feat: add median task run time statistic

[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 c55b971edb8a9ed3e47ccae1db4b0deff206b08b..5a7394a57aa5fe5abdf643a43d6bfcf48d35f67a 100644 (file)
--- a/tests/pools/selection-strategies/selection-strategies.test.js
+++ b/tests/pools/selection-strategies/selection-strategies.test.js
@@ -12,7 +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'
@@ -42,7 +43,9 @@ describe('Selection strategies test suite', () => {
       WorkerChoiceStrategies.ROUND_ROBIN
     )
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy().nextWorkerId
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      ).nextWorkerId
     ).toBe(0)
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -69,8 +72,13 @@ 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)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
     ).toBe(false)
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -80,8 +88,13 @@ 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)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
     ).toBe(false)
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -133,14 +146,14 @@ describe('Selection strategies test suite', () => {
     )
     let results = new Set()
     for (let i = 0; i < max; i++) {
-      results.add(pool.chooseWorker().id)
+      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().threadId)
+      results.add(pool.chooseWorker()[1].threadId)
     }
     expect(results.size).toBe(max)
     await pool.destroy()
@@ -153,11 +166,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN }
     )
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy().nextWorkerId
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      ).nextWorkerId
+    ).toBeDefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.ROUND_ROBIN)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy().nextWorkerId
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      ).nextWorkerId
     ).toBe(0)
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -167,53 +184,60 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN }
     )
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerChoiceStrategy.nextWorkerId
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.ROUND_ROBIN
+      ).nextWorkerId
+    ).toBeDefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.ROUND_ROBIN)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerChoiceStrategy.nextWorkerId
+      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_RECENTLY_USED strategy is taken at pool creation', async () => {
+  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.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(false)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
+    ).toBe(false)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
     ).toBe(false)
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -221,22 +245,27 @@ 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.getWorkerChoiceStrategy()
-        .requiredStatistics.runTime
+      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
+    ).toBe(false)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
+    ).toBe(false)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
     ).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())
@@ -246,14 +275,108 @@ 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)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
+    ).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)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
+    ).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())
@@ -272,18 +395,18 @@ describe('Selection strategies test suite', () => {
     expect(pool.opts.workerChoiceStrategy).toBe(
       WorkerChoiceStrategies.FAIR_SHARE
     )
-    for (const worker of pool.workerChoiceStrategyContext
-      .getWorkerChoiceStrategy()
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.FAIR_SHARE)
       .workerLastVirtualTaskTimestamp.keys()) {
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .workerLastVirtualTaskTimestamp.get(worker).start
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).start
       ).toBe(0)
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .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
@@ -310,9 +433,14 @@ 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)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
+    ).toBe(false)
     await pool.destroy()
     pool = new DynamicThreadPool(
       min,
@@ -321,9 +449,14 @@ 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)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
+    ).toBe(false)
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -340,6 +473,11 @@ 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()
   })
@@ -353,10 +491,18 @@ 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()
   })
@@ -367,22 +513,23 @@ describe('Selection strategies test suite', () => {
       './tests/worker-files/thread/testWorker.js'
     )
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerLastVirtualTaskTimestamp
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.FAIR_SHARE
+      ).workerLastVirtualTaskTimestamp
+    ).toBeDefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.FAIR_SHARE)
-    for (const worker of pool.workerChoiceStrategyContext
-      .getWorkerChoiceStrategy()
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.FAIR_SHARE)
       .workerLastVirtualTaskTimestamp.keys()) {
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .workerLastVirtualTaskTimestamp.get(worker).start
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).start
       ).toBe(0)
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .workerLastVirtualTaskTimestamp.get(worker).end
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).end
       ).toBe(0)
     }
     await pool.destroy()
@@ -392,22 +539,23 @@ describe('Selection strategies test suite', () => {
       './tests/worker-files/thread/testWorker.js'
     )
