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 * SPDX-License-Identifier: Apache-2.0
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 *   Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *   Licensed under the Apache License, Version 2.0 (the "License").
 *   You may not use this file except in compliance with the License.
 *   A copy of the License is located at
 *       http://www.apache.org/licenses/LICENSE-2.0
 *   or in the "license" file accompanying this file. This file 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.
 * OpenSearch Plugin build tools don't work with the Gradle Jacoco Plugin to report coverage out of the box.
 * https://github.com/elastic/elasticsearch/issues/28867.
 * This code sets up coverage reporting manually for OpenSearch plugin tests. This is complicated because:
 *  1. The OpenSearch integTest Task doesn't implement Gradle's JavaForkOptions so we have to manually start the jacoco agent with the test JVM
 *  2. The cluster nodes are stopped using 'kill -9' which means jacoco can't dump it's execution output to a file on VM shutdown
 *  3. The Java Security Manager prevents JMX from writing execution output to the file.
 *  To workaround these we start the cluster with jmx enabled and then use Jacoco's JMX MBean to get the execution data before the
 *  cluster is stopped and dump it to a file. Luckily our current security policy seems to allow this. This will also probably
 *  break if there are multiple nodes in the integTestCluster. But for now... it sorta works.
apply plugin: 'jacoco'
// Get gradle to generate the required jvm agent arg for us using a dummy tasks of type Test. Unfortunately Elastic's
// testing tasks don't derive from Test so the jacoco plugin can't do this automatically.
task dummyTest(type: Test) {
    enabled = false
    workingDir = file("/") // Force absolute path to jacoco agent jar
    jacoco {
        destinationFile = file("${buildDir}/jacoco/test.exec")
        destinationFile.parentFile.mkdirs()
        jmx = true
task dummyIntegTest(type: Test) {
    enabled = false
    workingDir = file("/") // Force absolute path to jacoco agent jar
    jacoco {
        destinationFile = file("${buildDir}/jacoco/integTest.exec")
        destinationFile.parentFile.mkdirs()
        jmx = true
integTest.runner {
    systemProperty 'jacoco.dir', "${buildDir}/jacoco"
testClusters.integTest {
    jvmArgs " ${dummyIntegTest.jacoco.getAsJvmArg()}"
    systemProperty 'com.sun.management.jmxremote', "true"
    systemProperty 'com.sun.management.jmxremote.authenticate', "false"
    systemProperty 'com.sun.management.jmxremote.port', "7777"
    systemProperty 'com.sun.management.jmxremote.ssl', "false"
    systemProperty 'java.rmi.server.hostname', "127.0.0.1"
jacocoTestReport {
    dependsOn integTest, test
    executionData.from = [dummyTest.jacoco.destinationFile, dummyIntegTest.jacoco.destinationFile]
    sourceDirectories.from = sourceSets.main.java.sourceDirectories
    classDirectories.from = files(sourceSets.main.java.outputDir)
    reports {
        html.enabled = true // human readable
        csv.enabled = true
        xml.enabled = true // for coverlay
project.gradle.projectsEvaluated {
    jacocoTestReport.dependsOn integTest.runner
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