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Saturate overflowing values when adjusting time marks

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KT-46132
This commit is contained in:
Ilya Gorbunov
2022-02-20 08:31:09 +03:00
committed by Space
parent f32e0f3cba
commit 77cf41c189
7 changed files with 194 additions and 14 deletions
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libraries/stdlib/test/time/TimeMarkTest.kt
+75
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@@ -59,6 +59,53 @@ class TimeMarkTest {
}
fun testAdjustmentInfinite(timeSource: TimeSource) {
val baseMark = timeSource.markNow()
val infiniteFutureMark = baseMark + Duration.INFINITE
val infinitePastMark = baseMark - Duration.INFINITE
assertEquals(-Duration.INFINITE, infiniteFutureMark.elapsedNow())
assertTrue(infiniteFutureMark.hasNotPassedNow())
assertEquals(Duration.INFINITE, infinitePastMark.elapsedNow())
assertTrue(infinitePastMark.hasPassedNow())
assertFailsWith<IllegalArgumentException> { infiniteFutureMark - Duration.INFINITE }
assertFailsWith<IllegalArgumentException> { infinitePastMark + Duration.INFINITE }
val longDuration = Long.MAX_VALUE.nanoseconds
val long2Duration = longDuration * 2
val pastMark = baseMark - longDuration
val futureMark = pastMark + long2Duration
val sameMark = futureMark - longDuration
val elapsedDiff = sameMark.elapsedNow() - baseMark.elapsedNow()
assertTrue(elapsedDiff < 1.milliseconds, "$elapsedDiff")
}
@Test
fun adjustmentInfinite() {
testAdjustmentInfinite(TestTimeSource())
}
fun testLongDisplacement(timeSource: TimeSource, wait: (Duration) -> Unit) {
val baseMark = timeSource.markNow()
val longDuration = Long.MAX_VALUE.nanoseconds
val waitDuration = 10.milliseconds
val pastMark = baseMark - longDuration
wait(waitDuration)
val elapsed = pastMark.elapsedNow()
assertTrue(elapsed > longDuration)
assertTrue(elapsed >= longDuration + waitDuration)
}
@Test
fun longDisplacement() {
val timeSource = TestTimeSource()
testLongDisplacement(timeSource, { waitDuration -> timeSource += waitDuration })
}
@Test
fun defaultTimeMarkAdjustment() {
val baseMark = TimeSource.Monotonic.markNow()
@@ -77,4 +124,32 @@ class TimeMarkTest {
assertTrue(elapsedBefore >= elapsedBase + 200.microseconds)
assertTrue(elapsedAfter <= elapsedBase - 100.microseconds)
}
@Test
fun defaultTimeMarkAdjustmentInfinite() {
testAdjustmentInfinite(TimeSource.Monotonic)
// do the same with specialized methods
val baseMark = TimeSource.Monotonic.markNow()
val infiniteFutureMark = baseMark + Duration.INFINITE
val infinitePastMark = baseMark - Duration.INFINITE
assertEquals(-Duration.INFINITE, infiniteFutureMark.elapsedNow())
assertTrue(infiniteFutureMark.hasNotPassedNow())
assertEquals(Duration.INFINITE, infinitePastMark.elapsedNow())
assertTrue(infinitePastMark.hasPassedNow())
assertFailsWith<IllegalArgumentException> { infiniteFutureMark - Duration.INFINITE }
assertFailsWith<IllegalArgumentException> { infinitePastMark + Duration.INFINITE }
val longDuration = Long.MAX_VALUE.nanoseconds
val long2Duration = longDuration * 2
val pastMark = baseMark - longDuration
val futureMark = pastMark + long2Duration
val sameMark = futureMark - longDuration
val elapsedDiff = sameMark.elapsedNow() - baseMark.elapsedNow()
assertTrue(elapsedDiff < 1.milliseconds, "$elapsedDiff")
}
}