 @@ const { expect } = require('expect')
 const {
   WorkerChoiceStrategies,
   DynamicThreadPool,
-  FixedThreadPool
+  FixedThreadPool,
+  FixedClusterPool
 } = require('../../../lib/index')
 
 describe('Selection strategies test suite', () => {
@@ -11,7 +12,8 @@ describe('Selection strategies test suite', () => {
 
   it('Verify that WorkerChoiceStrategies enumeration provides string values', () => {
     expect(WorkerChoiceStrategies.ROUND_ROBIN).toBe('ROUND_ROBIN')
-    expect(WorkerChoiceStrategies.LESS_RECENTLY_USED).toBe('LESS_RECENTLY_USED')
+    expect(WorkerChoiceStrategies.LESS_USED).toBe('LESS_USED')
+    expect(WorkerChoiceStrategies.LESS_BUSY).toBe('LESS_BUSY')
     expect(WorkerChoiceStrategies.FAIR_SHARE).toBe('FAIR_SHARE')
     expect(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN).toBe(
       'WEIGHTED_ROUND_ROBIN'
@@ -31,6 +33,24 @@ describe('Selection strategies test suite', () => {
     await pool.destroy()
   })
 
+  it('Verify ROUND_ROBIN strategy is taken at pool creation', async () => {
+    const pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy: WorkerChoiceStrategies.ROUND_ROBIN }
+    )
+    expect(pool.opts.workerChoiceStrategy).toBe(
+      WorkerChoiceStrategies.ROUND_ROBIN
+    )
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      ).nextWorkerId
+    ).toBe(0)
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
   it('Verify ROUND_ROBIN strategy can be set after pool creation', async () => {
     const pool = new DynamicThreadPool(
       min,
@@ -52,8 +72,10 @@ describe('Selection strategies test suite', () => {
     )
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.ROUND_ROBIN)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(false)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
     ).toBe(false)
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -63,8 +85,10 @@ describe('Selection strategies test suite', () => {
     )
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.ROUND_ROBIN)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(false)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
     ).toBe(false)
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -109,41 +133,102 @@ describe('Selection strategies test suite', () => {
     await pool.destroy()
   })
 
-  it('Verify LESS_RECENTLY_USED strategy is taken at pool creation', async () => {
+  it('Verify ROUND_ROBIN strategy runtime behavior', async () => {
+    let pool = new FixedClusterPool(
+      max,
+      './tests/worker-files/cluster/testWorker.js'
+    )
+    let results = new Set()
+    for (let i = 0; i < max; i++) {
+      results.add(pool.chooseWorker()[1].id)
+    }
+    expect(results.size).toBe(max)
+    await pool.destroy()
+    pool = new FixedThreadPool(max, './tests/worker-files/thread/testWorker.js')
+    results = new Set()
+    for (let i = 0; i < max; i++) {
+      results.add(pool.chooseWorker()[1].threadId)
+    }
+    expect(results.size).toBe(max)
+    await pool.destroy()
+  })
+
+  it('Verify ROUND_ROBIN strategy internals are resets after setting it', async () => {
+    let pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy: WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN }
+    )
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      )?.nextWorkerId
+    ).toBeUndefined()
+    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.ROUND_ROBIN)
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      ).nextWorkerId
+    ).toBe(0)
+    await pool.destroy()
+    pool = new DynamicThreadPool(
+      min,
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy: WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN }
+    )
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      )?.nextWorkerId
+    ).toBeUndefined()
+    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.ROUND_ROBIN)
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      ).nextWorkerId
+    ).toBe(0)
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LESS_USED strategy is taken at pool creation', async () => {
     const pool = new FixedThreadPool(
       max,
       './tests/worker-files/thread/testWorker.js',
-      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_RECENTLY_USED }
+      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_USED }
     )
     expect(pool.opts.workerChoiceStrategy).toBe(
-      WorkerChoiceStrategies.LESS_RECENTLY_USED
+      WorkerChoiceStrategies.LESS_USED
     )
     // We need to clean up the resources after our test
     await pool.destroy()
   })
 
