| /* |
| * Copyright 2016-2017 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the 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) |
| } |
| } |