OpenSearch/gradle/code-coverage.gradle

/*
 * 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.
 */

apply plugin: 'jacoco'

repositories {
  mavenCentral()
}

allprojects {
  plugins.withId('jacoco') {
    // The default JaCoCo version in Gradle 6.6.1 is 0.8.5, but at least version 0.8.6 officially supports Java 14
    jacoco.toolVersion = '0.8.7'
  }
}

def codeCoverageReportTask = tasks.register("codeCoverageReport", JacocoReport) {
  description = 'Generates aggregate report from all subprojects.'
  executionData.setFrom fileTree(dir: '.', include: '**/build/jacoco/*.exec')
}

tasks.register("codeCoverageReportForUnitTest", JacocoReport) {
  description = 'Generates aggregate report from all subprojects for unit test.'
  executionData.setFrom fileTree(dir: '.', include: '**/build/jacoco/test.exec')
}

tasks.register("codeCoverageReportForIntegrationTest", JacocoReport) {
  description = 'Generates aggregate report from all subprojects for integration test.'
  // These kinds of tests are integration test, and the tests can be ran by Gradle tasks with the same name
  def integrationTestExecPathList = ['**/build/jacoco/integTest.exec',
                                     '**/build/jacoco/internalClusterTest.exec',
                                     '**/build/jacoco/javaRestTest.exec',
                                     '**/build/jacoco/yamlRestTest.exec' ]
  executionData.setFrom fileTree(dir: '.', include: integrationTestExecPathList)
}

tasks.withType(JacocoReport).configureEach {
  group = JavaBasePlugin.VERIFICATION_GROUP

  // Select projects with corresponding tests in order to run proper tests and select proper classes to generate the report
  def projectsWithJavaPlugin = subprojects.findAll { it.pluginManager.hasPlugin('java') }
  def projectsWithUnitTest = projectsWithJavaPlugin.findAll { it.tasks.findByName('test').enabled }
  def projectsWithIntegTest = projectsWithJavaPlugin.findAll {it.tasks.findByName('integTest')}
  def projectsWithInternalClusterTest = projectsWithJavaPlugin.findAll {it.tasks.findByName('internalClusterTest')}
  def projectsWithJavaRestTest = projectsWithJavaPlugin.findAll {it.tasks.findByName('javaRestTest')}
  def projectsWithYamlRestTest = projectsWithJavaPlugin.findAll {it.tasks.findByName('yamlRestTest')}
  def projectsWithIntegrationTest = projectsWithIntegTest + projectsWithInternalClusterTest + projectsWithJavaRestTest + projectsWithYamlRestTest
  def projectsWithTest = projectsWithUnitTest + projectsWithIntegrationTest

  def selectedProjects
  switch (name) {
    case "codeCoverageReportForUnitTest":
      dependsOn projectsWithUnitTest.test
      selectedProjects = projectsWithUnitTest
      break
    case "codeCoverageReportForIntegrationTest":
      dependsOn projectsWithIntegTest.integTest
      dependsOn projectsWithInternalClusterTest.internalClusterTest
      dependsOn projectsWithJavaRestTest.javaRestTest
      dependsOn projectsWithYamlRestTest.yamlRestTest
      selectedProjects = projectsWithIntegrationTest
      break
    default:
      dependsOn projectsWithUnitTest.test
      dependsOn projectsWithIntegTest.integTest
      dependsOn projectsWithInternalClusterTest.internalClusterTest
      dependsOn projectsWithJavaRestTest.javaRestTest
      dependsOn projectsWithYamlRestTest.yamlRestTest
      selectedProjects = projectsWithTest
      break
  }
  sourceDirectories.setFrom files(selectedProjects.sourceSets.main.allSource.srcDirs)
  classDirectories.setFrom files(selectedProjects.sourceSets.main.output)

  reports {
    xml.enabled true
    // Code coverage report in HTML format is on demand， since it takes up 100+MB of disk space.
    if (System.getProperty('tests.coverage.html_report')) {
      html.enabled true
    }
  }
}

if (System.getProperty("tests.coverage")) {
  // Attach code coverage report task to Gradle check task
  project.getTasks().named(JavaBasePlugin.CHECK_TASK_NAME).configure {
    dependsOn codeCoverageReportTask
  }
}