-  it('Verify LESS_RECENTLY_USED strategy can be set after pool creation', async () => {
+  it('Verify LESS_USED strategy can be set after pool creation', async () => {
     const pool = new FixedThreadPool(
       max,
       './tests/worker-files/thread/testWorker.js'
     )
-    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_RECENTLY_USED)
+    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_USED)
     expect(pool.opts.workerChoiceStrategy).toBe(
-      WorkerChoiceStrategies.LESS_RECENTLY_USED
+      WorkerChoiceStrategies.LESS_USED
     )
     // We need to clean up the resources after our test
     await pool.destroy()
   })
 
-  it('Verify LESS_RECENTLY_USED strategy default tasks usage statistics requirements', async () => {
+  it('Verify LESS_USED strategy default tasks usage statistics requirements', async () => {
     let pool = new FixedThreadPool(
       max,
       './tests/worker-files/thread/testWorker.js'
     )
-    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_RECENTLY_USED)
+    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_USED)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(false)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
     ).toBe(false)
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -151,22 +236,24 @@ describe('Selection strategies test suite', () => {
       max,
       './tests/worker-files/thread/testWorker.js'
     )
-    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_RECENTLY_USED)
+    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_USED)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(false)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
     ).toBe(false)
     // We need to clean up the resources after our test
     await pool.destroy()
   })
 
-  it('Verify LESS_RECENTLY_USED strategy can be run in a fixed pool', async () => {
+  it('Verify LESS_USED strategy can be run in a fixed pool', async () => {
     const pool = new FixedThreadPool(
       max,
       './tests/worker-files/thread/testWorker.js',
-      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_RECENTLY_USED }
+      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_USED }
     )
-    // TODO: Create a better test to cover `LessRecentlyUsedWorkerChoiceStrategy#choose`
+    // TODO: Create a better test to cover `LessUsedWorkerChoiceStrategy#choose`
     const promises = []
     for (let i = 0; i < max * 2; i++) {
       promises.push(pool.execute())
@@ -176,14 +263,102 @@ describe('Selection strategies test suite', () => {
     await pool.destroy()
   })
 
