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TakeTest.kt
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TakeTest.kt
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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 kotlin.test.*
class TakeTest : TestBase() {
@Test
fun testTake() = runTest {
val flow = flow {
emit(1)
emit(2)
}
assertEquals(3, flow.take(2).sum())
assertEquals(3, flow.take(Int.MAX_VALUE).sum())
assertEquals(1, flow.take(1).single())
assertEquals(2, flow.drop(1).take(1).single())
}
@Test
fun testIllegalArgument() {
assertFailsWith<IllegalArgumentException> { flowOf(1).take(0) }
assertFailsWith<IllegalArgumentException> { flowOf(1).take(-1) }
}
@Test
fun testTakeSuspending() = runTest {
val flow = flow {
emit(1)
yield()
emit(2)
yield()
}
assertEquals(3, flow.take(2).sum())
assertEquals(3, flow.take(Int.MAX_VALUE).sum())
assertEquals(1, flow.take(1).single())
assertEquals(2, flow.drop(1).take(1).single())
}
@Test
fun testEmptyFlow() = runTest {
val sum = emptyFlow<Int>().take(10).sum()
assertEquals(0, sum)
}
@Test
fun testNonPositiveValues() {
val flow = flowOf(1)
assertFailsWith<IllegalArgumentException> {
flow.take(-1)
}
assertFailsWith<IllegalArgumentException> {
flow.take(0)
}
}
@Test
fun testCancelUpstream() = runTest {
var cancelled = false
val flow = flow {
coroutineScope {
launch(start = CoroutineStart.ATOMIC) {
hang { cancelled = true }
}
emit(1)
}
}
assertEquals(1, flow.take(1).single())
assertTrue(cancelled)
}
@Test
fun testErrorCancelsUpstream() = runTest {
var cancelled = false
val flow = flow {
coroutineScope {
launch(start = CoroutineStart.ATOMIC) {
hang { cancelled = true }
}
emit(1)
}
}.take(2)
.map<Int, Int> {
throw TestException()
}.catch { emit(42) }
assertEquals(42, flow.single())
assertTrue(cancelled)
}
@Test
fun takeWithRetries() = runTest {
val flow = flow {
expect(1)
emit(1)
expect(2)
emit(2)
while (true) {
emit(42)
expectUnreached()
}
}.retry(2) {
expectUnreached()
true
}.take(2)
val sum = flow.sum()
assertEquals(3, sum)
finish(3)
}
@Test
fun testNonIdempotentRetry() = runTest {
var count = 0
flow { while (true) emit(1) }
.retry { count++ % 2 != 0 }
.take(1)
.collect {
expect(1)
}
finish(2)
}
@Test
fun testNestedTake() = runTest {
val inner = flow {
emit(1)
expectUnreached()
}.take(1)
val outer = flow {
while(true) {
emitAll(inner)
}
}
assertEquals(listOf(1, 1, 1), outer.take(3).toList())
}
}