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Fixes #1094
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68 changes: 68 additions & 0 deletions
68
kotlinx-coroutines-core/common/test/flow/operators/ScanTest.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| /* | ||
| * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. | ||
| */ | ||
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| package kotlinx.coroutines.flow | ||
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| import kotlinx.coroutines.* | ||
| import kotlinx.coroutines.channels.* | ||
| import kotlin.test.* | ||
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| class ScanTest : TestBase() { | ||
| @Test | ||
| fun testScan() = runTest { | ||
| val flow = flowOf(1, 2, 3, 4, 5) | ||
| val result = flow.scan { acc, v -> acc + v }.toList() | ||
| assertEquals(listOf(1, 3, 6, 10, 15), result) | ||
| } | ||
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| @Test | ||
| fun testScanWithInitial() = runTest { | ||
| val flow = flowOf(1, 2, 3) | ||
| val result = flow.scan(::emptyList) { acc: List<Int>, value -> acc + value }.toList() | ||
| assertEquals(listOf(emptyList(), listOf(1), listOf(1, 2), listOf(1, 2, 3)), result) | ||
| } | ||
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| @Test | ||
| fun testNulls() = runTest { | ||
| val flow = flowOf(null, 2, null, null, null, 5) | ||
| val result = flow.scan { acc, v -> if (v == null) acc else (if (acc == null) v else acc + v) }.toList() | ||
| assertEquals(listOf(null, 2, 2, 2, 2, 7), result) | ||
| } | ||
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| @Test | ||
| fun testEmptyFlow() = runTest { | ||
| val result = emptyFlow<Int>().scan { _, _ -> 1 }.toList() | ||
| assertTrue(result.isEmpty()) | ||
| } | ||
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| @Test | ||
| fun testErrorCancelsUpstream() = runTest { | ||
| expect(1) | ||
| val latch = Channel<Unit>() | ||
| val flow = flow { | ||
| coroutineScope { | ||
| launch { | ||
| latch.send(Unit) | ||
| hang { expect(3) } | ||
| } | ||
| emit(1) | ||
| emit(2) | ||
| } | ||
| }.scan { _, value -> | ||
| expect(value) // 2 | ||
| latch.receive() | ||
| throw TestException() | ||
| }.onErrorCollect(emptyFlow()) | ||
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| assertEquals(1, flow.single()) | ||
| finish(4) | ||
| } | ||
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| public operator fun <T> Collection<T>.plus(element: T): List<T> { | ||
| val result = ArrayList<T>(size + 1) | ||
| result.addAll(this) | ||
| result.add(element) | ||
| return result | ||
| } | ||
| } |