KT-82901: Fix issue with converting Long.MIN_VALUE to Duration

- Fix Duration unit conversion overflow handling for milliseconds and add boundary clamping
- Add boundary value tests for Long-to-Duration conversions

^KT-82901 Fixed

Merge-request: KT-MR-24754
Merged-by: Dmitry Nekrasov <dmitry.nekrasov@jetbrains.com>
(cherry picked from commit ab1a3c3)

Author: DmitryNekrasov

libraries/stdlib/src/kotlin/time/Duration.kt

@@ -977,7 +977,12 @@ public fun Long.toDuration(unit: DurationUnit): Duration {
     val maxNsInUnit = convertDurationUnitOverflow(MAX_NANOS, DurationUnit.NANOSECONDS, unit)
     return when {
         this in -maxNsInUnit..maxNsInUnit -> durationOfNanos(convertDurationUnitOverflow(this, unit, DurationUnit.NANOSECONDS))
-        unit >= DurationUnit.MILLISECONDS -> durationOfMillis(this.sign * convertDurationUnitToMilliseconds(abs(this), unit))
+        unit >= DurationUnit.MILLISECONDS -> durationOfMillis(
+            this.sign * convertDurationUnitToMilliseconds(
+                abs(this.coerceAtLeast(Long.MIN_VALUE + 1)),
+                unit
+            )
+        )
         else -> durationOfMillis(convertDurationUnit(this, unit, DurationUnit.MILLISECONDS).coerceIn(-MAX_MILLIS, MAX_MILLIS))
     }
 }

libraries/stdlib/test/time/DurationTest.kt

@@ -75,6 +75,30 @@ class DurationTest {
         assertFailsWith<IllegalArgumentException> { Double.NaN.toDuration(DurationUnit.SECONDS) }
     }
 
+    @Test
+    fun longBoundaryValuesDurationConversion() {
+        val testCases = listOf(
+            Long.MIN_VALUE to Duration.NEG_INFINITE,
+            Long.MAX_VALUE to Duration.INFINITE
+        )
+
+        for ((value, expectedInfinite) in testCases) {
+            assertEquals(expectedInfinite, value.days)
+            assertEquals(expectedInfinite, value.hours)
+            assertEquals(expectedInfinite, value.minutes)
+            assertEquals(expectedInfinite, value.seconds)
+            assertEquals(expectedInfinite, value.milliseconds)
+        }
+
+        val usDuration = 106751991.days + 4.hours + 54.seconds + 775.milliseconds
+        assertEquals(-usDuration, Long.MIN_VALUE.microseconds)
+        assertEquals(usDuration, Long.MAX_VALUE.microseconds)
+
+        val nsDuration = 106751.days + 23.hours + 47.minutes + 16.seconds + 854.milliseconds
+        assertEquals(-nsDuration, Long.MIN_VALUE.nanoseconds)
+        assertEquals(nsDuration, Long.MAX_VALUE.nanoseconds)
+    }
+
     @Test
     fun equality() {
         val data = listOf<Pair<Double, DurationUnit>>(