1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
* Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.jdk9
import kotlinx.coroutines.*
import kotlinx.coroutines.exceptions.*
import org.junit.Test
import kotlinx.coroutines.flow.flowOn
import org.junit.runner.*
import org.junit.runners.*
import kotlin.contracts.*
import java.util.concurrent.Flow as JFlow
import kotlin.coroutines.*
import kotlin.test.*
@RunWith(Parameterized::class)
class IntegrationTest(
private val ctx: Ctx,
private val delay: Boolean
) : TestBase() {
enum class Ctx {
MAIN { override fun invoke(context: CoroutineContext): CoroutineContext = context.minusKey(Job) },
DEFAULT { override fun invoke(context: CoroutineContext): CoroutineContext = Dispatchers.Default },
UNCONFINED { override fun invoke(context: CoroutineContext): CoroutineContext = Dispatchers.Unconfined };
abstract operator fun invoke(context: CoroutineContext): CoroutineContext
}
companion object {
@Parameterized.Parameters(name = "ctx={0}, delay={1}")
@JvmStatic
fun params(): Collection<Array<Any>> = Ctx.values().flatMap { ctx ->
listOf(false, true).map { delay ->
arrayOf(ctx, delay)
}
}
}
@Test
fun testEmpty(): Unit = runBlocking {
val pub = flowPublish<String>(ctx(coroutineContext)) {
if (delay) delay(1)
// does not send anything
}
assertFailsWith<NoSuchElementException> { pub.awaitFirst() }
assertEquals("OK", pub.awaitFirstOrDefault("OK"))
assertNull(pub.awaitFirstOrNull())
assertEquals("ELSE", pub.awaitFirstOrElse { "ELSE" })
assertFailsWith<NoSuchElementException> { pub.awaitLast() }
assertFailsWith<NoSuchElementException> { pub.awaitSingle() }
var cnt = 0
pub.collect { cnt++ }
assertEquals(0, cnt)
}
@Test
fun testSingle() = runBlocking {
val pub = flowPublish(ctx(coroutineContext)) {
if (delay) delay(1)
send("OK")
}
assertEquals("OK", pub.awaitFirst())
assertEquals("OK", pub.awaitFirstOrDefault("!"))
assertEquals("OK", pub.awaitFirstOrNull())
assertEquals("OK", pub.awaitFirstOrElse { "ELSE" })
assertEquals("OK", pub.awaitLast())
assertEquals("OK", pub.awaitSingle())
var cnt = 0
pub.collect {
assertEquals("OK", it)
cnt++
}
assertEquals(1, cnt)
}
@Test
fun testNumbers() = runBlocking {
val n = 100 * stressTestMultiplier
val pub = flowPublish(ctx(coroutineContext)) {
for (i in 1..n) {
send(i)
if (delay) delay(1)
}
}
assertEquals(1, pub.awaitFirst())
assertEquals(1, pub.awaitFirstOrDefault(0))
assertEquals(n, pub.awaitLast())
assertEquals(1, pub.awaitFirstOrNull())
assertEquals(1, pub.awaitFirstOrElse { 0 })
assertFailsWith<IllegalArgumentException> { pub.awaitSingle() }
checkNumbers(n, pub)
val flow = pub.asFlow()
checkNumbers(n, flow.flowOn(ctx(coroutineContext)).asPublisher())
}
@Test
fun testCancelWithoutValue() = runTest {
val job = launch(Job(), start = CoroutineStart.UNDISPATCHED) {
flowPublish<String> {
hang {}
}.awaitFirst()
}
job.cancel()
job.join()
}
@Test
fun testEmptySingle() = runTest(unhandled = listOf { e -> e is NoSuchElementException}) {
expect(1)
val job = launch(Job(), start = CoroutineStart.UNDISPATCHED) {
flowPublish<String> {
yield()
expect(2)
// Nothing to emit
}.awaitFirst()
}
job.join()
finish(3)
}
private suspend fun checkNumbers(n: Int, pub: JFlow.Publisher<Int>) {
var last = 0
pub.collect {
assertEquals(++last, it)
}
assertEquals(n, last)
}
}
@OptIn(ExperimentalContracts::class)
internal suspend inline fun <reified E: Throwable> assertCallsExceptionHandlerWith(
crossinline operation: suspend (CoroutineExceptionHandler) -> Unit): E {
contract {
callsInPlace(operation, InvocationKind.EXACTLY_ONCE)
}
val handler = CapturingHandler()
return withContext(handler) {
operation(handler)
handler.getException().let {
assertTrue(it is E, it.toString())
it
}
}
}
|
