| /* |
| * Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. |
| */ |
| |
| package kotlinx.coroutines.experimental.selects |
| |
| import kotlinx.coroutines.experimental.* |
| import kotlin.coroutines.experimental.* |
| import kotlin.test.* |
| |
| class SelectBiasTest : TestBase() { |
| val n = 10_000 |
| |
| @Test |
| fun testBiased() = runTest { |
| val d0 = async(coroutineContext) { 0 } |
| val d1 = async(coroutineContext) { 1 } |
| val counter = IntArray(2) |
| repeat(n) { |
| val selected = select<Int> { |
| d0.onAwait { 0 } |
| d1.onAwait { 1 } |
| } |
| counter[selected]++ |
| } |
| assertEquals(n, counter[0]) |
| assertEquals(0, counter[1]) |
| } |
| |
| @Test |
| fun testUnbiased() = runTest { |
| val d0 = async(coroutineContext) { 0 } |
| val d1 = async(coroutineContext) { 1 } |
| val counter = IntArray(2) |
| repeat(n) { |
| val selected = selectUnbiased<Int> { |
| d0.onAwait { 0 } |
| d1.onAwait { 1 } |
| } |
| counter[selected]++ |
| } |
| assertTrue(counter[0] >= n / 4) |
| assertTrue(counter[1] >= n / 4) |
| } |
| } |