Vsevolod Tolstopyatov | d57bfa2 | 2019-04-04 14:25:13 +0300 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. |
| 3 | */ |
| 4 | |
| 5 | package kotlinx.coroutines.flow |
| 6 | |
| 7 | import kotlinx.coroutines.* |
| 8 | import kotlin.test.* |
| 9 | |
| 10 | class ConcatenateTest : TestBase() { |
| 11 | @Test |
| 12 | fun testConcatenate() = runTest { |
| 13 | val n = 100 |
| 14 | val sum = (1..n).asFlow() |
| 15 | .map { value -> |
| 16 | flow { |
| 17 | repeat(value) { |
| 18 | emit(it + 1) |
| 19 | } |
| 20 | } |
| 21 | }.concatenate().sum() |
| 22 | assertEquals(n * (n + 1) * (n + 2) / 6, sum) |
| 23 | } |
| 24 | |
| 25 | @Test |
| 26 | fun testSingle() = runTest { |
| 27 | val flows = flow { |
| 28 | repeat(100) { |
| 29 | if (it == 99) emit(flowOf(42)) |
| 30 | else emit(flowOf()) |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | val value = flows.concatenate().single() |
| 35 | assertEquals(42, value) |
| 36 | } |
| 37 | |
| 38 | |
| 39 | @Test |
| 40 | fun testContext() = runTest { |
| 41 | val flow = flow { |
| 42 | emit(flow { |
| 43 | expect(2) |
| 44 | assertEquals("first", NamedDispatchers.name()) |
| 45 | emit(1) |
| 46 | }.flowOn(NamedDispatchers("first"))) |
| 47 | |
| 48 | emit(flow { |
| 49 | expect(3) |
| 50 | assertEquals("second", NamedDispatchers.name()) |
| 51 | emit(1) |
| 52 | }.flowOn(NamedDispatchers("second"))) |
| 53 | }.concatenate().flowOn(NamedDispatchers("first")) |
| 54 | |
| 55 | expect(1) |
| 56 | assertEquals(2, flow.sum()) |
| 57 | finish(4) |
| 58 | } |
| 59 | } |