-  it('Verify LESS_RECENTLY_USED strategy can be run in a dynamic pool', async () => {
+  it('Verify LESS_USED strategy can be run in a dynamic pool', async () => {
     const pool = new DynamicThreadPool(
       min,
       max,
       './tests/worker-files/thread/testWorker.js',
-      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_RECENTLY_USED }
+      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_USED }
     )
-    // TODO: Create a better test to cover `LessRecentlyUsedWorkerChoiceStrategy#choose`
+    // TODO: Create a better test to cover `LessUsedWorkerChoiceStrategy#choose`
+    const promises = []
+    for (let i = 0; i < max * 2; i++) {
+      promises.push(pool.execute())
+    }
+    await Promise.all(promises)
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LESS_BUSY strategy is taken at pool creation', async () => {
+    const pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_BUSY }
+    )
+    expect(pool.opts.workerChoiceStrategy).toBe(
+      WorkerChoiceStrategies.LESS_BUSY
+    )
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LESS_BUSY strategy can be set after pool creation', async () => {
+    const pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js'
+    )
+    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_BUSY)
+    expect(pool.opts.workerChoiceStrategy).toBe(
+      WorkerChoiceStrategies.LESS_BUSY
+    )
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LESS_BUSY strategy default tasks usage statistics requirements', async () => {
+    let pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js'
+    )
+    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_BUSY)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(true)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
+    ).toBe(false)
+    await pool.destroy()
+    pool = new DynamicThreadPool(
+      min,
+      max,
+      './tests/worker-files/thread/testWorker.js'
+    )
+    pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.LESS_BUSY)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(true)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
+    ).toBe(false)
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LESS_BUSY strategy can be run in a fixed pool', async () => {
+    const pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_BUSY }
+    )
+    // TODO: Create a better test to cover `LessBusyWorkerChoiceStrategy#choose`
+    const promises = []
+    for (let i = 0; i < max * 2; i++) {
+      promises.push(pool.execute())
+    }
+    await Promise.all(promises)
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LESS_BUSY strategy can be run in a dynamic pool', async () => {
+    const pool = new DynamicThreadPool(
+      min,
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy: WorkerChoiceStrategies.LESS_BUSY }
+    )
+    // TODO: Create a better test to cover `LessBusyWorkerChoiceStrategy#choose`
     const promises = []
     for (let i = 0; i < max * 2; i++) {
       promises.push(pool.execute())
@@ -202,6 +377,20 @@ describe('Selection strategies test suite', () => {
     expect(pool.opts.workerChoiceStrategy).toBe(
       WorkerChoiceStrategies.FAIR_SHARE
     )
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.FAIR_SHARE)
+      .workerLastVirtualTaskTimestamp.keys()) {
+      expect(
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).start
+      ).toBe(0)
+      expect(
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).end
+      ).toBe(0)
+    }
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -226,8 +415,10 @@ describe('Selection strategies test suite', () => {
     )
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.FAIR_SHARE)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(true)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
     ).toBe(true)
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -237,8 +428,10 @@ describe('Selection strategies test suite', () => {
     )
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.FAIR_SHARE)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(true)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
     ).toBe(true)
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -256,6 +449,11 @@ describe('Selection strategies test suite', () => {
       promises.push(pool.execute())
     }
     await Promise.all(promises)
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.FAIR_SHARE
+      ).workerLastVirtualTaskTimestamp.size
+    ).toBe(pool.workers.length)
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -269,34 +467,45 @@ describe('Selection strategies test suite', () => {
     )
     // TODO: Create a better test to cover `FairShareChoiceStrategy#choose`
     const promises = []
-    for (let i = 0; i < max * 2; i++) {
+    const maxMultiplier = 2
+    for (let i = 0; i < max * maxMultiplier; i++) {
       promises.push(pool.execute())
     }
     await Promise.all(promises)
+    // if (process.platform !== 'win32') {
+    //   expect(
+    //     pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+    //       WorkerChoiceStrategies.FAIR_SHARE
+    //     ).workerLastVirtualTaskTimestamp.size
+    //   ).toBe(pool.workers.length)
+    // }
     // We need to clean up the resources after our test
     await pool.destroy()
   })
 
