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/*
* Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.flow
import kotlinx.coroutines.*
import kotlinx.coroutines.channels.*
import kotlin.test.*
class DebounceTest : TestBase() {
@Test
public fun testBasic() = withVirtualTime {
expect(1)
val flow = flow {
expect(3)
emit("A")
delay(1500)
emit("B")
delay(500)
emit("C")
delay(250)
emit("D")
delay(2000)
emit("E")
expect(4)
}
expect(2)
val result = flow.debounce(1000).toList()
assertEquals(listOf("A", "D", "E"), result)
finish(5)
}
@Test
fun testSingleNull() = runTest {
val flow = flowOf<Int?>(null).debounce(Long.MAX_VALUE)
assertNull(flow.single())
}
@Test
fun testBasicWithNulls() = withVirtualTime {
expect(1)
val flow = flow {
expect(3)
emit("A")
delay(1500)
emit("B")
delay(500)
emit("C")
delay(250)
emit(null)
delay(2000)
emit(null)
expect(4)
}
expect(2)
val result = flow.debounce(1000).toList()
assertEquals(listOf("A", null, null), result)
finish(5)
}
@Test
fun testEmpty() = runTest {
val flow = emptyFlow<Int>().debounce(Long.MAX_VALUE)
assertNull(flow.singleOrNull())
}
@Test
fun testScalar() = withVirtualTime {
val flow = flowOf(1, 2, 3).debounce(1000)
assertEquals(3, flow.single())
finish(1)
}
@Test
fun testPace() = withVirtualTime {
val flow = flow {
expect(1)
repeat(10) {
emit(-it)
delay(99)
}
repeat(10) {
emit(it)
delay(101)
}
expect(2)
}.debounce(100)
assertEquals((0..9).toList(), flow.toList())
finish(3)
}
@Test
fun testUpstreamError()= testUpstreamError(TimeoutCancellationException(""))
@Test
fun testUpstreamErrorCancellation() = testUpstreamError(TimeoutCancellationException(""))
private inline fun <reified T: Throwable> testUpstreamError(cause: T) = runTest {
val latch = Channel<Unit>()
val flow = flow {
expect(1)
emit(1)
expect(2)
latch.receive()
throw cause
}.debounce(1).map {
latch.send(Unit)
hang { expect(3) }
}
assertFailsWith<T>(flow)
finish(4)
}
@Test
fun testUpstreamErrorIsolatedContext() = runTest {
val latch = Channel<Unit>()
val flow = flow {
assertEquals("upstream", NamedDispatchers.name())
expect(1)
emit(1)
expect(2)
latch.receive()
throw TestException()
}.flowOn(NamedDispatchers("upstream")).debounce(1).map {
latch.send(Unit)
hang { expect(3) }
}
assertFailsWith<TestException>(flow)
finish(4)
}
@Test
fun testUpstreamErrorDebounceNotTriggered() = runTest {
val flow = flow {
expect(1)
emit(1)
expect(2)
throw TestException()
}.debounce(Long.MAX_VALUE).map {
expectUnreached()
}
assertFailsWith<TestException>(flow)
finish(3)
}
@Test
fun testUpstreamErrorDebounceNotTriggeredInIsolatedContext() = runTest {
val flow = flow {
expect(1)
emit(1)
expect(2)
throw TestException()
}.flowOn(NamedDispatchers("source")).debounce(Long.MAX_VALUE).map {
expectUnreached()
}
assertFailsWith<TestException>(flow)
finish(3)
}
@Test
fun testDownstreamError() = runTest {
val flow = flow {
expect(1)
emit(1)
hang { expect(3) }
}.debounce(100).map {
expect(2)
yield()
throw TestException()
it
}
assertFailsWith<TestException>(flow)
finish(4)
}
@Test
fun testDownstreamErrorIsolatedContext() = runTest {
val flow = flow {
assertEquals("upstream", NamedDispatchers.name())
expect(1)
emit(1)
hang { expect(3) }
}.flowOn(NamedDispatchers("upstream")).debounce(100).map {
expect(2)
yield()
throw TestException()
it
}
assertFailsWith<TestException>(flow)
finish(4)
}
}
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