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerChoiceStrategy.workerLastVirtualTaskTimestamp
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.FAIR_SHARE
+      ).workerLastVirtualTaskTimestamp
+    ).toBeDefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.FAIR_SHARE)
-    for (const worker of pool.workerChoiceStrategyContext
-      .getWorkerChoiceStrategy()
-      .workerChoiceStrategy.workerLastVirtualTaskTimestamp.keys()) {
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.FAIR_SHARE)
+      .workerLastVirtualTaskTimestamp.keys()) {
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .workerChoiceStrategy.workerLastVirtualTaskTimestamp.get(worker).start
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.FAIR_SHARE)
+          .workerLastVirtualTaskTimestamp.get(workerKey).start
       ).toBe(0)
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .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
@@ -424,24 +572,27 @@ describe('Selection strategies test suite', () => {
       WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
     )
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy().currentWorkerId
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).currentWorkerId
     ).toBe(0)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .defaultWorkerWeight
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight
     ).toBeGreaterThan(0)
-    for (const worker of pool.workerChoiceStrategyContext
-      .getWorkerChoiceStrategy()
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
       .workersTaskRunTime.keys()) {
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .workersTaskRunTime.get(worker).weight
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+          .workersTaskRunTime.get(workerKey).weight
       ).toBeGreaterThan(0)
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .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
@@ -468,9 +619,14 @@ 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)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
+    ).toBe(false)
     await pool.destroy()
     pool = new DynamicThreadPool(
       min,
@@ -479,9 +635,14 @@ 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)
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
+    ).toBe(false)
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -498,6 +659,11 @@ 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()
   })
@@ -511,10 +677,21 @@ 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 * 50
+    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()
   })
@@ -525,31 +702,38 @@ describe('Selection strategies test suite', () => {
       './tests/worker-files/thread/testWorker.js'
     )
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy().currentWorkerId
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).currentWorkerId
+    ).toBeDefined()
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .defaultWorkerWeight
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight
+    ).toBeDefined()
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workersTaskRunTime
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).workersTaskRunTime
+    ).toBeDefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy().currentWorkerId
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).currentWorkerId
     ).toBe(0)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .defaultWorkerWeight
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight
     ).toBeGreaterThan(0)
-    for (const worker of pool.workerChoiceStrategyContext
-      .getWorkerChoiceStrategy()
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
       .workersTaskRunTime.keys()) {
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .workersTaskRunTime.get(worker).runTime
+        pool.workerChoiceStrategyContext.workerChoiceStrategies
+          .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+          .workersTaskRunTime.get(workerKey).runTime
       ).toBe(0)
     }
     await pool.destroy()
@@ -559,33 +743,38 @@ describe('Selection strategies test suite', () => {
       './tests/worker-files/thread/testWorker.js'
     )
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerChoiceStrategy.currentWorkerId
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).currentWorkerId
+    ).toBeDefined()
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerChoiceStrategy.defaultWorkerWeight
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight
+    ).toBeDefined()
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerChoiceStrategy.workersTaskRunTime
-    ).toBeUndefined()
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).workersTaskRunTime
+    ).toBeDefined()
     pool.setWorkerChoiceStrategy(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerChoiceStrategy.currentWorkerId
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).currentWorkerId
     ).toBe(0)
     expect(
-      pool.workerChoiceStrategyContext.getWorkerChoiceStrategy()
-        .workerChoiceStrategy.defaultWorkerWeight
+      pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
+        WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
+      ).defaultWorkerWeight
     ).toBeGreaterThan(0)
-    for (const worker of pool.workerChoiceStrategyContext
-      .getWorkerChoiceStrategy()
-      .workerChoiceStrategy.workersTaskRunTime.keys()) {
+    for (const workerKey of pool.workerChoiceStrategyContext.workerChoiceStrategies
+      .get(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN)
+      .workersTaskRunTime.keys()) {
       expect(
-        pool.workerChoiceStrategyContext
-          .getWorkerChoiceStrategy()
-          .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
@@ -602,7 +791,7 @@ describe('Selection strategies test suite', () => {
           { workerChoiceStrategy: 'UNKNOWN_STRATEGY' }
         )
     ).toThrowError(
-      new Error("Worker choice strategy 'UNKNOWN_STRATEGY' not found")
+      new Error("Invalid worker choice strategy 'UNKNOWN_STRATEGY'")
     )
   })
 })