-  it('Verify FAIR_SHARE strategy statistics are resets after setting it', async () => {
+  it('Verify FAIR_SHARE strategy internals are resets after setting it', async () => {
     let pool = new FixedThreadPool(
       max,
       './tests/worker-files/thread/testWorker.js'
     )
     expect(
-      pool.workerChoiceStrategyContext.workerChoiceStrategy
-        .workerLastVirtualTaskTimestamp
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.FAIR_SHARE
+      )?.workerLastVirtualTaskTimestamp
     ).toBeUndefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.FAIR_SHARE)
-    for (const worker of pool.workerChoiceStrategyContext.workerChoiceStrategy.workerLastVirtualTaskTimestamp.keys()) {
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.FAIR_SHARE)
+      .workerLastVirtualTaskTimestamp.keys()) {
       expect(
-        pool.workerChoiceStrategyContext.workerChoiceStrategy.workerLastVirtualTaskTimestamp.get(
-          worker
-        ).start
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).start
       ).toBe(0)
       expect(
-        pool.workerChoiceStrategyContext.workerChoiceStrategy.workerLastVirtualTaskTimestamp.get(
-          worker
-        ).end
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).end
       ).toBe(0)
     }
     await pool.destroy()
@@ -306,20 +515,23 @@ describe('Selection strategies test suite', () => {
       './tests/worker-files/thread/testWorker.js'
     )
     expect(
-      pool.workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy
-        .workerLastVirtualTaskTimestamp
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.FAIR_SHARE
+      )?.workerLastVirtualTaskTimestamp
     ).toBeUndefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.FAIR_SHARE)
-    for (const worker of pool.workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy.workerLastVirtualTaskTimestamp.keys()) {
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.FAIR_SHARE)
+      .workerLastVirtualTaskTimestamp.keys()) {
       expect(
-        pool.workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy.workerLastVirtualTaskTimestamp.get(
-          worker
-        ).start
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).start
       ).toBe(0)
       expect(
-        pool.workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy.workerLastVirtualTaskTimestamp.get(
-          worker
-        ).end
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).end
       ).toBe(0)
     }
     // We need to clean up the resources after our test
@@ -335,6 +547,30 @@ describe('Selection strategies test suite', () => {
     expect(pool.opts.workerChoiceStrategy).toBe(
       WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
     )
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).currentWorkerId
+    ).toBe(0)
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight
+    ).toBeGreaterThan(0)
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+      .workersTaskRunTime.keys()) {
+      expect(
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+          .workersTaskRunTime.get(workerKey).weight
+      ).toBeGreaterThan(0)
+      expect(
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+          .workersTaskRunTime.get(workerKey).runTime
+      ).toBe(0)
+    }
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -359,8 +595,10 @@ describe('Selection strategies test suite', () => {
     )
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(true)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
     ).toBe(true)
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -370,8 +608,10 @@ describe('Selection strategies test suite', () => {
     )
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(true)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
     ).toBe(true)
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -389,6 +629,11 @@ describe('Selection strategies test suite', () => {
       promises.push(pool.execute())
     }
     await Promise.all(promises)
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).workersTaskRunTime.size
+    ).toBe(pool.workers.length)
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -402,28 +647,63 @@ describe('Selection strategies test suite', () => {
     )
     // TODO: Create a better test to cover `WeightedRoundRobinWorkerChoiceStrategy#choose`
     const promises = []
-    for (let i = 0; i < max * 2; i++) {
+    const maxMultiplier =
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight * 2
+    for (let i = 0; i < max * maxMultiplier; i++) {
       promises.push(pool.execute())
     }
     await Promise.all(promises)
+    if (process.platform !== 'win32') {
+      expect(
+        pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+          WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+        ).workersTaskRunTime.size
+      ).toBe(pool.workers.length)
+    }
     // We need to clean up the resources after our test
     await pool.destroy()
   })
 
-  it('Verify WEIGHTED_ROUND_ROBIN strategy statistics are resets after setting it', async () => {
+  it('Verify WEIGHTED_ROUND_ROBIN strategy internals are resets after setting it', async () => {
     let pool = new FixedThreadPool(
       max,
       './tests/worker-files/thread/testWorker.js'
     )
     expect(
-      pool.workerChoiceStrategyContext.workerChoiceStrategy.workersTaskRunTime
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      )?.currentWorkerId
+    ).toBeUndefined()
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      )?.defaultWorkerWeight
+    ).toBeUndefined()
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      )?.workersTaskRunTime
     ).toBeUndefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
-    for (const worker of pool.workerChoiceStrategyContext.workerChoiceStrategy.workersTaskRunTime.keys()) {
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).currentWorkerId
+    ).toBe(0)
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight
+    ).toBeGreaterThan(0)
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+      .workersTaskRunTime.keys()) {
       expect(
-        pool.workerChoiceStrategyContext.workerChoiceStrategy.workersTaskRunTime.get(
-          worker
-        ).runTime
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+          .workersTaskRunTime.get(workerKey).runTime
       ).toBe(0)
     }
     await pool.destroy()
@@ -433,15 +713,38 @@ describe('Selection strategies test suite', () => {
       './tests/worker-files/thread/testWorker.js'
     )
     expect(
-      pool.workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy
-        .workersTaskRunTime
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      )?.currentWorkerId
+    ).toBeUndefined()
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      )?.defaultWorkerWeight
+    ).toBeUndefined()
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      )?.workersTaskRunTime
     ).toBeUndefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
-    for (const worker of pool.workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy.workersTaskRunTime.keys()) {
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).currentWorkerId
+    ).toBe(0)
+    expect(
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight
+    ).toBeGreaterThan(0)
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+      .workersTaskRunTime.keys()) {
       expect(
-        pool.workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy.workersTaskRunTime.get(
-          worker
-        ).runTime
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+          .workersTaskRunTime.get(workerKey).runTime
       ).toBe(0)
     }
     // We need to clean up the resources after our test