Merge branch 'master' into interleaved-weighted-round-robin-worker-choice-strategy

[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 ea5fc04a69dd2c1fe6cf8b124c22b63fd2af3638..352eb7f636e30788ce90c80d4e6d98c1255ded77 100644 (file)
--- a/tests/pools/selection-strategies/selection-strategies.test.js
+++ b/tests/pools/selection-strategies/selection-strategies.test.js
@@ -5,6 +5,7 @@ const {
   FixedThreadPool,
   FixedClusterPool
 } = require('../../../lib')
+const { CircularArray } = require('../../../lib/circular-array')
 
 describe('Selection strategies test suite', () => {
   const min = 0
@@ -121,14 +122,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: false,
+      avgRunTime: false,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     await pool.destroy()
     pool = new DynamicThreadPool(
       min,
@@ -137,14 +139,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: false,
+      avgRunTime: false,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -156,9 +159,26 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.ROUND_ROBIN }
     )
     // TODO: Create a better test to cover `RoundRobinWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
+    }
+    await Promise.all(promises)
+    for (const workerNode of pool.workerNodes) {
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: maxMultiplier,
+        running: 0,
+        runTime: 0,
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: 0,
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
     }
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -172,9 +192,26 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.ROUND_ROBIN }
     )
     // TODO: Create a better test to cover `RoundRobinWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
+    }
+    await Promise.all(promises)
+    for (const workerNode of pool.workerNodes) {
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: maxMultiplier,
+        running: 0,
+        runTime: 0,
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: 0,
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
     }
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -254,14 +291,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: false,
+      avgRunTime: false,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     await pool.destroy()
     pool = new DynamicThreadPool(
       min,
@@ -270,14 +308,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: false,
+      avgRunTime: false,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -289,9 +328,26 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.LEAST_USED }
     )
     // TODO: Create a better test to cover `LeastUsedWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
+    }
+    await Promise.all(promises)
+    for (const workerNode of pool.workerNodes) {
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: maxMultiplier,
+        running: 0,
+        runTime: 0,
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: 0,
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
     }
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -305,9 +361,26 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.LEAST_USED }
     )
     // TODO: Create a better test to cover `LeastUsedWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
+    }
+    await Promise.all(promises)
+    for (const workerNode of pool.workerNodes) {
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: maxMultiplier,
+        running: 0,
+        runTime: 0,
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: 0,
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
     }
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -321,14 +394,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: true,
+      avgRunTime: false,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     await pool.destroy()
     pool = new DynamicThreadPool(
       min,
@@ -337,14 +411,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(false)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: true,
+      avgRunTime: false,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -356,9 +431,29 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.LEAST_BUSY }
     )
     // TODO: Create a better test to cover `LeastBusyWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
+    }
+    await Promise.all(promises)
+    for (const workerNode of pool.workerNodes) {
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: expect.any(Number),
+        running: 0,
+        runTime: expect.any(Number),
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: 0,
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
+      expect(workerNode.tasksUsage.run).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.run).toBeLessThanOrEqual(max * maxMultiplier)
+      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
     }
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -372,9 +467,29 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.LEAST_BUSY }
     )
     // TODO: Create a better test to cover `LeastBusyWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
+    }
+    await Promise.all(promises)
+    for (const workerNode of pool.workerNodes) {
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: expect.any(Number),
+        running: 0,
+        runTime: expect.any(Number),
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: 0,
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
+      expect(workerNode.tasksUsage.run).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.run).toBeLessThanOrEqual(max * maxMultiplier)
+      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
     }
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -388,14 +503,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: true,
+      avgRunTime: true,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     await pool.destroy()
     pool = new DynamicThreadPool(
       min,
@@ -404,14 +520,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: true,
+      avgRunTime: true,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -423,15 +540,28 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.FAIR_SHARE }
     )
     // TODO: Create a better test to cover `FairShareChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
     }
+    await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage.avgRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThanOrEqual(0)
-      expect(workerNode.tasksUsage.medRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.medRunTime).toBe(0)
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: maxMultiplier,
+        running: 0,
+        runTime: expect.any(Number),
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: expect.any(Number),
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
