Update lincheck to 2.4 and re-write the corresponding tests

Author: ndkoval

build.gradle

@@ -95,7 +95,7 @@ allprojects {
         kotlin_version = rootProject.properties['kotlin_snapshot_version']
     }
 
-    if (build_snapshot_train || atomicfu_version.endsWith("-SNAPSHOT")) {
+    if (build_snapshot_train || atomicfu_version.endsWith("-SNAPSHOT") || lincheck_version.endsWith("-SNAPSHOT")) {
         repositories {
             mavenLocal()
             maven { url "https://oss.sonatype.org/content/repositories/snapshots" }

gradle.properties

@@ -11,7 +11,7 @@ kotlin_version=1.3.50
 junit_version=4.12
 atomicfu_version=0.13.2
 html_version=0.6.8
-lincheck_version=2.0
+lincheck_version=2.4
 dokka_version=0.9.16-rdev-2-mpp-hacks
 byte_buddy_version=1.9.3
 reactor_vesion=3.2.5.RELEASE

kotlinx-coroutines-core/build.gradle

@@ -48,7 +48,7 @@ configurations {
 
 kotlin.sourceSets {
     jvmTest.dependencies {
-        api "com.devexperts.lincheck:lincheck:$lincheck_version"
+        api "org.jetbrains.kotlinx:lincheck:$lincheck_version"
         api "com.esotericsoftware:kryo:4.0.0"
         implementation project (":android-unit-tests")
     }

kotlinx-coroutines-core/common/test/channels/TestChannelKind.kt

@@ -7,45 +7,26 @@ package kotlinx.coroutines.channels
 import kotlinx.coroutines.*
 import kotlinx.coroutines.selects.*
 
-enum class TestChannelKind {
-    RENDEZVOUS {
-        override fun create(): Channel<Int> = Channel(Channel.RENDEZVOUS)
-        override fun toString(): String = "RendezvousChannel"
-    },
-    ARRAY_1 {
-        override fun create(): Channel<Int> = Channel(1)
-        override fun toString(): String = "ArrayChannel(1)"
-    },
-    ARRAY_10 {
-        override fun create(): Channel<Int> = Channel(10)
-        override fun toString(): String = "ArrayChannel(10)"
-    },
-    LINKED_LIST {
-        override fun create(): Channel<Int> = Channel(Channel.UNLIMITED)
-        override fun toString(): String = "LinkedListChannel"
-    },
-    CONFLATED {
-        override fun create(): Channel<Int> = Channel(Channel.CONFLATED)
-        override fun toString(): String = "ConflatedChannel"
-        override val isConflated: Boolean get() = true
-    },
-    ARRAY_BROADCAST_1 {
-        override fun create(): Channel<Int> = ChannelViaBroadcast(BroadcastChannel(1))
-        override fun toString(): String = "ArrayBroadcastChannel(1)"
-    },
-    ARRAY_BROADCAST_10 {
-        override fun create(): Channel<Int> = ChannelViaBroadcast(BroadcastChannel(10))
-        override fun toString(): String = "ArrayBroadcastChannel(10)"
-    },
-    CONFLATED_BROADCAST {
-        override fun create(): Channel<Int> = ChannelViaBroadcast(ConflatedBroadcastChannel<Int>())
-        override fun toString(): String = "ConflatedBroadcastChannel"
-        override val isConflated: Boolean get() = true
-    }
+enum class TestChannelKind(val capacity: Int,
+                           private val description: String,
+                           private val viaBroadcast: Boolean = false
+) {
+    RENDEZVOUS(0, "RendezvousChannel"),
+    ARRAY_1(1, "ArrayChannel(1)"),
+    ARRAY_2(2, "ArrayChannel(2)"),
+    ARRAY_10(10, "ArrayChannel(10)"),
+    LINKED_LIST(Channel.UNLIMITED, "LinkedListChannel"),
+    CONFLATED(Channel.CONFLATED, "ConflatedChannel"),
+    ARRAY_1_BROADCAST(1, "ArrayBroadcastChannel(1)", viaBroadcast = true),
+    ARRAY_10_BROADCAST(10, "ArrayBroadcastChannel(10)", viaBroadcast = true),
+    CONFLATED_BROADCAST(Channel.CONFLATED, "ConflatedBroadcastChannel", viaBroadcast = true)
     ;
 
-    abstract fun create(): Channel<Int>
-    open val isConflated: Boolean get() = false
+    fun create(): Channel<Int> = if (viaBroadcast) ChannelViaBroadcast(BroadcastChannel(capacity))
+                                 else Channel(capacity)
+
+    val isConflated get() = capacity == Channel.CONFLATED
+    override fun toString(): String = description
 }
 
 private class ChannelViaBroadcast<E>(

kotlinx-coroutines-core/jvm/test/LCStressOptionsDefault.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+package kotlinx.coroutines
+
+import org.jetbrains.kotlinx.lincheck.*
+import org.jetbrains.kotlinx.lincheck.strategy.stress.*
+import kotlin.reflect.*
+
+class LCStressOptionsDefault : StressOptions() {
+    init {
+        iterations(100 * stressTestMultiplierSqrt)
+        invocationsPerIteration(1000 * stressTestMultiplierSqrt)
+        actorsBefore(if (isStressTest) 3 else 0)
+        threads(3)
+        actorsPerThread(if (isStressTest) 3 else 2)
+    }
+}
+
+fun Options<*,*>.check(testClass: KClass<*>) = LinChecker.check(testClass.java, this)