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Advance TestTimeSource more precisely

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Change durations in its test so that they hold precise number
of nanoseconds
This commit is contained in:
Ilya Gorbunov
2021-03-27 21:36:57 +03:00
parent fa7460ba48
commit 4fd2254f3f
2 changed files with 12 additions and 12 deletions
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libraries/stdlib/test/time/TestTimeSourceTest.kt
+9 -9
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@@ -18,9 +18,9 @@ class TestTimeSourceTest {
assertFailsWith<IllegalStateException>((-enormousDuration).toString()) { TestTimeSource() += -enormousDuration }
}
val moderatePositiveDuration = Duration.nanoseconds(Long.MAX_VALUE.takeHighestOneBit())
val borderlinePositiveDuration = Duration.nanoseconds(Long.MAX_VALUE) // rounded to 2.0^63, which is slightly more than Long.MAX_VALUE
val borderlineNegativeDuration = Duration.nanoseconds(Long.MIN_VALUE)
val moderatePositiveDuration = Duration.nanoseconds(Long.MAX_VALUE) / 1.5
val borderlineQuarterPositiveDuration = Duration.nanoseconds(Long.MAX_VALUE / 4) // precise number of ns
val borderlineQuarterNegativeDuration = Duration.nanoseconds(Long.MIN_VALUE / 4)
run {
val timeSource = TestTimeSource()
timeSource += moderatePositiveDuration
@@ -28,20 +28,20 @@ class TestTimeSourceTest {
}
run {
val timeSource = TestTimeSource()
timeSource += borderlinePositiveDuration
assertFailsWith<IllegalStateException>("Should overflow positive") { timeSource += Duration.nanoseconds(1) }
repeat(4) { timeSource += borderlineQuarterPositiveDuration }
assertFailsWith<IllegalStateException>("Should overflow positive") { timeSource += Duration.nanoseconds(4) }
}
run {
val timeSource = TestTimeSource()
timeSource += borderlineNegativeDuration
assertFailsWith<IllegalStateException>("Should overflow negative") { timeSource += -Duration.nanoseconds(1) }
repeat(4) { timeSource += borderlineQuarterNegativeDuration }
assertFailsWith<IllegalStateException>("Should overflow negative") { timeSource += -Duration.nanoseconds(4) }
}
run {
val timeSource = TestTimeSource()
timeSource += moderatePositiveDuration
// does not overflow event if duration doesn't fit in long
timeSource += -moderatePositiveDuration + borderlineNegativeDuration
// does not overflow even if duration doesn't fit in long, but the result fits
timeSource += -moderatePositiveDuration - Duration.nanoseconds(Long.MAX_VALUE)
}
}