+      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -450,15 +580,28 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.FAIR_SHARE }
     )
     // TODO: Create a better test to cover `FairShareChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
     }
+    await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage.avgRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThanOrEqual(0)
-      expect(workerNode.tasksUsage.medRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.medRunTime).toBe(0)
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: maxMultiplier,
+        running: 0,
+        runTime: expect.any(Number),
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: expect.any(Number),
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
+      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -482,15 +625,28 @@ describe('Selection strategies test suite', () => {
       }
     )
     // TODO: Create a better test to cover `FairShareChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
     }
+    await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage.avgRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.avgRunTime).toBe(0)
-      expect(workerNode.tasksUsage.medRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.medRunTime).toBeGreaterThanOrEqual(0)
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: maxMultiplier,
+        running: 0,
+        runTime: expect.any(Number),
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: 0,
+        medRunTime: expect.any(Number),
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
+      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.medRunTime).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -583,14 +739,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: true,
+      avgRunTime: true,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     await pool.destroy()
     pool = new DynamicThreadPool(
       min,
@@ -599,14 +756,15 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().runTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime
-    ).toBe(true)
-    expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics().medRunTime
-    ).toBe(false)
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: true,
+      avgRunTime: true,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
     // We need to clean up the resources after our test
     await pool.destroy()
   })
@@ -618,15 +776,30 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN }
     )
     // TODO: Create a better test to cover `WeightedRoundRobinWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
     }
+    await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage.avgRunTime).toBeDefined()
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: expect.any(Number),
+        running: 0,
+        runTime: expect.any(Number),
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: expect.any(Number),
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
+      expect(workerNode.tasksUsage.run).toBeGreaterThanOrEqual(0)
+      expect(workerNode.tasksUsage.run).toBeLessThanOrEqual(max * maxMultiplier)
+      expect(workerNode.tasksUsage.runTime).toBeGreaterThanOrEqual(0)
       expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThanOrEqual(0)
-      expect(workerNode.tasksUsage.medRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.medRunTime).toBe(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -650,15 +823,30 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy: WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN }
     )
     // TODO: Create a better test to cover `WeightedRoundRobinWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
     }
+    await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage.avgRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThanOrEqual(0)
-      expect(workerNode.tasksUsage.medRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.medRunTime).toBe(0)
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: expect.any(Number),
+        running: 0,
+        runTime: expect.any(Number),
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: expect.any(Number),
+        medRunTime: 0,
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
+      expect(workerNode.tasksUsage.run).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.run).toBeLessThanOrEqual(max * maxMultiplier)
+      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -687,15 +875,30 @@ describe('Selection strategies test suite', () => {
       }
     )
     // TODO: Create a better test to cover `WeightedRoundRobinWorkerChoiceStrategy#choose`
+    const promises = new Set()
     const maxMultiplier = 2
     for (let i = 0; i < max * maxMultiplier; i++) {
-      await pool.execute()
+      promises.add(pool.execute())
     }
+    await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage.avgRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.avgRunTime).toBe(0)
-      expect(workerNode.tasksUsage.medRunTime).toBeDefined()
-      expect(workerNode.tasksUsage.medRunTime).toBeGreaterThanOrEqual(0)
+      expect(workerNode.tasksUsage).toStrictEqual({
+        run: expect.any(Number),
+        running: 0,
+        runTime: expect.any(Number),
+        runTimeHistory: expect.any(CircularArray),
+        avgRunTime: 0,
+        medRunTime: expect.any(Number),
+        waitTime: 0,
+        waitTimeHistory: expect.any(CircularArray),
+        avgWaitTime: 0,
+        medWaitTime: 0,
+        error: 0
+      })
+      expect(workerNode.tasksUsage.run).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.run).toBeLessThanOrEqual(max * maxMultiplier)
+      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
+      expect(workerNode.tasksUsage.medRunTime).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -789,6 +992,45 @@ describe('Selection strategies test suite', () => {
     await pool.destroy()
   })
 
+  it('Verify INTERLEAVED_WEIGHTED_ROUND_ROBIN strategy default tasks usage statistics requirements', async () => {
+    const workerChoiceStrategy =
+      WorkerChoiceStrategies.INTERLEAVED_WEIGHTED_ROUND_ROBIN
+    let pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy }
+    )
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: false,
+      avgRunTime: false,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
+    await pool.destroy()
+    pool = new DynamicThreadPool(
+      min,
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy }
+    )
+    expect(
+      pool.workerChoiceStrategyContext.getRequiredStatistics()
+    ).toStrictEqual({
+      runTime: false,
+      avgRunTime: false,
+      medRunTime: false,
+      waitTime: false,
+      avgWaitTime: false,
+      medWaitTime: false
+    })
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
   it('Verify unknown strategy throw error', () => {
     expect(
       () =>