Add an integration test for coroutine debugger java agent

Author: dkhalanskyjb

integration-testing/README.md

@@ -9,5 +9,6 @@ The tests are the following:
   `-PdryRun` affects `npmPublish` so that it only provides a packed publication
   and does not in fact attempt to send the build for publication.
 * `MavenPublicationValidator` depends on the published artifacts and tests artifacts binary content and absence of atomicfu in the classpath
+* `DebugAgentTest` checks that the coroutine debugger can be run as a Java agent.
 
 All the available tests can be run with `integration-testing:test`.

integration-testing/build.gradle

@@ -20,6 +20,11 @@ sourceSets {
         compileClasspath += sourceSets.test.runtimeClasspath
         runtimeClasspath += sourceSets.test.runtimeClasspath
     }
+    debugAgentTest {
+        kotlin
+        compileClasspath += sourceSets.test.runtimeClasspath
+        runtimeClasspath += sourceSets.test.runtimeClasspath
+    }
 }
 
 task npmTest(type: Test) {
@@ -49,17 +54,27 @@ task mavenTest(type: Test) {
             project.dependencies.create("org.jetbrains.kotlinx:kotlinx-coroutines-android:$version"))
 }
 
+task debugAgentTest(type: Test) {
+    def sourceSet = sourceSets.debugAgentTest
+    dependsOn(project(':kotlinx-coroutines-debug').shadowJar)
+    jvmArgs ('-javaagent:' + project(':kotlinx-coroutines-debug').shadowJar.outputs.files.getFiles()[0])
+    testClassesDirs = sourceSet.output.classesDirs
+    classpath = sourceSet.runtimeClasspath
+}
+
 dependencies {
     testCompile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
     testCompile 'junit:junit:4.12'
     npmTestCompile 'org.apache.commons:commons-compress:1.18'
     npmTestCompile 'com.google.code.gson:gson:2.8.5'
+    debugAgentTestCompile project(':kotlinx-coroutines-core')
+    debugAgentTestCompile project(':kotlinx-coroutines-debug')
 }
 
 compileTestKotlin {
     kotlinOptions.jvmTarget = "1.8"
 }
 
 test {
-    dependsOn([npmTest, mavenTest])
+    dependsOn([npmTest, mavenTest, debugAgentTest])
 }

integration-testing/src/debugAgentTest/kotlin/DebugAgentTest.kt

@@ -0,0 +1,20 @@
+/*
+ *  Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+import org.junit.*
+import kotlinx.coroutines.*
+import kotlinx.coroutines.debug.*
+import java.io.*
+
+class DebugAgentTest {
+
+    @Test
+    fun agentDumpsCoroutines() = runBlocking {
+        val baos = ByteArrayOutputStream()
+        DebugProbes.dumpCoroutines(PrintStream(baos))
+        // if the agent works, then dumps should contain something,
+        // at least the fact that this test is running.
+        Assert.assertTrue(baos.toString().contains("agentDumpsCoroutines"))
+    }
+
+}