Testing resolution of kotlinx coroutines delay

DelayTest.kt

import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import kotlin.time.measureTime

suspend fun main() {
  suspend fun delayLoop(delayMillis: Long, delayCount: Int) {
    var totalDelay: Long = 0
    var maxDelay: Long = 0
    repeat(delayCount) {
      measureTime {
        delay(delayMillis)
      }.also {
        val uSecs = it.inWholeMicroseconds
        totalDelay += uSecs
        if (uSecs > maxDelay) maxDelay = uSecs
      }
    }
    println("Expected delay $delayMillis milliseconds, average=${totalDelay / delayCount} us, max: $maxDelay us")
  }

  coroutineScope {
    launch {
      delayLoop(5, 1000)
    }
    launch {
      delayLoop(15, 1000)
    }
    launch {
      delayLoop(50, 1000)
    }
    launch {
      delayLoop(500, 100)
    }
  }
}

/*
output on Linux 6.5.5 + JDK 17 + Kotlin 1.9.0 + coroutines 1.6.4

Expected delay 5 milliseconds, average=5172 us, max: 6948 us
Expected delay 15 milliseconds, average=15179 us, max: 16478 us
Expected delay 500 milliseconds, average=500219 us, max: 501024 us
Expected delay 50 milliseconds, average=50224 us, max: 51301 us
*/